Re: Reconfiguring packages

[Michael Schwendt]

On Tue, 01 Jan 2013 20:03:33 -0500, Frank McCormick wrote:

> On 01/01/2013 04:26 PM, Michael Schwendt wrote:
> > On Tue, 01 Jan 2013 15:37:11 -0500, Frank McCormick wrote:
> >
> >>
> >>   Having come from Debian unstable, the switch to YUM from Aptitude
> >> is a bit disconcerting for me. So far I have managed but i have a question.
> >>
> >> In Debian, a package can be reconfigured (package such as console-setup)
> >> using dpkg-reconfigure. Can the same thing be accomplished
> >> in Fedora. I have 2 Fedora installations, 17 and 18.
> >
> > No. Something like dpkg-configure and debconf is not used by RPM packages.
> >
> 
>-YesI know that...I was asking if there is a Fedora equivalent.

No. As I wrote, _something like_ that is not used by RPM packages. RPM
packages are not supposed to be interactive during installation. And once
installed, you don't work on "packages" anymore, but with the files that
belong to the package. That is, either the package contains some sort of
configuration tool to run, or you edit config files that are marked as
such (so RPM can handle them in special ways during package updates).
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Re: Fedora hangs driving me nuts, in Windows it works without problems!

[valent.turko...@gmail.com]

Shit, frozen again after almost 5 days of uptime. I'm switching to debian
if Fedora 18 kernel turns out to be shit as F16 & F17 :(


On Fri, Dec 28, 2012 at 10:50 AM, valent.turko...@gmail.com <
valent.turko...@gmail.com> wrote:

> After latest updated my system finally has uptime more than 7 days! That
> was not possible before, it would freeze every 3-5 days.
>
> I looked at latest updates my guess is that latest kernel update is "to
> blame" for my system not freezing anymore:
> Dec 17 08:35:31 Installed: kernel-3.6.10-2.fc17.x86_64
>
> I finally have a work machine I can rely upon!
>
>
>
>
> On Tue, Nov 13, 2012 at 11:51 AM, valent.turko...@gmail.com <
> valent.turko...@gmail.com> wrote:
>
>> I had few days without issues but now it is again driving me nuts! But I
>> caught two crashes this time with abrt, one is kernel crash and other is
>> xorg crash:
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=876070
>> https://bugzilla.redhat.com/show_bug.cgi?id=853389
>>
>>
>>
>
>
> --
> follow me - www.twitter.com/valentt & http://kernelreloaded.blog385.com
> linux, anime, spirituality, wireless, scuba, linuxmce smart home, zwave
> ICQ: 2125241, Skype: valent.turkovic, MSN: valent.turko...@hotmail.com
>



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libsepol.policydb_write: Warning! policy version 19 cannot support permissive types, but some were defined

[carachi diego]

Hi
I'm trying to compile the Kernel for Fedora 17 64bit after some little
personalization.
I compiled and installed it , but now when the system start, it gives me
this error:

libsepol.policydb_write: Warning! policy version 19 cannot support
permissive types, but some were defined
libsepol.policydb_write: Discarding filename type transition rules
libsepol.policydb_write: Warning! policy version 19 cannot support
permissive types, but some were defined
libsepol.policydb_write: Discarding filename type transition rules

I searched on internet something to solve this problem but I didn't found
anything.
Can you help me?

Thank you a lot
bye

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Re: Boot with 1.44" Floppy, then net install from thumb drive?

[M de Luis]

Hello Michael. Thanks for your very welcome message and assistance.
 
Yep, it looks as though the only USB hardware that my bios understands during 
setup or boot is the USB floppy drive that came with the laptop. The bios' USB 
legacy setting does affect the ability to boot as you have correctly indicated, 
but only for the recognized floppy drive. I tried connecting other USB devices 
such as cameras and memory card readers, but nothing seems to interest the bios 
except the floppy drive. That being the case, then I'm not all that confident 
that booting from an external USB CD drive would achieve success. Happily there 
may be a simpler solution.
 
I had a quick look at the PXE server idea that you proposed too, Michael. This 
is a new concept for me, and I'll come back to it for a better appreciation 
when I get a quiet moment. I think it could be installed on an old FC10 system 
that I haven't run much for a while now, though I came to a point where the 
setup complexity began to look excessive, especially when contrast against 
temporarily shifting the laptop hard drive to a USB bootable machine for the 
installation, then hoping it remains operational when transferred back to the 
laptop. Well, both plans have their drawbacks, though I think a more 
satisfactory work-around may exist.
 
When I copied the Net installation iso of Fedora to my USB flash drive using 
the Fedora LiveUSB creator, I noticed that the pre-existing FAT32 filesystem on 
the thumb drive had been unaltered, and that DOS readable files for the live 
image and Network installation had been added in 4-new directories. Presumably 
some sort of boot loader, that is able to read the FAT32 filesystem files, was 
added to the boot sector region of the flash drive. As soon as I am able to 
recreate this mystery boot loader's installation process for a FAT32 formatted 
IDE drive, then the problem is licked. It's no effort to boot the laptop from a 
Windows98 rescue disk using the floppy drive, create a temporarily bootable DOS 
partition for the Net installation files, and then given the bios' legacy USB 
support will allow, merely copy the appropriate installation directories and 
files from the thumb drive to the hard disk. Install the boot loader, and away 
you go.
 
Okay, so who can tell me which bootloader is written into a thumb drive's boot 
sector, when the Fedora LiveUSB Creator tool prepares a USB flash drive using 
one of the installation iso images?
 
Very long winded, sorry. Thanks for the read, and for any contributions toward 
consideration and resolution of the matter. 
 
T.
 
 
 
 
 
 

From: Michael D. Setzer II 
To: M de Luis  
Sent: Wednesday, 2 January 2013 1:30 PM
Subject: Re: Boot with 1.44" Floppy, then net install from thumb drive?

A couple of questions.
Are you 100% that it will not boot from a flash?
Many bios require that a flash has to be plugged in to the system
to actually select it as a boot device.
Second, you may have to set an option for legacy USB as well.

On another issue, it might be worth seeing if you could get an
USB external CDROM and perhaps have it boot from that.

Don't think a floppy would be able to load any linux kernel. You
might be able to get a boot loader link syslinux or grub4dos, but
don't know what it would require to then pass control to a usb.

If it has network boot, you could setup a PXE server, but that
seems to be a lot of setup and requirements. Would suggest
looking into the bios options and usb cdrom.


On 1 Jan 2013 at 19:48, M de Luis wrote:

Date sent:    Tue, 1 Jan 2013 19:48:15 -0800 (PST)
From:    M de Luis 
Subject:    Boot with 1.44" Floppy, then net install from thumb drive?
To:    "users@lists.fedoraproject.org" 
Send reply to:    M de Luis ,
    Community support for Fedora users 
    
    

> My old NEC Versa P440 laptop computer has no working CD drive, and
> can't boot off a USB thumb drive. It does have a USB connected 1.44"
> floppy drive that came with a rescue disk, so I believe that it may be
> able to boot off that.   Okay then, how do I make a 1.44" Linux boot
> disk (boot/ root pair?) with enough USB capability to let me mount a
> USB thumb drive, one loaded with a Net based Fedora installation iso?
> Bit confused about how I might invoke the USB stick's Network based
> installation then, should I actually manage to get a boot a
> basic system up from floppies?   Please, just vague ideas are all
> that's really required. If there are any relevant links with
> which I could be very gratefully provisioned, then I'm sure to
> realize a solution, provided that one may be possible in this case.  
> T. :-)


+--+
  Michael D. Setzer II -  Computer Science Instructor
  Guam Community College  Computer Center
  mailto:mi...@kuentos.guam.net
  mailto:msetze...@gmail.com
  http:/

Re: Boot with 1.44" Floppy, then net install from thumb drive?

[T.C. Hollingsworth]

On 1/2/13, M de Luis  wrote:
> When I copied the Net installation iso of Fedora to my USB flash drive using
> the Fedora LiveUSB creator, I noticed that the pre-existing FAT32 filesystem
> on the thumb drive had been unaltered, and that DOS readable files for the
> live image and Network installation had been added in 4-new directories.
> Presumably some sort of boot loader, that is able to read the FAT32
> filesystem files, was added to the boot sector region of the flash drive. As
> soon as I am able to recreate this mystery boot loader's installation
> process for a FAT32 formatted IDE drive, then the problem is licked. It's no
> effort to boot the laptop from a Windows98 rescue disk using the floppy
> drive, create a temporarily bootable DOS partition for the Net installation
> files, and then given the bios' legacy USB support will allow, merely copy
> the appropriate installation directories and files from the thumb drive to
> the hard disk. Install the boot loader, and away you go.
>
> Okay, so who can tell me which bootloader is written into a thumb drive's
> boot sector, when the Fedora LiveUSB Creator tool prepares a USB flash drive
> using one of the installation iso images?

The bootloader is called SYSLINUX: http://www.syslinux.org/
IThey include DOS binaries.

Unfortunately, the copy of DOS included on the Windows 98 boot disk
does not have a USB mass storage driver (or any sort of USB driver for
that matter), though you might have some luck with this stuff:
http://www.bootdisk.com/usb.htm

That being said, the easiest solution IMHO is to plug its hard drive
into a different machine and do the install there.

--T.C.
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Re: blacklisting domains for yum?

[Joel Rees]

On Wed, Jan 2, 2013 at 10:31 AM, Ed Greshko  wrote:
> On 01/02/2013 08:19 AM, Joel Rees wrote:
>> On Tue, Jan 1, 2013 at 8:57 PM, Tim  wrote:
>>> Allegedly, on or about 29 December 2012, Joel Rees sent:
 I'm beginning to think the ISP has throttled me for yum.
>>> Could just be the time of the year, with more traffic than usual.
>> Definitely a possibility, particularly considering the timing. New
>> Year's morning here was impossible.
>>
>> But not for the whole net.
>>
>> Read in the newspapers there were some attacks in progress in the
>> Chinese segment around that time, so that might have also been part of
>> it.
>
> I live in Taiwan and work with folks in China.  No problems for me to connect 
> and transfer files.  Also, my wife watches streaming video from China and she 
> has had no problems during the times you were citing.  I avoided making any 
> comments at that time since this lists isn't a forum for political or country 
> bashing.  Even though they may not comment on this list, please note that 
> folks in countries being bashed do read this list and some of them may take 
> offense.
>

Thanks for the different point of view.

I should have been specific about the attacks being "cyber attacks" or
"internet attacks", but I didn't read the articles, just the
headlines, so, who knows?

Mea culpa. I'll look for the articles in the old newspaper pile if
you're interested in what was being said.

BTW, did you try pulling down updates on the 29th to 31st after about 11:00 pm?

All I know for sure is that yum on my netbook kept getting hung up
trying to read repositories on Chinese mirrors, so I installed
fastestmirror and blocked .cn domains, and that seemed to help.

It's the only box I have that runs Fedora right now.

apt-get on my Debian systems had no issues, neither was there any
particular problem getting to websites. Different set of mirrors. The
Fedora mirrors in China that seemed to hang me up were all university
mirrors. Possibilities that crossed my mind was that students were
celebrating on the 'net or that the government's filters were hard at
work against the universities. Saw the headlines the next day and
assumed there had been DOS and other attacks going on.

--
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Re: Reconfiguring packages

[Frank McCormick]

On 02/01/13 04:22 AM, Michael Schwendt wrote:

On Tue, 01 Jan 2013 20:03:33 -0500, Frank McCormick wrote:


On 01/01/2013 04:26 PM, Michael Schwendt wrote:

On Tue, 01 Jan 2013 15:37:11 -0500, Frank McCormick wrote:



   Having come from Debian unstable, the switch to YUM from Aptitude
is a bit disconcerting for me. So far I have managed but i have a question.

In Debian, a package can be reconfigured (package such as console-setup)
using dpkg-reconfigure. Can the same thing be accomplished
in Fedora. I have 2 Fedora installations, 17 and 18.


No. Something like dpkg-configure and debconf is not used by RPM packages.



-YesI know that...I was asking if there is a Fedora equivalent.


No. As I wrote, _something like_ that is not used by RPM packages. RPM
packages are not supposed to be interactive during installation. And once
installed, you don't work on "packages" anymore, but with the files that
belong to the package. That is, either the package contains some sort of
configuration tool to run, or you edit config files that are marked as
such (so RPM can handle them in special ways during package updates).




  OK, sorry misunderstood what you wrote (obviously). I am still 
feeling my way around Fedora. There are enough differences to make it

hard at times.


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Re: Fedora hangs driving me nuts, in Windows it works without problems!

[Heinz Diehl]

On 02.01.2013, valent.turko...@gmail.com wrote: 

> Shit, frozen again after almost 5 days of uptime. I'm switching to debian
> if Fedora 18 kernel turns out to be shit as F16 & F17 :(

How about just installing a plain vanilla 3.6.11 or 3.7.1 from
kernel.org?

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yum in the tarpits (was Re: blacklisting domains for yum?)

[Joel Rees]

Well, Ed. I guess I have to look closer to home for my problems with yum.

yum update, and the fedora/primary_db part goes just fine, maxes my
connection. Then updates/primary_db bogs down to averaging a kilobyte
per second. The mirror for both is riken this time, here in Japan,
FWIW. Should unblock the .cn domain to see if I can find out more.
HTTP access has no problems, even while yum is bogged down.

Do we have problems in the mirrors, or has my database for
updates/primary_db gone wonky?

Clean all doesn't help.

On Wed, Jan 2, 2013 at 11:07 PM, Joel Rees  wrote:
> On Wed, Jan 2, 2013 at 10:31 AM, Ed Greshko  wrote:
>> On 01/02/2013 08:19 AM, Joel Rees wrote:
>>> On Tue, Jan 1, 2013 at 8:57 PM, Tim  wrote:
 Allegedly, on or about 29 December 2012, Joel Rees sent:
> I'm beginning to think the ISP has throttled me for yum.
 Could just be the time of the year, with more traffic than usual.
>>> Definitely a possibility, particularly considering the timing. New
>>> Year's morning here was impossible.
>>>
>>> But not for the whole net.
>>>
>>> Read in the newspapers there were some attacks in progress in the
>>> Chinese segment around that time, so that might have also been part of
>>> it.
>>
>> I live in Taiwan and work with folks in China.  No problems for me to 
>> connect and transfer files.  Also, my wife watches streaming video from 
>> China and she has had no problems during the times you were citing.  I 
>> avoided making any comments at that time since this lists isn't a forum for 
>> political or country bashing.  Even though they may not comment on this 
>> list, please note that folks in countries being bashed do read this list and 
>> some of them may take offense.
>>
>
> Thanks for the different point of view.
>
> I should have been specific about the attacks being "cyber attacks" or
> "internet attacks", but I didn't read the articles, just the
> headlines, so, who knows?
>
> Mea culpa. I'll look for the articles in the old newspaper pile if
> you're interested in what was being said.
>
> BTW, did you try pulling down updates on the 29th to 31st after about 11:00 
> pm?
>
> All I know for sure is that yum on my netbook kept getting hung up
> trying to read repositories on Chinese mirrors, so I installed
> fastestmirror and blocked .cn domains, and that seemed to help.
>
> It's the only box I have that runs Fedora right now.
>
> apt-get on my Debian systems had no issues, neither was there any
> particular problem getting to websites. Different set of mirrors. The
> Fedora mirrors in China that seemed to hang me up were all university
> mirrors. Possibilities that crossed my mind was that students were
> celebrating on the 'net or that the government's filters were hard at
> work against the universities. Saw the headlines the next day and
> assumed there had been DOS and other attacks going on.
>
> --
> Joel Rees



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Re: yum in the tarpits (was Re: blacklisting domains for yum?)

[Tom Horsley]

On Wed, 2 Jan 2013 23:24:05 +0900
Joel Rees wrote:

> Do we have problems in the mirrors, or has my database for
> updates/primary_db gone wonky?

I once had big problems with one particular mirror, apparently
due to some router on the path between me and that mirror
(which is when I learned about fastest mirror being able
to blacklist things :-). I just kept blacklisting mirrors
till one worked well. (Since then I have gotten new versions
of fedora and not bothered to save the blacklist so whatever
problem I had before seems to be gone).
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Re: Reconfiguring packages

[Frank McCormick]

On 02/01/13 04:22 AM, Michael Schwendt wrote:

On Tue, 01 Jan 2013 20:03:33 -0500, Frank McCormick wrote:


On 01/01/2013 04:26 PM, Michael Schwendt wrote:

On Tue, 01 Jan 2013 15:37:11 -0500, Frank McCormick wrote:



   Having come from Debian unstable, the switch to YUM from Aptitude
is a bit disconcerting for me. So far I have managed but i have a question.

In Debian, a package can be reconfigured (package such as console-setup)
using dpkg-reconfigure. Can the same thing be accomplished
in Fedora. I have 2 Fedora installations, 17 and 18.


No. Something like dpkg-configure and debconf is not used by RPM packages.



-YesI know that...I was asking if there is a Fedora equivalent.


No. As I wrote, _something like_ that is not used by RPM packages. RPM
packages are not supposed to be interactive during installation. And once
installed, you don't work on "packages" anymore, but with the files that
belong to the package. That is, either the package contains some sort of
configuration tool to run, or you edit config files that are marked as
such (so RPM can handle them in special ways during package updates).




  OK, sorry misunderstood what you wrote (obviously). I am still 
feeling my way around Fedora. There are enough differences to make it

hard at times.


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Re: Fedora hangs driving me nuts, in Windows it works without problems!

[Ed Greshko]

On 01/02/2013 07:59 PM, valent.turko...@gmail.com wrote:
> Shit, frozen again after almost 5 days of uptime. I'm switching to debian if 
> Fedora 18 kernel turns out to be shit as F16 & F17 :(

Running F18 since my disk dying recently.  Thought it close enough since 
release should come on the 8th and updates-testing is currently disabled  
Didn't want to work through installing F17 only to upgrade.

[egreshko@meimei x]$ uptime
 23:26:12 up 6 days, 13:21,  5 users,  load average: 0.52, 0.45, 0.29
[egreshko@meimei x]$ uname -r
3.6.10-4.fc18.x86_64

No hangs, no problems. 

-- 
Programming today is a race between software engineers striving to build bigger 
and better idiot-proof programs, and the Universe trying to produce bigger and 
better idiots. So far, the Universe is winning. -- Rick Cook, The Wizardry 
Compiled
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Alacarte problem -

[Bob Goodwin - Zuni, Virginia, USA]

   I yum installed "alacarte" in this F-17/64 computer, the install
   apparently worked but it does not run, produces the following errors:

   [bobg@Box7 ~]$ alacarte
   Traceback (most recent call last):
  File "/usr/bin/alacarte", line 36, in 
main()
  File "/usr/bin/alacarte", line 33, in main
app.run()
  File
   "/usr/lib/python2.7/site-packages/Alacarte/MainWindow.py", line
   64, in run
self.loadMenus()
  File
   "/usr/lib/python2.7/site-packages/Alacarte/MainWindow.py", line
   203, in loadMenus
self.on_menu_tree_cursor_changed(menu_tree)
  File
   "/usr/lib/python2.7/site-packages/Alacarte/MainWindow.py", line
   354, in on_menu_tree_cursor_changed
self.loadItems(self.menu_store[menu_path][2], menu_path)
  File
   "/usr/lib/python2.7/site-packages/Alacarte/MainWindow.py", line
   217, in loadItems
for item, show in self.editor.getItems(menu):
  File
   "/usr/lib/python2.7/site-packages/Alacarte/MenuEditor.py", line
   145, in getItems
item = item_iter.get_separator()
   AttributeError: 'TreeIter' object has no attribute 'get_separator'

   This is an updated Fedora 17 install.

   Can anyone tell me what to do?

   Bob

   -- 


   http://www.qrz.com/db/W2BOD

   box7

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Re: Alacarte problem -

[Michael Schwendt]

On Wed, 02 Jan 2013 12:27:31 -0500, Bob Goodwin - Zuni, Virginia, USA wrote:

> 
> I yum installed "alacarte" in this F-17/64 computer, the install
> apparently worked but it does not run, produces the following errors:
> 
> [bobg@Box7 ~]$ alacarte
> Traceback (most recent call last):
>File "/usr/bin/alacarte", line 36, in 
>  main()
>File "/usr/bin/alacarte", line 33, in main
>  app.run()
>File
> "/usr/lib/python2.7/site-packages/Alacarte/MainWindow.py", line
> 64, in run
>  self.loadMenus()
>File
> "/usr/lib/python2.7/site-packages/Alacarte/MainWindow.py", line
> 203, in loadMenus
>  self.on_menu_tree_cursor_changed(menu_tree)
>File
> "/usr/lib/python2.7/site-packages/Alacarte/MainWindow.py", line
> 354, in on_menu_tree_cursor_changed
>  self.loadItems(self.menu_store[menu_path][2], menu_path)
>File
> "/usr/lib/python2.7/site-packages/Alacarte/MainWindow.py", line
> 217, in loadItems
>  for item, show in self.editor.getItems(menu):
>File
> "/usr/lib/python2.7/site-packages/Alacarte/MenuEditor.py", line
> 145, in getItems
>  item = item_iter.get_separator()
> AttributeError: 'TreeIter' object has no attribute 'get_separator'
> 
> This is an updated Fedora 17 install.
> 
> Can anyone tell me what to do?

Use convenient pages like this one
  http://bugz.fedoraproject.org/alacarte
as long as they still exist. ;)
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Re: Boot with 1.44" Floppy, then net install from thumb drive?

[Doug]

On 01/02/2013 08:49 AM, T.C. Hollingsworth wrote:

On 1/2/13, M de Luis  wrote:

When I copied the Net installation iso of Fedora to my USB flash drive using
the Fedora LiveUSB creator, I noticed that the pre-existing FAT32 filesystem
on the thumb drive had been unaltered, and that DOS readable files for the
live image and Network installation had been added in 4-new directories.
Presumably some sort of boot loader, that is able to read the FAT32
filesystem files, was added to the boot sector region of the flash drive. As
soon as I am able to recreate this mystery boot loader's installation
process for a FAT32 formatted IDE drive, then the problem is licked. It's no
effort to boot the laptop from a Windows98 rescue disk using the floppy
drive, create a temporarily bootable DOS partition for the Net installation
files, and then given the bios' legacy USB support will allow, merely copy
the appropriate installation directories and files from the thumb drive to
the hard disk. Install the boot loader, and away you go.

Okay, so who can tell me which bootloader is written into a thumb drive's
boot sector, when the Fedora LiveUSB Creator tool prepares a USB flash drive
using one of the installation iso images?

The bootloader is called SYSLINUX: http://www.syslinux.org/
IThey include DOS binaries.

Unfortunately, the copy of DOS included on the Windows 98 boot disk
does not have a USB mass storage driver (or any sort of USB driver for
that matter), though you might have some luck with this stuff:
http://www.bootdisk.com/usb.htm

That being said, the easiest solution IMHO is to plug its hard drive
into a different machine and do the install there.

--T.C.

That would probably *not* be a good idea, unless the other machine is
identical.  The install process customizes the system to fit the hardware
it finds--video, sound, hard drive controller, Ethernet chip, etc.
It's very likely that when you moved the drive back to your original
machine, nothing would work.

--doug
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Re: Boot with 1.44" Floppy, then net install from thumb drive?

[Reindl Harald]

Am 02.01.2013 19:08, schrieb Doug:
>> That being said, the easiest solution IMHO is to plug its hard drive
>> into a different machine and do the install there.
>>
>> --T.C.
> That would probably *not* be a good idea, unless the other machine is
> identical.  The install process customizes the system to fit the hardware
> it finds--video, sound, hard drive controller, Ethernet chip, etc.
> It's very likely that when you moved the drive back to your original
> machine, nothing would work

this is NOT windows!

as default dracut generates a gegenric initramfs as long
you do not configure it with hostonly="yes"

* there is no hard-wired video configuration
* there is no hard-waired sound configuration
* there is no hard-wired hard-drive controller
* there is ESPECIALLY no hard-wired ethernet

what do you imagine why a live-usb boots on nearly any hardware?
there is no "live-harwdare-support", the main component of a
live-media is the preconfigurd desktop etc.




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Re: Alacarte problem -

[Bob Goodwin - Zuni, Virginia, USA]

On 02/01/13 12:40, Michael Schwendt wrote:

> This is an updated Fedora 17 install.
>
> Can anyone tell me what to do?

Use convenient pages like this one
   http://bugz.fedoraproject.org/alacarte
as long as they still exist.;)


   I didn't find that with google, and even with your pointer it took
   some effort to find but:

   class MenuEditor(object):
def __init__(self):
self.applications = Menu('applications-gnome.menu')
self.applications.tree.connect('changed', self.menuChanged)

   Adding the "-gnome" in
   "/lib/python2.7/site-packages/Alacarte/MenuEditor.py" seems to have
   fixed things. At least alacarte starts the gui now.

   Thank you.

   Bob

   -- 


   http://www.qrz.com/db/W2BOD

   box7

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iptables is like alchemy

[Alan Evans]

This is really related to iptables, not I presume Fedora-specific. But I'm
really hoping that somebody here will be able to school me on iptables, so
I don't have to find and subscribe to some other list just to ask one
question.

I'm faced with the problem of needing to punch a hole in a firewall on our
portal server so that, in our case, ssh to port 20022 on external interface
of that server actually just connects to port 22 on another machine located
in the network on the internal interface. I hope I'm being clear.

I've tried many iterations of iptables rules to accomplish this. The
closest I've come is:

iptables -A PREROUTING -t nat -p tcp -s 0/0 --dport 20022 -j DNAT --to
192.168.0.35:22

And indeed connecting to port 20022 on portal just goes straight to port 22
on the other (192.168.0.35) machine. The problem is, as soon as I apply
this rule, DNS queries (portal is also a DNS server) to the external
interface stop working.

I've googled endlessly and found about a thousand variations by people that
are each supposed to solve a subtly different variation on what I'm trying
to do. Nothing I've tried does what I want without bad side effects like I
describe above.

-Alan
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Re: iptables is like alchemy

[Jorge Fábregas]

On 01/02/2013 07:54 PM, Alan Evans wrote:
> DNS queries (portal is also a DNS server) to the external
> interface stop working.

Hi,

Please elaborate more.  Why does 192.168.0.35 perform DNS queries
against the "external interface" of the firewall? Why not use the
internal ip?   If you manually perform dig @192.168.0.1 google.com  (I
assume that's your firewall ip) from 192.168.0.35, does it work?   Did
you create the corresponding MASQUERADE rule (under POSTROUTING) for the
egress traffic coming from 192.168.0.35?  I believe so , otherwise you
wouldn't have been able to connect from the outside to 20022.

Please post your rules if you want more detailed help.  I really don't
see any relationship with what you describe & DNS problems.

--
Jorge
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Re: iptables is like alchemy

[Gary Hodder]

On Wed, 2013-01-02 at 15:54 -0800, Alan Evans wrote:
> This is really related to iptables, not I presume Fedora-specific. But
> I'm really hoping that somebody here will be able to school me on
> iptables, so I don't have to find and subscribe to some other list
> just to ask one question.
> 
> 
> I'm faced with the problem of needing to punch a hole in a firewall on
> our portal server so that, in our case, ssh to port 20022 on external
> interface of that server actually just connects to port 22 on another
> machine located in the network on the internal interface. I hope I'm
> being clear.
> 
> 
> I've tried many iterations of iptables rules to accomplish this. The
> closest I've come is:
> 
> iptables -A PREROUTING -t nat -p tcp -s 0/0 --dport 20022 -j DNAT --to
> 192.168.0.35:22
> 
> 
> And indeed connecting to port 20022 on portal just goes straight to
> port 22 on the other (192.168.0.35) machine. The problem is, as soon
> as I apply this rule, DNS queries (portal is also a DNS server) to the
> external interface stop working.
> 
> 
> I've googled endlessly and found about a thousand variations by people
> that are each supposed to solve a subtly different variation on what
> I'm trying to do. Nothing I've tried does what I want without bad side
> effects like I describe above.
> 
> 
> -Alan
> 
Hi Alan,

try this
ppp0=Internet connection
eth0=local area network connection
This will forward port 22 on the Internet to machine 192.168.0.2 port 22
on local network.

iptables -A FORWARD -p tcp -i ppp0 -o eth0 -d 192.168.0.2 --dport 22 -j
ACCEPT

iptables -t nat -A PREROUTING -p tcp -i ppp0 --dport 22 -j DNAT
--to-destination 192.168.0.2:22

Gary.


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Re: iptables is like alchemy

[Alan Evans]

On Wed, Jan 2, 2013 at 6:13 PM, Jorge Fábregas wrote:

>
> Please elaborate more.


I'll try.


> Why does 192.168.0.35 perform DNS queries
> against the "external interface" of the firewall? Why not use the
> internal ip?


It doesn't.

I'll try to be more specific:

There are at least four machines in this picture.

"Portal" is our company's gateway between the wide internet and the local
LAN. It handles a number of services and also runs bind.

"Machine35" is a server on the local LAN.

"Server2" is another server (not yet mentioned) which sits parallel to
portal and is connected only to the internet. Server2 has portal as it's
only nameserver, so accessing server2 by name is only possible if portal is
online and running bind.

Now the task I've been unhappily given is to allow ssh access to 35
directly from some other machine accessing from the internet. Call this
machine "Developer".

The closest I've come to doing this is the rule that I posted originally.
After executing that rule and no other, Developer is able to initiate a ssh
connection to portal:20022 and directly log in to machine35. Beautiful.
Except now, nobody can access server2 because the DNS query times out. That
and the boss complains about IMAP access to portal from the outside stops
working, which I figure is the same problem.

Anyway, the rule I posted is the only rule in use here. I have tried other
iterations that did involve a MASQUERADE rule, but they didn't work either.
Like I said, I've been scouring google to solve this for a long time.

So my question is sort of multi-faceted:

If the rule I posted can't work without an attendant MASQUERADE rule then
why did it work? I'm certain it was the only rule in effect (aside from the
normal rules always effective) when I tested connectivity.

Why did my rule cause other services to be blocked? I don't see anything
about it that should have had that effect.

Finally, what *should* I do to make this work?

If you manually perform dig @192.168.0.1 google.com  (I
> assume that's your firewall ip) from 192.168.0.35, does it work?   Did
> you create the corresponding MASQUERADE rule (under POSTROUTING) for the
> egress traffic coming from 192.168.0.35?  I believe so , otherwise you
> wouldn't have been able to connect from the outside to 20022.
>
> Please post your rules if you want more detailed help.  I really don't
> see any relationship with what you describe & DNS problems.
>

Neither do I, and that's a big part of my problem.

Thanks for being patient with my ignorance.

-Alan
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Re: iptables is like alchemy

[Alan Evans]

On Wed, Jan 2, 2013 at 7:50 PM, Gary Hodder wrote:

try this
> ppp0=Internet connection
> eth0=local area network connection
> This will forward port 22 on the Internet to machine 192.168.0.2 port 22
> on local network.
>
> iptables -A FORWARD -p tcp -i ppp0 -o eth0 -d 192.168.0.2 --dport 22 -j
> ACCEPT
>
> iptables -t nat -A PREROUTING -p tcp -i ppp0 --dport 22 -j DNAT
> --to-destination 192.168.0.2:22
>
>
I'll try this tomorrow when I get into work. But at first look it seems
awfully familiar, like it's something that I've already tried. Thanks,
though. At this point I'll try whatever somebody thinks might work.

-Alan
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