Re: Block connection in firewall -

2016-02-13 Thread Tim
On Sat, 2016-02-13 at 08:33 -0600, Robert Nichols wrote: > The lack of response means, "There's a machine here that is trying > not to be seen." If there were really no machine at that address, > the upstream router would have sent back an ICMP "No route to host" > response. Yes, I do DROP most o

Re: Block connection in firewall -

2016-02-13 Thread Robert Nichols
On 02/12/2016 03:34 PM, Rick Stevens wrote: On 02/12/2016 01:01 PM, Joe Zeff wrote: On 02/12/2016 12:47 PM, Bob Goodwin wrote: Ok, I'll try adding that. Joe brings up the need to keep a route open to NTP, that presents another concern. Either that, or set up a local NTP server on a box that's

Re: Block connection in firewall -

2016-02-12 Thread Ed Greshko
On 02/13/16 11:44, jd1008 wrote: > > > On 02/12/2016 08:05 PM, Joe Zeff wrote: >> On 02/12/2016 06:42 PM, jd1008 wrote: >>> Interesting. I did not see a link on the page for doing port scan. >> >> When you go to that page and click on the button to Proceed, you get to >> https://www.grc.com/x/ne.

Re: Block connection in firewall -

2016-02-12 Thread jd1008
On 02/12/2016 08:45 PM, Joe Zeff wrote: On 02/12/2016 07:44 PM, jd1008 wrote: All I am getting from that page is: *Browser Reload Suppressed Interesting. Do you have any special security settings, or addons? All I can say is, it works just fine for me. Yes. I have noscript enabled. So, I

Re: Block connection in firewall -

2016-02-12 Thread Joe Zeff
On 02/12/2016 07:44 PM, jd1008 wrote: All I am getting from that page is: *Browser Reload Suppressed Interesting. Do you have any special security settings, or addons? All I can say is, it works just fine for me. -- users mailing list users@lists.fedoraproject.org To unsubscribe or change s

Re: Block connection in firewall -

2016-02-12 Thread jd1008
On 02/12/2016 08:05 PM, Joe Zeff wrote: On 02/12/2016 06:42 PM, jd1008 wrote: Interesting. I did not see a link on the page for doing port scan. When you go to that page and click on the button to Proceed, you get to https://www.grc.com/x/ne.dll?rh1dkyd2 and if you scroll down past the UPn

Re: Block connection in firewall -

2016-02-12 Thread Joe Zeff
On 02/12/2016 06:42 PM, jd1008 wrote: Interesting. I did not see a link on the page for doing port scan. When you go to that page and click on the button to Proceed, you get to https://www.grc.com/x/ne.dll?rh1dkyd2 and if you scroll down past the UPnP Exposure Test, you'll see where you can h

Re: Block connection in firewall -

2016-02-12 Thread jd1008
On 02/12/2016 07:35 PM, Joe Zeff wrote: On 02/12/2016 06:16 PM, jd1008 wrote: The website Joe mentions only tested the UPNP of the router I am connected to. Of course the test failed to make use of upnp because the router blocks those requests coming from the internet. You can also have it d

Re: Block connection in firewall -

2016-02-12 Thread Joe Zeff
On 02/12/2016 06:16 PM, jd1008 wrote: The website Joe mentions only tested the UPNP of the router I am connected to. Of course the test failed to make use of upnp because the router blocks those requests coming from the internet. You can also have it do a port scan, to see which, if any ports r

Re: Block connection in firewall -

2016-02-12 Thread jd1008
On 02/12/2016 06:13 PM, Bob Goodwin wrote: On 02/12/16 19:12, Joe Zeff wrote: If you want to find out just how secure you are, here's a good place to test your firewall: https://www.grc.com/x/ne.dll?bh0bkyd2 -- . That seems to indicate that my firewall is working well, dunno how much con

Re: Block connection in firewall -

2016-02-12 Thread Tim
Allegedly, on or about 12 February 2016, Rick Stevens sent: > Carrying that further, set up the firewall to block all incoming > traffic initially and use "DROP" as the target--NOT "REJECT". The > reason to use DROP is that "REJECT" actually returns a response to a > probe which essentially says "Y

Re: Block connection in firewall -

2016-02-12 Thread Bob Goodwin
On 02/12/16 19:12, Joe Zeff wrote: If you want to find out just how secure you are, here's a good place to test your firewall: https://www.grc.com/x/ne.dll?bh0bkyd2 -- . That seems to indicate that my firewall is working well, dunno how much confidence I can have in it? It's been severa

Re: Block connection in firewall -

2016-02-12 Thread Joe Zeff
On 02/12/2016 01:34 PM, Rick Stevens wrote: Carrying that further, set up the firewall to block all incoming traffic initially and use "DROP" as the target--NOT "REJECT". The reason to use DROP is that "REJECT" actually returns a response to a probe which essentially says "Yeah, there's a machine

Re: Block connection in firewall -

2016-02-12 Thread Bob Goodwin
On 02/12/16 16:36, Joe Zeff wrote: Remember, this doesn't need to be a dedicated box. All you need to do is set it up on any box that's always up and has Internet access. . The ones that are always up are the two I want to protect. But I will consider that. -- Bob Goodwin - Zuni, Virgin

Re: Block connection in firewall -

2016-02-12 Thread Joe Zeff
On 02/12/2016 01:24 PM, Bob Goodwin wrote: This system is already grown too complex over the years, I would like to avoid adding a local NTP server to it although I have considered trying to use a GPS time source ... Hmm, another project. Remember, this doesn't need to be a dedicated box. All

Re: Block connection in firewall -

2016-02-12 Thread Rick Stevens
On 02/12/2016 01:01 PM, Joe Zeff wrote: On 02/12/2016 12:47 PM, Bob Goodwin wrote: Ok, I'll try adding that. Joe brings up the need to keep a route open to NTP, that presents another concern. Either that, or set up a local NTP server on a box that's not blocked. Let that box sync to the rest o

Re: Block connection in firewall -

2016-02-12 Thread Bob Goodwin
On 02/12/16 16:01, Joe Zeff wrote: Ok, I'll try adding that. Joe brings up the need to keep a route open to NTP, that presents another concern. Either that, or set up a local NTP server on a box that's not blocked. Let that box sync to the rest of the net and have your LAN all sync to it.

Re: Block connection in firewall -

2016-02-12 Thread Bob Goodwin
On 02/12/16 16:12, Gordon Messmer wrote: It works to prevent internet access from that ip. However I can still ping 8.8.8.8 In a very general sense, DROP may be preferred to REJECT when you are dealing with protocols other than TCP or UDP. For TCP, a firewall can reject a packet by sendi

Re: Block connection in firewall -

2016-02-12 Thread Bob Goodwin
On 02/12/16 15:53, Rick Stevens wrote: The objective is to protect my servers which I want connected to the LAN but not the internet. The firewall is in the router, openwrt, I want to set up. As I said in another post, my guess is that it affects TCP and UDP. The rule you commented out woul

Re: Block connection in firewall -

2016-02-12 Thread Gordon Messmer
On 02/12/2016 11:10 AM, Bob Goodwin wrote: It works to prevent internet access from that ip. However I can still ping 8.8.8.8 In a very general sense, DROP may be preferred to REJECT when you are dealing with protocols other than TCP or UDP. For TCP, a firewall can reject a packet by sending

Re: Block connection in firewall -

2016-02-12 Thread Joe Zeff
On 02/12/2016 12:47 PM, Bob Goodwin wrote: Ok, I'll try adding that. Joe brings up the need to keep a route open to NTP, that presents another concern. Either that, or set up a local NTP server on a box that's not blocked. Let that box sync to the rest of the net and have your LAN all sync to

Re: Block connection in firewall -

2016-02-12 Thread Joe Zeff
On 02/12/2016 12:45 PM, Bob Goodwin wrote: I hadn't thought of that Joe, probably only one of the things I didn't consider. With other routers it was just another GUI menu item, I entered the ip's and left it at that hoping for the best. Here I'm being forced to look at what I'm doing, not a ba

Re: Block connection in firewall -

2016-02-12 Thread Rick Stevens
On 02/12/2016 12:28 PM, Bob Goodwin wrote: On 02/12/16 15:10, Rick Stevens wrote: Not sure which firewall you're using. Judging by your description of its behavior, the odds are that the (unless otherwise specified) default protocol the rules affect is TCP. If that's the case, yes, your rules w

Re: Block connection in firewall -

2016-02-12 Thread Bob Goodwin
On 02/12/16 15:30, Rick Stevens wrote: There's a whole lot of protocols that come under the "IP" umbrella. Dump out the content of /etc/protocols if you want to see a (fairly complete, but not exhaustive) list of what's out there. After more digging around, it appears you're using firewal

Re: Block connection in firewall -

2016-02-12 Thread Bob Goodwin
On 02/12/16 15:39, Joe Zeff wrote: On 02/12/2016 12:28 PM, Bob Goodwin wrote: The objective is to protect my servers which I want connected to the LAN but not the internet. The firewall is in the router, openwrt, I want to set up. I haven't had to play with router firewalls in several year

Re: Block connection in firewall -

2016-02-12 Thread Joe Zeff
On 02/12/2016 12:28 PM, Bob Goodwin wrote: The objective is to protect my servers which I want connected to the LAN but not the internet. The firewall is in the router, openwrt, I want to set up. I haven't had to play with router firewalls in several years, and that never included this type of

Re: Block connection in firewall -

2016-02-12 Thread Rick Stevens
On 02/12/2016 12:10 PM, Rick Stevens wrote: On 02/12/2016 11:10 AM, Bob Goodwin wrote: I have been messing with a firewall file and added the following: config rule option src lan option src_ip 192.168.1.7 option dest wan option ta

Re: Block connection in firewall -

2016-02-12 Thread Bob Goodwin
On 02/12/16 15:10, Rick Stevens wrote: Not sure which firewall you're using. Judging by your description of its behavior, the odds are that the (unless otherwise specified) default protocol the rules affect is TCP. If that's the case, yes, your rules would prevent TCP-based activity (telnet,

Re: Block connection in firewall -

2016-02-12 Thread Rick Stevens
On 02/12/2016 11:10 AM, Bob Goodwin wrote: I have been messing with a firewall file and added the following: config rule option src lan option src_ip 192.168.1.7 option dest wan option target REJECT It works to prevent internet a

Block connection in firewall -

2016-02-12 Thread Bob Goodwin
I have been messing with a firewall file and added the following: config rule option src lan option src_ip 192.168.1.7 option dest wan option target REJECT It works to prevent internet access from that ip. However I can still ping