Hello Craig and all,

Thanks Craig for your suggestions and help.

Sorry about the length of this post. I've supplied the command outputs which 
are a bit long in some cases.

Here is the full output of the error. I did abbreviate earlier because it's 
long. I was after inxi which has tree
as a dependency.
----------------start error message------------------
[root@owl /etc/apt]# apt-get install inxi
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  hddtemp libglew2.1 lm-sensors mesa-utils tree
Suggested packages:
  libcpanel-json-xs-perl | libjson-xs-perl libxml-dumper-perl glew-utils 
fancontrol read-edid i2c-tools
The following NEW packages will be installed:
  hddtemp inxi libglew2.1 lm-sensors mesa-utils tree
0 upgraded, 6 newly installed, 0 to remove and 0 not upgraded.
Need to get 731 kB of archives.
After this operation, 2,625 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Err:1 http://ftp.au.debian.org/debian bullseye/main amd64 hddtemp amd64 
0.3-beta15-53
  Connection failed [IP: 2001:388:1034:2900::25 80]
Err:2 http://ftp.au.debian.org/debian bullseye/main amd64 inxi all 3.1.08-1-1
  Could not connect to ftp.au.debian.org:80 (150.203.164.37), connection timed 
out Could not connect to ftp.au.debian.org:80 (2001:388:1034:2900::25), 
connection timed out [IP: 2001:388:1034:2900::25 80]
Err:3 http://ftp.au.debian.org/debian bullseye/main amd64 libglew2.1 amd64 
2.1.0-4+b1
  Unable to connect to ftp.au.debian.org:http: [IP: 2001:388:1034:2900::25 80]
Err:4 http://ftp.au.debian.org/debian bullseye/main amd64 lm-sensors amd64 
1:3.6.0-2
  Unable to connect to ftp.au.debian.org:http: [IP: 2001:388:1034:2900::25 80]
Err:5 http://ftp.au.debian.org/debian bullseye/main amd64 mesa-utils amd64 
8.4.0-1+b1
  Unable to connect to ftp.au.debian.org:http: [IP: 2001:388:1034:2900::25 80]
Err:6 http://ftp.au.debian.org/debian bullseye/main amd64 tree amd64 1.8.0-1+b1
  Unable to connect to ftp.au.debian.org:http: [IP: 2001:388:1034:2900::25 80]
E: Failed to fetch 
http://ftp.au.debian.org/debian/pool/main/h/hddtemp/hddtemp_0.3-beta15-53_amd64.deb
  Connection failed [IP: 2001:388:1034:2900::25 80]
E: Failed to fetch 
http://ftp.au.debian.org/debian/pool/main/i/inxi/inxi_3.1.08-1-1_all.deb  Could 
not connect to ftp.au.debian.org:80 (150.203.164.37), connection timed out 
Could not connect to ftp.au.debian.org:80 (2001:388:1034:2900::25), connection 
timed out [IP: 2001:388:1034:2900::25 80]
E: Failed to fetch 
http://ftp.au.debian.org/debian/pool/main/g/glew/libglew2.1_2.1.0-4+b1_amd64.deb
  Unable to connect to ftp.au.debian.org:http: [IP: 2001:388:1034:2900::25 80]
E: Failed to fetch 
http://ftp.au.debian.org/debian/pool/main/l/lm-sensors/lm-sensors_3.6.0-2_amd64.deb
  Unable to connect to ftp.au.debian.org:http: [IP: 2001:388:1034:2900::25 80]
E: Failed to fetch 
http://ftp.au.debian.org/debian/pool/main/m/mesa-demos/mesa-utils_8.4.0-1+b1_amd64.deb
  Unable to connect to ftp.au.debian.org:http: [IP: 2001:388:1034:2900::25 80]
E: Failed to fetch 
http://ftp.au.debian.org/debian/pool/main/t/tree/tree_1.8.0-1+b1_amd64.deb  
Unable to connect to ftp.au.debian.org:http: [IP: 2001:388:1034:2900::25 80]
E: Unable to fetch some archives, maybe run apt-get update or try with 
--fix-missing?
----------------------end error message-------------------

Firefox does not connect to http://ftp.au.debian.org/ . It just leaves the 
screen blank with a moving dot on the tab at the top of the page.

Firefox does connect to http://ftp.nz.debian.org/.

Using host au debian is not found:

[ben@owl ~]$ host ftp.au.debian.org/
Host ftp.au.debian.org/ not found: 3(NXDOMAIN)
[ben@owl ~]$ host http://ftp.au.debian.org
Host http://ftp.au.debian.org not found: 3(NXDOMAIN)

The nz debian is found.
[ben@owl ~]$ host ftp.nz.debian.org

ftp.nz.debian.org is an alias for mirror.fsmg.org.nz.
mirror.fsmg.org.nz has address 163.7.134.112
mirror.fsmg.org.nz has IPv6 address 2404:138:4000::


When I changed sources.list to ftp.nz.debian.org, and tried installing inxi, 
the error was:

[root@owl /etc/apt]# apt-get install inxi
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package inxi

My /etc/network/interfaces:

# The loopback network interface
auto lo
iface lo inet loopback
#ben amend
allow-hotplug enp3s0
iface enp3s0 inet dhcp
iface enp3s0 inet6 auto

Testing with the Force config. I used the cowsay program as the test:

[root@owl Downloads]# apt-get -o Acquire::ForceIPv4=true update
Hit:1 http://ftp.au.debian.org/debian bullseye InRelease
Hit:2 http://security.debian.org/debian-security bullseye-security InRelease
Reading package lists... Done

[root@owl Downloads]# apt-get -o Acquire::ForceIPv4=true install cowsay
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Suggested packages:
  filters cowsay-off
The following NEW packages will be installed:
  cowsay
0 upgraded, 1 newly installed, 0 to remove and 67 not upgraded.
Need to get 0 B/21.4 kB of archives.
After this operation, 94.2 kB of additional disk space will be used.
Selecting previously unselected package cowsay.
(Reading database ... 141859 files and directories currently installed.)
Preparing to unpack .../cowsay_3.03+dfsg2-8_all.deb ...
Unpacking cowsay (3.03+dfsg2-8) ...
Setting up cowsay (3.03+dfsg2-8) ...
Processing triggers for man-db (2.9.3-2) ...

I purged cowsay and then tried the nz mirror but it failed:

[root@owl /home/ben/Downloads]# apt-get -o Acquire::ForceIPv4=true install 
cowsay
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package cowsay

I added 8.8.8.8 to /etc/resolv.conf, but it made no difference. I'm using a 
Telstra smart modem:

[root@owl /etc]# cat resolv.conf 
domain gateway
search gateway
nameserver 192.168.0.1


Traceroute results:

[root@owl /etc]# traceroute ftp.au.debian.org
traceroute to ftp.au.debian.org (150.203.164.37), 30 hops max, 60 byte packets
 1  mymodem (192.168.0.1)  0.357 ms  0.415 ms  0.551 ms
 2  gateway.nb10.sydney.asp.telstra.net (58.162.26.74)  18.963 ms  19.616 ms  
19.601 ms
 3  ae10.ken-ice301.sydney.telstra.net (203.50.61.81)  19.682 ms  19.666 ms 
ae20-20.chw-ice301.sydney.telstra.net (203.50.61.66)  21.422 ms
 4  bundle-ether25.ken-core10.sydney.telstra.net (203.50.61.80)  22.631 ms 
ae20-20.ken-ice301.sydney.telstra.net (203.50.61.67)  22.166 ms 
bundle-ether25.ken-core10.sydney.telstra.net (203.50.61.80)  22.159 ms
 5  bundle-ether1.ken-edge903.sydney.telstra.net (203.50.11.173)  22.224 ms 
bundle-ether1.chw-edge903.sydney.telstra.net (203.50.11.177)  22.221 ms 
bundle-ether1.ken-edge903.sydney.telstra.net (203.50.11.173)  26.174 ms
 6  bundle-ether2.ken-edge903.sydney.telstra.net (203.50.11.174)  26.190 ms 
aar3533567.lnk.telstra.net (139.130.0.78)  22.049 ms  22.045 ms
 7  et-0-3-0.pe1.actn.act.aarnet.net.au (113.197.15.11)  26.960 ms  22.122 ms  
23.241 ms
 8  et-0-3-0.pe1.actn.act.aarnet.net.au (113.197.15.11)  23.204 ms 138.44.161.3 
(138.44.161.3)  23.243 ms et-0-3-0.pe1.actn.act.aarnet.net.au (113.197.15.11)  
23.266 ms
 9  138.44.161.3 (138.44.161.3)  22.888 ms  22.751 ms  22.733 ms
10  core-te-1-1-4.anu.edu.au (150.203.201.5)  22.644 ms  22.724 ms  23.481 ms
11  vlan-2100-palo.anu.edu.au (150.203.201.33)  24.957 ms  27.060 ms 
linux.anu.edu.au (150.203.164.37)  26.719 ms !X
[root@owl /etc]# traceroute ftp.nz.debian.org
traceroute to ftp.nz.debian.org (163.7.134.112), 30 hops max, 60 byte packets
 1  mymodem (192.168.0.1)  2.635 ms  2.930 ms  3.021 ms
 2  gateway.nb10.sydney.asp.telstra.net (58.162.26.74)  21.866 ms  21.867 ms  
21.886 ms
 3  ae10.ken-ice301.sydney.telstra.net (203.50.61.81)  21.956 ms  22.473 ms  
22.685 ms
 4  bundle-ether25.chw-core10.sydney.telstra.net (203.50.61.64)  23.341 ms 
bundle-ether25.ken-core10.sydney.telstra.net (203.50.61.80)  24.386 ms 
bundle-ether25.chw-core10.sydney.telstra.net (203.50.61.64)  23.247 ms
 5  bundle-ether1.chw-edge903.sydney.telstra.net (203.50.11.177)  23.176 ms 
bundle-ether1.ken-edge903.sydney.telstra.net (203.50.11.173)  23.045 ms  27.094 
ms
 6  cen3361629.lnk.telstra.net (203.54.217.110)  27.110 ms  20.918 ms  20.733 ms
 7  * * *
 8  113.29.115.254 (113.29.115.254)  20.359 ms  19.552 ms  19.495 ms
 9  ae0-500.grt.and05-mdr.reannz.co.nz (210.7.33.236)  44.972 ms  47.031 ms  
45.168 ms
10  163.7.134.120 (163.7.134.120)  47.039 ms  46.417 ms  46.330 ms
11  * * *
12  * * *
13  * * *
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *

Whilst going through the process that was suggested and running the commands 
above, I returned to Firefox, and it now brings up http://ftp.au.debian.org/. 
The only extra thing that I have done which is not described above is to return 
the /etc/hosts file that I use to its original from the Pollock hosts file.

-------start /etc/hosts-------
127.0.0.1       localhost
127.0.1.1       owl

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
-------end /etc/hosts---------

I have now written the /etc/apt//apt.conf.d/zzz-ipv4.conf with the ipv4 Force 
config as suggested.

The nz mirror still fails. I would really like to be able to change mirrors if 
I need to in the future.

Is there anything in the results that looks like it can help?

I'm wondering if this is an intermittent error of DNS, and if so, what I could 
do about it.

Thanks again.

ben
  
  [email protected]

On Sat, Nov 7, 2020, at 2:26 PM, Craig Sanders via luv-main wrote:
> On Sat, Nov 07, 2020 at 12:01:54PM +1100, [email protected] wrote:
> > In my /etc/apt/sources.list I have been using the following mirror:
> > deb http://ftp.au.debian.org/debian/ bullseye main non-free contrib
> >
> > The last few days it's returning error messages such as the following:
> >
> > E: Failed to fetch 
> > http://ftp.au.debian.org/debian/pool/main/t/tree/tree_1.8.0-1+b1_amd64.deb  
> > Unable to connect to ftp.au.debian.org:http:
> > E: Unable to fetch some archives, maybe run apt-get update or try with 
> > --fix-missing?
> >
> > Running the suggested apt-get update also fails, and with -f does too of 
> > course.
> 
> Can you show the full output of "apt-get update"?  or "apt install tree"?
> Without details, the best anyone can do is guess....so here's some diagnostic
> tests for you to try and a guess:
> 
> 
> Can you connect to either http://ftp.au.debian.org/ or
> http://ftp.nz.debian.org/ with a web browser?  I had no problems connecting to
> either site with firefox, with both sites being very fast and responsive.
> 
> what happens if you try to traceroute to either site?
> 
> 
> 
> I'm suspecting there's something weird going on with your DNS resolution - or
> perhaps your system is configured to use IPv6 in preference to IP4v addresses
> or something (both sites have both IPv4 A records and IPv6 AAAA records).
> 
> $ host ftp.au.debian.org
> ftp.au.debian.org is an alias for mirror.linux.org.au.
> mirror.linux.org.au has address 150.203.164.37
> mirror.linux.org.au has IPv6 address 2001:388:1034:2900::25
> 
> $ host ftp.nz.debian.org
> ftp.nz.debian.org is an alias for mirror.fsmg.org.nz.
> mirror.fsmg.org.nz has address 163.7.134.112
> mirror.fsmg.org.nz has IPv6 address 2404:138:4000::
> 
> You can test this with:
> 
>     apt-get -o Acquire::ForceIPv4=true update
>     apt-get -o Acquire::ForceIPv4=true install tree
> 
> If they work, make it permanent by adding the following to /etc/apt/apt.conf
> (or to a file in the directory /etc/apt/conf.d/, give it a name like
> zzz-ipv4.conf to make sure the filename comes last in the sort order)
> 
>     Acquire::ForceIPv4 "true";
> 
> and make sure there isn't any line with 'Acquire::ForceIPv6 "true";' in
> /etc/apt/apt.conf or any files in /etc/apt/apt.conf.d/
> 
>     grep -ir ForceIPv6 /etc/apt/apt.conf /etc/apt/apt.conf.d/
> 
> 
> > I'm writing to ask if the problem I'm having is common and there's a problem
> > like congestion with the au mirror,
> 
> Nope, not common.  It's almost certainly some weird problem on your end,
> either a misconfiguration or something weird your ISP is doing.
> 
> > and also how to change mirrors in the sources.list so that I can install and
> > update.
> 
> the way you changed it should work.
> 
> for more details on the sources.list file format, run "man sources.list".
> 
> craig
> 
> --
> craig sanders <[email protected]>
> _______________________________________________
> luv-main mailing list
> [email protected]
> https://lists.luv.asn.au/cgi-bin/mailman/listinfo/luv-main
>
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