[ubuntu-uk] Squid proxy box with serious IPv6 DNS problem...

[Alan Bell]

I think from the description the squid thing is actually a red herring. 
(to mix a fishy metaphore). It sounds like your proxy server is not 
reliably resolving DNS when using IPV6. You will probably see this 
problem if you run firefox on the server.
https://bugs.launchpad.net/ubuntu/+source/netcfg/+bug/24828

not sure how you turned off IPV6, one way is to edit
/ /etc/modprobe.d/aliases
and edit it to have this line:
/alias net-pf-10 off ipv6

a better solution would be to fix the actual problem, one way might be 
to point your proxy at openDNS which works fine with v6. I suspect the 
DHCP server is pointing your box at a bad router for DNS queries.

Alan.

LeeGroups wrote:
> Chaps...
>
> Over the last couple of days I've been trying to build a proxy box for a 
> load of Windows PCs, using Squid on Ubuntu server 8.04.
> I've had a few problems with it due to the wild/wacky filtered internet 
> connection we have there, but now I've hit a massive brick wall...
>
> Using an upstream proxy config Apt can get out to the internet fine, 
> download and update the OS.
>
> However, Squid can't resolve any DNS loopups... it just fails a few 
> minutes after loading.
>
> Doing a wget of a known file like the Google index page also fails with 
> a unresolved DNS error.
>
> However, (after much much much reading) using the -4 option of wget, to 
> force it to use IPv4, it works fine, resolves the Google address and 
> downloads the index page and saves it.
>
> I've blacklisted the IPv6 service, but wget (and Squid) still doesn't 
> work without the -4 option, so I guess bits of IPv6 are still hiding 
> there somewhere....
>
> My question is - How do I fix this bloomin' thing?  I've been googling 
> for hours with only the -4 option to show for it... and I really need to 
> get this this working for Friday afternoon...  Otherwise bad Windows 
> things may happen...
>
> Cheers,
> Lee
>
>