Help with DNS hell

[Andre Costa]

Hi,

I'm having a *real* hard time trying to use F10 due to DNS problems [
https://bugzilla.redhat.com/show_bug.cgi?id=459756] (not to mention
NetworkManager being unable to manage static IPs and s-c-n screwing network
mask configuration[*]). As if that was enough, I can't seem to be able to
configure a local DNS cache using dnsmasq, for some unknown reason (I've
tried lots of workarounds trying to get me out of this DNS hell, so it's
probably partially -- or totally -- my fault).

[*] there are so many network configuration problems with F10 that it almost
seems it's been designed for offline use... ;-)

So, I'll sum it all up here, hoping someone can help me.

I disabled ipv6 by putting

alias ipv6 off
alias net-pf-10 off

on my modprobe.conf

I installed 'named' so that I could have a IPv4-only local DNS cache, but
its configuration is not as easy as dnsmasq's, so I installed this one (I've
been using dnsmasq since F8, no problems whatsoever). I then removed bind
(only bind-libs and bind-utils remain).

Since dnmasq doesn't have an option like '-4' for named, I rebuilt it from
SRPM passing COPTS=-DNO_IPV6 so that I could turn off IPv6 support.
Apparently, it worked:

Dec  4 09:53:12 localhost dnsmasq[5677]: compile time options: no-IPv6
GNU-getopt no-ISC-leasefile DBus no-I18N TFTP

I also enabled port 53 on s-c-f (is this really necessary considering
requests will come from localhost only?)

What happens now is: if I change /etc/resolv.conf to only point to
127.0.0.1(dnsmasq), I get no name resolution at all. Monitoring with
wireshark shows
me queries get to dnsmasq and it correctly forwards them to external DNS
servers. However, replies apparently never come back. *But*, if I remove
127.0.0.1 from /etc/resolv.conf and put external DNS IPs, queries go out and
replies come in as expected.

Anyone knows what could cause this specific behavior? Any help will be much
appreciated. Let me know if you need additional info.

Regards,

Andre
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