[Bug 999395] Re: 12.04 system unable to resolve us.archive.ubuntu.com with resolvconf/dnsmasq

[Steve Langasek]

> Changing the nameserver in /etc/resolv.conf to point to the router makes no difference.
> Changing it to point directly to my ISP's DNS server makes name resolution work.

So it seems that this is a bug in your router's DNS server, and nothing
to do with either resolvconf or dnsmasq.  You either need to edit the
network manager profile for this connection to point at your ISP's DNS
server instead of at your router, or edit your router's DHCP settings to
point at the ISP's DNS instead of at itself.

** Changed in: resolvconf (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/999395

Title:
  12.04 system unable to resolve us.archive.ubuntu.com with
  resolvconf/dnsmasq

Status in “resolvconf” package in Ubuntu:
  Invalid

Bug description:
  Install ISO: xubuntu-12.04-desktop-amd64.iso
  dnsmasq-base: 2.59-4
  resolvconf: 1.63ubuntu11

  My first time to install 12.04, so no prior experience with
  resolvconf/dnsmasq.

  I used the 64-bit Xubuntu desktop CD-ROM to install to a brand-new
  hard disk. The machine has a wireless interface (unused) and an
  ethernet interface, which is assigned its IP address by my router via
  DHCP. The generated resolv.conf (attached) points to 127.0.0.1 as the
  nameserver. The nm-dns-dnsmasq.conf in turn points to the router
  (192.168.3.1) as the DNS server.

  The system, once installed, cannot get updates from
  us.archive.ubuntu.com because of a name-resolution problem. It looks
  as though any DNS query that returns a large answer (many IP addresses
  for a name, e.g.), isn't handled.

  cbearden at anselm:~$ host us.archive.ubuntu.com
  ;; Truncated, retrying in TCP mode.
  Host us.archive.ubuntu.com.Belkin not found: 5(REFUSED)
  cbearden at anselm:~$ host www.hal-pc.org
  www.hal-pc.org has address 204.52.135.18

  When the first query (UDP) is issued, the router responds with the
  answer (see the attached text output of a tcpdump trace), but the
  system ignores the response and queries the router via TCP, but the
  connection is refused.

  Changing the nameserver in /etc/resolv.conf to point to the router
  makes no difference. Changing it to point directly to my ISP's DNS
  server makes name resolution work.

  This may be the same bug as #998712, but I'm can't tell for sure.

  I'm attaching
    a tar file containing 
    * /etc/resolv.conf
    * /etc/resolvconf/*
    * /run/resolvconf/
    /etc/network/interfaces
    /run/nm-dns-dnsmasq.conf
    /var/log/syslog
    and the text output of the tcpdump trace mentioned above.

  I'll work around this problem manually to be able to get updates and
  resolve names. Or, if I did something wrong in my setup, I'll gladly
  accept instruction. :-)

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