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

[Chuck Bearden]

Public bug reported:

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. :-)

** Affects: resolvconf (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: dnsmasq resolvconf

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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:
  New

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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