Re: Refresh of DNS servers

[Derrell.Lipman@UnwiredUniverse.com]

Ralf Angeli <dev.null@iwi.uni-sb.de> writes:

> 2. Disabled the Ethernet interface with ‘ifconfig eth0 down’
>
> 3. Put in the following iptables rule to log the DNS traffic:
>
>    iptables -A OUTPUT -o ppp0 -p udp --dport 53 -j LOG
>
> 4. Started the PPP interface by dialing a provider
>
> 5. Tried to refresh Groups by hitting ‘g’ in the group buffer
>
> The result showing up in /var/log/messages was a query to the name
> server I originally configured for the eth0 interface and not the name
> servers for the dial-up connection.

The name servers are typically listed in /etc/resolv.conf which is one of the
configuration files for the resolver.  The resolver library [see resolver(3)]
which most applications that needs DNS services links with, only reads its
configuration files when res_init() is called, which typically occurs only
when the very first resolver services are required.  It's likely not gnus
that's caching the old nameserver, but rather the resolver library in emacs.
Since emacs is still running, the resolver library is not reinitializing.  I
don't know of any way to force a reinitialization, although one may exist
(some signal, possibly).

Derrell