Re: [uml-devel] No DNS resolution on uml guest

["roland" <for_spam@gmx.de>]

Hi Roland,
> The guest os (Fedora 2) cannot make any name resolution but the "normal" network
> works properly.
and you can ping the nameserver from inside the uml ?
do you see any udp-packets leaving the uml (do a tcpdump on the uml`s eth0 and on the hosts bridge interface) ?
if not, can you try to send some udp packets from/to the uml with "nc" (netcat - network admins swiss army knife) to make sure, that
it probably isn`t a problem with the resolver ?

> The guest file system and the machine installation have exactly
> the same files. When I try to make the dns resolution on the original machine it
> works well.  The resolution on the uml guest doesn't works event when the whole
> package filter (iptables) is disabled and set to accept.
You use different IPs for them , do you ?
If not, and if you use the machines one after each other, keep in mind that the ARP-Cache of the DNS-Server (if on the same lan) or
the first Hop(Router) between your UML and the DNS Server need to expire the MAC/IP pair it has learned before, until it can
communicate with the same IP "on another MAC" again.

Roland(/too)


----- Original Message ----- 
From: "Roland Kaeser" <roli8200@yahoo.de>
To: <user-mode-linux-devel@lists.sourceforge.net>
Sent: Tuesday, December 07, 2004 5:37 PM
Subject: [uml-devel] No DNS resolution on uml guest


> Hello All
>
> I have a very strange behaviour on a uml guest system.
> The guest os (Fedora 2) cannot make any name resolution but the "normal" network
> works properly.
> I'm using the guest file system which i have snapshoted from a special installation
> on a "real" machine. The guest file system and the machine installation have exactly
> the same files. When I try to make the dns resolution on the original machine it
> works well.  The resolution on the uml guest doesn't works event when the whole
> package filter (iptables) is disabled and set to accept.
> I use a linux bridge to communicate with the outside world.
>
> Roland
>
>
>
>
>
>
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