Subject: Re: [vserver] network issues with lo interface
From: Herbert Poetzl <herbert@13thfloor.at>
Date: Sun, 22 Feb 2009 23:45:31 +0100

On Sun, Feb 22, 2009 at 04:46:41PM +1300, Corin Langosch wrote:
> Hi again!
> 
> I migrated from vserver 2.2.0.6 (kernel 2.6.22) to 0.30.216-pre2772
> (kernel 2.6.26) and have another network issue. I have a daemon running
> in a guest and binding to 127.0.0.1:8002 (netstat -lnp shows correct
> output). A client running in the same guest now wants to connect to
> this daemon. The connection fails. Even testing the stuff with telnet
> fails.
> 
> I  checked the host, and found these dropped packets (because of my
> firewall):
> 
> firewall (dropped):IN=lo OUT=
> MAC=00:00:00:00:00:00:00:00:00:00:00:00:08:00 SRC=127.179.144.1
> DST=127.179.144.1 LEN=60 TOS=0x10 PREC=0x00 TTL=64 ID=2390 DF PROTO=TCP
> SPT=55160 DPT=8002 WINDOW=32792 RES=0x00 SYN URGP=0

> I wonder why the system tries to connect to 127.179.144.1 although I
> typed "telnet 127.0.0.1 8002"? Is this a bug or a feature? ;-)

this is your firewall dropping the guest
traffic to 127.0.0.1 (which gets remapped 
if the config uses lback remap)

best,
Herbert

> Thanks,
> Corin