[Xen-users] 8th DomU can ping bridge but not internet

["Peter Braun" <xenware@xxxxxxxxx>]

Hi,

there is gentoo based dom0 with Xen 3.0.4-p1 and some PV guests with
various linux distros.

We are using bridged networking with one eth0.

We have 15 IP adresses with netmask 255.255.255.0.
All IPs are using same gateway.

Up to now we were adding domU based on our needs w/o problems.

Yesterday we wanted to add new Debian based domU but its networking
doesnt work properly.

This 8th domU comes up ... than we realized that its not possible to
ping/ssh 8th from outside world. Ping/ssh from dom0 to 8th domU works.
On the other side ping/ssh to other domUs and dom0.

What is realy weird is that domUs 1-7 works total without problem. All
domUs are using same guest kernel. Trying another IP for this last
domU doesnt improve situation. Even using IP from  some working domU.

8th_domU ----- > dom0 = OK
dom0 ------------ > 8th_domU = OK

8th_domU ----- > internet IP =  NO
internet IP ----- > 8th_domU = NO
> From 8th_domU is not possible to get outside, so not possible to get
updates etc..

8th_domU ----- > other_domU = OK
other_domU ----- > 8th_domU = OK



Running route -n in domU:

debian:~# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
59.14.51.0    0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0         59.14.51.1    0.0.0.0         UG    0      0        0 eth0

I think it is missing loopback...?
Ping to gateway doesnt works.


Buth the whole configuration of this domU including kernel is just
same as of the working ones!

Loopback problem in dom0 config?
We are using this: module /xenkernel root=/dev/md2 max_loop=128


Important info:
We do not use iptables in dom0.
Plain default bridge xen install.

We made another test with configuring dummy to the same IP adres like 8th domU:
ifconfig dummy0 59.14.51.10 netmask 255.255.255.0 up
And - yes this is working....ping from outside xen machine w/o problem.

Please can anybody tell me what is going on here?

Br

Peter Braun

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