[Xen-users] Xen and DHCP problem

[Franz Von Hahn <franz.vonhahn@xxxxxxxx>]

Hey folks!

I want to add a CentOS 5.2 domU to an existing server (Fedora 8) which was 
setup by another company. The Dom0 does not provide any other services but a 
BIND-DHCP-server (they deleted dnsmasq and installed bind). Don't ask my why 
they did that.

My new DomU is connected to eth0, which is a bridge. BIND also listens on eth0 
to serve other machines.

I start the install of centos with xm create -c mynewdomu. Everything seems 
fine and the installer tries to get an IP. When I look at /var/log/messages in 
the Dom0 I see the DHCP-requests of the new machine:

Sep 26 17:35:53 data-domain0 dhcpd: DHCPDISCOVER from 00:16:3e:aa:bb:dd via eth0
Sep 26 17:35:53 data-domain0 dhcpd: DHCPOFFER on 10.1.0.144 to 
00:16:3e:aa:bb:dd via eth0
Sep 26 17:36:03 data-domain0 dhcpd: DHCPDISCOVER from 00:16:3e:aa:bb:dd via eth0
Sep 26 17:36:03 data-domain0 dhcpd: DHCPOFFER on 10.1.0..144 to 
00:16:3e:aa:bb:dd via eth0
Sep 26 17:36:12 data-domain0 dhcpd: DHCPDISCOVER from 00:16:3e:aa:bb:dd via eth0
Sep 26 17:36:12 data-domain0 dhcpd: DHCPOFFER on 10.1.0.144 to 
00:16:3e:aa:bb:dd via eth0
Sep 26 17:36:25 data-domain0 dhcpd: DHCPDISCOVER from 00:16:3e:aa:bb:dd via eth0
Sep 26 17:36:25 data-domain0 dhcpd: DHCPOFFER on 10.1.0.144 to 
00:16:3e:aa:bb:dd via eth0
Sep 26 17:36:12 data-domain0 dhcpd: DHCPDISCOVER from 00:16:3e:aa:bb:dd via eth0
Sep 26 17:36:12 data-domain0 dhcpd: DHCPOFFER on 10.1.0..144 to 
00:16:3e:aa:bb:dd via eth0
Sep 26 17:36:40 data-domain0 dhcpd: DHCPDISCOVER from 00:16:3e:aa:bb:dd via eth0
Sep 26 17:36:40 data-domain0 dhcpd: DHCPOFFER on 10.1.0.144 to 
00:16:3e:aa:bb:dd via eth0

But there is no DHCPACK. CentOS then quits and asks, if i want to setup the 
network manually. I enter the IP, Netmask, Gate, DNS correctly, but the domU 
gets no access to the network, instead, the installer tries to get an IP from 
the Dom0 via DHCP.

Is this a bug in CentOS 5.2 or does Xen only work with dnsmasq and totally 
ignore entered FIXED IPs?

sorry for my bad english, i hope you understand everything. if not, i can add 
extra info.

greets!


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