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xen-users
RE: [Xen-users] Xen and DHCP problem
Franz Von Hahn wrote:
>
> 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.
Probably the admin in charge of dom0 didn't setup either the
domU interface or the iptables in dom0 properly.
-Ross
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