Xen users - Jul 2006 - bridge networking and dhcp

All,
    I have setup xen Dom0 on FC5 and want to get some child os''s
running
using dhcp with 192.168.x.x addresses.

There is a problem with the dhcp requests across the bridged network 
connection. If I connect a seperate (real physical) server vi a 
crossover to the 192.168.0.1 interface and then run dhcpd on it, the the 
dhcp requests are answered correctly. If the dhcp server is running on 
dom0 then they are not.

Anyone solved/seen this before ?

Server has two nics. I have tried eth0 as both the 192.x and real IP 
address with same results. (ie 192.x as bridged and non-bridged nic)
Due to lack of IP addresses, the guest OS''s do need to be 192.168.0.x 
addresses.


Andrew.

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On 7/17/06, Andrew Gray <agray@apnic.net> wrote:
> [...]
> There is a problem with the dhcp requests across the bridged network
> connection. If I connect a seperate (real physical) server vi a
> crossover to the 192.168.0.1 interface and then run dhcpd on it, the the
> dhcp requests are answered correctly. If the dhcp server is running on
> dom0 then they are not.
What do tcpdump, firewall log and syslog on the dom0 look like? Does
your dhcp listen to the right interface, that is, the one that is
connected to the xen bridge?
What do logs on client exactly say when "dhcp request are not answered
correctly"?
Maybe you have selinux and firewalling enabled on dom0 or something like that.

Henning

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