Re: [Xen-users] Dom0 domU bridge problem - virtualizing ISC DHCP server

[Alexandre Kouznetsov <alk@xxxxxxxxxx>]

Hello.

El 20/07/13 11:08, Jakub Kulesza escribió:
> Where should I start looking? What might be the connectivity problem?
I would start running tcpdump within DomU and Dom0:
- Find out where the DHCPDICOVER reach, and where they not.
- What is missing, the DHCP requests or answers.
- If a multihomed host is involved, does the packets leaves on the right 
interface?
Does the DHCP server shows something in the log?

I had issues with UDP based services on DomU, specifically with TFTP 
server. Solved by disabling checksuming offload on the virtualized NIC 
"ethtool -K eth0 tx off". It ma be added to the corresponding entry in 
/etc/network/interfaces file as "post-up  ethtool -K eth0 tx off".
I do not recall having problems with DHCP server on a DomU, but it has 
been a while since I run dnsmasq almost everywhere, instead of ISC DHCPD.
Greetings.

--
Alexandre Kouznetsov


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