[Xen-users] DHCP and DomUs troubles

[Arnaud Jayet <arnjay@xxxxxxxxx>]

Hello,

i've set up a domU (called 'gwdomu') for acting as a router (NAT + dhcp 
+ firewall services) for a private LAN of machines. i've installed 
dnsmasq package on this domU
1) with as physical machine client in the LAN, it works : the PC gets an 
IP address from dnsmasq / gwdomu, and can go outside via 'gwdomu'
2) with a Xen virtual machine client (i called it 'clientdomu'), it 
doesn't work. 'gwdomu' received several DHCPDiscover requests from 
'clientdomu' and send DHCPOFFER to the client mac address but never 
received DHCPREQUEST / DHCPACK from the client

notes :
1)  i'm using VLAN
2) i'm using Debian Lenny + Xen 3.2-1 for Dom0 and DomU
3) In the 'clientdomu' /etc/network/interfaces i've added the option
post-up ethtool -K eth0 tx off but with no effect... i also put tx off 
in dom0 ethX interface with no more effect.

trace :

domu's config file
# vlan115
vif         = [ 'mac=00:16:3E:7F:BF:11,bridge=xenbr115' ]
dhcp = "on"


clientdomu# cat /etc/net/interfaces
auto eth0
 iface eth0 inet dhcp
 post-up  ethtool -K eth0 tx off


clientdomu# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:3e:7f:bf:11


clientdomu# dhclient eth0
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:16:3e:7f:bf:11
Sending on   LPF/eth0/00:16:3e:7f:bf:11
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 10
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 19
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 18
5 bad udp checksums in 5 packets
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

----

gwdomu with dnsmasq activated (tail syslog) with a DHCP domU:

Jan 30 00:03:41 gwnat dnsmasq[27902]: DHCPOFFER(eth0) 192.168.115.107 
00:16:3e:7f:bf:11
Jan 30 00:03:46 gwnat dnsmasq[27902]: DHCPDISCOVER(eth0) 00:16:3e:7f:bf:11
Jan 30 00:03:46 gwnat dnsmasq[27902]: DHCPOFFER(eth0) 192.168.115.107 
00:16:3e:7f:bf:11
Jan 30 00:04:29 gwnat dnsmasq[27902]: DHCPDISCOVER(eth0) 00:16:3e:7f:bf:11
Jan 30 00:04:29 gwnat dnsmasq[27902]: DHCPOFFER(eth0) 192.168.115.107 
00:16:3e:7f:bf:11
Jan 30 00:04:30 gwnat dnsmasq[27902]: DHCPDISCOVER(eth0) 00:16:3e:7f:bf:11
Jan 30 00:04:30 gwnat dnsmasq[27902]: DHCPOFFER(eth0) 192.168.115.107 
00:16:3e:7f:bf:11
Jan 30 00:04:38 gwnat dnsmasq[27902]: DHCPDISCOVER(eth0) 00:16:3e:7f:bf:11
Jan 30 00:04:38 gwnat dnsmasq[27902]: DHCPOFFER(eth0) 192.168.115.107 
00:16:3e:7f:bf:11

gwdomu with dnsmasq activated (tail syslog) with a DHCP physical PC:

Jan 29 13:01:41 gwnat dnsmasq[16634]: DHCPDISCOVER(eth0) 00:04:75:d1:37:49
Jan 29 13:01:41 gwnat dnsmasq[16634]: DHCPOFFER(eth0) 192.168.115.104 
00:04:75:d1:37:49
Jan 29 13:01:41 gwnat dnsmasq[16634]: DHCPREQUEST(eth0) 192.168.115.104 
00:04:75:d1:37:49
Jan 29 13:01:41 gwnat dnsmasq[16634]: DHCPACK(eth0) 192.168.115.104 
00:04:75:d1:37:49 kodos

any idea ?
thank you for your help

Arnaud

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