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Old 08-01-2008, 08:18 PM
Ryan Golhar
 
Default Bridged Networking with Xen

Hi,

I've got a problem with networking guest OS'es and can't seem to track
down the problem. I suspect it has something to do with not using eth0
on the host machine, rather I'm using eth1.


I have a server running RHEL 5.2 with 4 NIC ports on it. Only 1 port,
eth1 is active. I've modified the /etc/xen/xend-config.xsp to use eth1
using:


(network-script 'network-bridge netdev=eth1')
(vif-script vif-bridge)

I've created a few guest OSes (Linux and Windows) and can't get them to
see the network. One of the guest configurations has:


vif = [ "mac=00:16:3e:48:e3:bc,bridge=xenbr1" ]

If I run /sbin/ifconfig on the host machine, I see:

eth1 Link encap:Ethernet HWaddr 00:1E:68:2F:5A:FF
inet addr:10.168.128.128 Bcast:255.255.255.255
Mask:255.255.255.0

inet6 addr: fe80::21e:68ff:fe2f:5aff/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:73449 errors:0 dropped:0 overruns:0 frame:0
TX packets:36915 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:7220102 (6.8 MiB) TX bytes:11201509 (10.6 MiB)

peth1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:75063 errors:0 dropped:0 overruns:0 frame:0
TX packets:38560 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:7286167 (6.9 MiB) TX bytes:11360621 (10.8 MiB)
Memory:fc5c0000-fc5e0000
vif0.1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:36965 errors:0 dropped:0 overruns:0 frame:0
TX packets:73499 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:11209801 (10.6 MiB) TX bytes:7223402 (6.8 MiB)

vif2.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

vif3.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet addr:192.168.122.1 Bcast:192.168.122.255
Mask:255.255.255.0

inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:27 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:8254 (8.0 KiB)

xenbr1 Link encap:Ethernet HWaddr 42:1C:34:8A:E2:E1
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:18172 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1412937 (1.3 MiB) TX bytes:0 (0.0 b)

The guest OSs can't get a DHCP address. I tried disabling iptables on
the host OS thinking the firewall was blocking something, but that has
not effect.


I've done this before but using eth0. Is there anything else I need to
change that I'm missing?


Ryan
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