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Re: Multihomed networking: msg#00211
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Subject: |
Re: Multihomed networking |
Yes, but not with the default xen bridging scripts.
On Apr 24, 2006, at 6:27 PM, Mark A Heilpern wrote:
Is anyone using FC5 Xen with an FC5 guest, where the Dom0 has two
ethernet devices (succesfully)?
My system has eth0 as a 192.168.2.x network, eth1 as my static
Internet address, and iptables NAT between them. All real machines
on my home network can get out just fine.
My guest VM, also a 192.168.2.x address, is able to reach other
machines on my internal network without problem, but trying to
access the internet doesn't work. At first I thought it was an
iptables configuration issue on the Dom0 machine, but I don't think
so anymore. As a test, I inserted at the top of every table a rule
to emit a log message when any machine on my net tried to access a
specific remote host; performing a wget command in the guest VM
shows my outbound SYN, shows an incoming SYN+ACK from the remote
host (so outbound masquarading must be working?) and an outbound
ACK (so incoming demasquarading must be working?)... I never
receive another packet from the remote host (until quite a while
later, when I receive FIN). If I try the same exercise with a real
host on my network, I get a normal data stream in/out.
Also, traceroute from the guest VM doesn't work exactly as I would
expect. I would expect the results of one to be quite similar to
those from my Dom0 machine, but consistantly I am missing responses
along the path. For example:
From dom0:
[root@heilpern ~]# traceroute www.yahoo.com
traceroute to www.yahoo.com (216.109.117.106), 30 hops max, 40 byte
packets
1 [my cable modem]
2 10.106.32.1 (10.106.32.1) 8.279 ms 11.786 ms *
3 * * *
4 * * *
5 * * *
6 * * *
7 ae-0-0.bbr2.Washington1.Level3.net (4.68.128.210) 45.855 ms * *
8 ae-21-54.car1.Washington1.Level3.net (4.68.121.114) 35.593 ms
ae-21-56.car1.Washington1.Level3.net (4.68.121.178) 35.382 ms
41.539 ms
9 4.79.228.2 (4.79.228.2) 40.073 ms 39.931 ms *
10 * * *
11 * * *
12 * p21.www.dcn.yahoo.com (216.109.117.106) 35.227 ms *
From the guest VM:
[root@testvm ~]# traceroute www.yahoo.com
traceroute to www.yahoo.com (216.109.117.106), 30 hops max, 40 byte
packets
1 192.168.2.1 (192.168.2.1) 0.000 ms 0.000 ms 0.000 ms
2 [my cable modem]
3 10.106.32.1 (10.106.32.1) 9.910 ms 13.919 ms *
4 * * *
5 * * *
6 * * *
7 * * *
8 ae-0-0.bbr2.Washington1.Level3.net (4.68.128.210) 48.307 ms * *
9 ae-11-51.car1.Washington1.Level3.net (4.68.121.18) 37.938 ms
42.377 ms ae-21-54.car1.Washington1.Level3.net (4.68.121.114)
43.048 ms
10 4.79.228.2 (4.79.228.2) 45.568 ms 43.918 ms *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
[root@testvm ~]#
This is pretty repeatable.
Any thoughts?
Here are my Dom0 configurations:
[root@heilpern ~]# brctl show
bridge name bridge id STP enabled interfaces
xenbr0 8000.feffffffffff no peth0
vif0.0
vif2.0
[root@heilpern ~]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:10:DC:F2:70:17
inet addr:192.168.2.1 Bcast:192.168.2.255 Mask:
255.255.255.0
inet6 addr: fe80::210:dcff:fef2:7017/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:733780 errors:0 dropped:0 overruns:0 frame:0
TX packets:822036 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:87799449 (83.7 MiB) TX bytes:207088442 (197.4 MiB)
[root@heilpern ~]# ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:90:47:03:B8:63
inet addr:[my IP] Bcast:[my BCAST IP] Mask:255.255.255.252
inet6 addr: fe80::290:47ff:fe03:b863/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:829216 errors:0 dropped:0 overruns:0 frame:0
TX packets:556902 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:169446616 (161.5 MiB) TX bytes:85050877 (81.1 MiB)
Interrupt:18
[root@heilpern ~]# iptables -t nat -L
Chain PREROUTING (policy ACCEPT)
target prot opt source destination
Chain POSTROUTING (policy ACCEPT)
target prot opt source destination
MASQUERADE all -- anywhere anywhere
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
(temporary wide-open rules):
[root@heilpern ~]# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Chain INBOUND (0 references)
target prot opt source destination
Chain LOG_FILTER (0 references)
target prot opt source destination
Chain LSI (0 references)
target prot opt source destination
Chain LSO (0 references)
target prot opt source destination
Chain OUTBOUND (0 references)
target prot opt source destination
Thanks in advance...
Mark
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