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[Xen-users] Network weirdness? (eth0 & eth1)

To: Xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Network weirdness? (eth0 & eth1)
From: Yoav Felberbaum <mailinglists@xxxxxxxxxx>
Date: Mon, 18 Sep 2006 22:30:24 +0100
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Hi,

To sum up the issue - once xend start, the DNS dies, and the IP tables gets thrashed. Whilst I could probably write paragraphs after paragraphs of what I've done/tried etc, I figure a few copy & paste will do... Networking isn't really my area of expertise, but I can see the routing is pretty messed up once xend starts. In addition, eth0 in the xen domU is simply non-functional (no copy & paste from domU for now, as I'm assuming once I've fixed dom0, domU will then work).

(in the following order:- edited ifconfig/route/ping)
Before
---------
eth0      Link encap:Ethernet  HWaddr 00:30:48:58:67:6A
          inet addr:10.4.76.66  Bcast:10.4.76.127  Mask:255.255.255.192
          inet6 addr: fe80::230:48ff:fe58:676a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:92 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:158 (158.0 b)  TX bytes:6026 (5.8 KiB)
          Interrupt:17

eth1      Link encap:Ethernet  HWaddr 00:30:48:58:67:6B
inet addr:75.126.2.202 Bcast:75.126.2.207 Mask: 255.255.255.248
          inet6 addr: fe80::230:48ff:fe58:676b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:129 errors:0 dropped:0 overruns:0 frame:0
          TX packets:108 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:11165 (10.9 KiB)  TX bytes:39760 (38.8 KiB)
          Interrupt:18
------------------------------------------------------------------------ -----------------------------
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface 75.126.2.200 * 255.255.255.248 U 0 0 0 eth1 10.4.76.64 * 255.255.255.192 U 0 0 0 eth0 75.126.3.0 * 255.255.255.0 U 0 0 0 eth1 169.254.0.0 * 255.255.0.0 U 0 0 0 eth1 10.0.0.0 10.4.76.65 255.0.0.0 UG 0 0 0 eth0 default 75.126.2.201-st 0.0.0.0 UG 0 0 0 eth1 ------------------------------------------------------------------------ -----------------------------
# ping apple.com
PING apple.com (17.254.3.183) 56(84) bytes of data.
64 bytes from apple.com (17.254.3.183): icmp_seq=0 ttl=242 time=47.1 ms
------------------------------------------------------------------------ -----------------------------


After:-
---------
eth0      Link encap:Ethernet  HWaddr 00:30:48:58:67:6A
          BROADCAST MULTICAST  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:1000
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
          Interrupt:17

eth1      Link encap:Ethernet  HWaddr 00:30:48:58:67:6B
inet addr:75.126.2.202 Bcast:75.126.2.207 Mask: 255.255.255.248
          inet6 addr: fe80::230:48ff:fe58:676b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:357 errors:0 dropped:0 overruns:0 frame:0
          TX packets:245 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:31945 (31.1 KiB)  TX bytes:72442 (70.7 KiB)
          Interrupt:18
------------------------------------------------------------------------ -----------------------------
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface 75.126.2.200 * 255.255.255.248 U 0 0 0 eth1 75.126.3.0 * 255.255.255.0 U 0 0 0 eth1 169.254.0.0 * 255.255.0.0 U 0 0 0 eth1 default 75.126.2.201 0.0.0.0 UG 0 0 0 eth1 ------------------------------------------------------------------------ -----------------------------
# ping apple.com
ping: unknown host apple.com
# ping 17.254.3.183
PING 17.254.3.183 (17.254.3.183) 56(84) bytes of data.
64 bytes from 17.254.3.183: icmp_seq=0 ttl=242 time=44.3 ms
------------------------------------------------------------------------ -----------------------------
uname -a:-
Linux etna.imagineersystems.com 2.6.16-xen #2 SMP Mon Sep 4 20:25:55 CDT 2006 x86_64 x86_64 x86_64 GNU/Linux

TIA!

Y.



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