It looks like you've spotted the problem (two NICs with the same
hwaddr and ipaddr), unfortunately, I'm not sure how you'd fix it
(scriptwise). I always had problems with the scripts, so I disabled them
and just use the standard networking configuration files in Fedora 8. This
works great, but most people tend to want Xen to deal with it. Before that,
I tried several things, restarting xend was among them, it definitely made a
difference, but I don't remember whether it resolved or intensified the
problem.
Regarding how you're getting rid of the bridge to make it work, I
think you should actually be getting rid of the ipaddr on peth0, my bridge
and peth0 have the same hwaddr, and my bridge has the IP. You may have to
use the route command to remove the extra routes afterwards too (or they may
go away on their own). This will probably make it work, but would be
necessary again after reboots.
Dustin
-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Mike Power
Sent: Wednesday, September 03, 2008 22:55
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Ubuntu 8.04 Hardy Heron bridged networking xen
connectivity loss
Last problem I had involved changing one character in my configuration
scripts. Really easy once someone showed me what was wrong.
Well I think this issue is just the same. The moment I used apt to
install the Xen kernal and tools I lost internet connectivity. I have
been managing because I can restore connectivity be deleting the bridge
mpower@dodtsair:~$ sudo ifdown eth0
mpower@dodtsair:~$ sudo brctl delbr eth0
But that means any domUs will not have connectivity. I have not had any
till now so it wasn't much of an issues. But thanks to your help now I
have XP running.
Ultimately I would really like you to show me the documentation that
tells me how to fix this. I am pretty sure it exists but my googling
has not been effective in this area.
Some things that seem dubious to me are the fact that eth0(the bridge)
looks like an exact clone of peth0 from ifconfig. I would have expected
them to have different HWaddr and at the very least different inet
addr. Another dubious thing is the routing table, double routes one for
each interface. Shouldn't that confuse the heck out of the OS? Lastly
I have no clue why the next line is in the routing table:
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
Here is that status of my system on boot with networking broken:
mpower@dodtsair:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:22:15:3f:f2:0d
inet addr:75.101.5.130 Bcast:75.101.5.255 Mask:255.255.255.0
inet6 addr: fe80::222:15ff:fe3f:f20d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:462 errors:0 dropped:0 overruns:0 frame:0
TX packets:254 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:32133 (31.3 KB) TX bytes:29676 (28.9 KB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:575 errors:0 dropped:0 overruns:0 frame:0
TX packets:575 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:64462 (62.9 KB) TX bytes:64462 (62.9 KB)
peth0 Link encap:Ethernet HWaddr 00:22:15:3f:f2:0d
inet addr:75.101.5.130 Bcast:75.101.5.255 Mask:255.255.255.0
inet6 addr: fe80::222:15ff:fe3f:f20d/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:531 errors:0 dropped:80563353626 overruns:0 frame:0
TX packets:497 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:45589 (44.5 KB) TX bytes:54250 (52.9 KB)
Interrupt:18 Base address:0xa000
mpower@dodtsair:~$ sudo brctl show
bridge name bridge id STP enabled interfaces
eth0 8000.0022153ff20d no peth0
mpower@dodtsair:~$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
75.101.5.0 0.0.0.0 255.255.255.0 U 0 0 0
peth0
75.101.5.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
0.0.0.0 75.101.5.1 0.0.0.0 UG 0 0 0
peth0
0.0.0.0 75.101.5.1 0.0.0.0 UG 100 0 0 eth0
mpower@dodtsair:~$ sudo ethtool eth0
Settings for eth0:
Link detected: yes
mpower@dodtsair:~$ sudo ethtool peth0
Settings for peth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
Link detected: yes
mpower@dodtsair:~$ sudo /etc/Xen/scripts/network-bridge status
============================================================
10: peth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc
pfifo_fast qlen 1000
link/ether 00:22:15:3f:f2:0d brd ff:ff:ff:ff:ff:ff
inet 75.101.5.130/24 brd 75.101.5.255 scope global peth0
inet6 fe80::222:15ff:fe3f:f20d/64 scope link
valid_lft forever preferred_lft forever
11: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
link/ether 00:22:15:3f:f2:0d brd ff:ff:ff:ff:ff:ff
inet 75.101.5.130/24 brd 75.101.5.255 scope global eth0
inet6 fe80::222:15ff:fe3f:f20d/64 scope link
valid_lft forever preferred_lft forever
bridge name bridge id STP enabled interfaces
eth0 8000.0022153ff20d no peth0
75.101.5.0/24 dev peth0 proto kernel scope link src 75.101.5.130
75.101.5.0/24 dev eth0 proto kernel scope link src 75.101.5.130
169.254.0.0/16 dev eth0 scope link metric 1000
default via 75.101.5.1 dev peth0
default via 75.101.5.1 dev eth0 metric 100
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
75.101.5.0 0.0.0.0 255.255.255.0 U 0 0 0
peth0
75.101.5.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
0.0.0.0 75.101.5.1 0.0.0.0 UG 0 0 0
peth0
0.0.0.0 75.101.5.1 0.0.0.0 UG 100 0 0 eth0
============================================================
I'll try the following before I send.
ifconfig eth0 mtu 1496
That didn't work.
Mike Power
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