Hi all,
sorry for the previous partial e-mail, I hit the send button accidentally
;-).
I have a setup with a kvm-based virtual machine running a stock RedHat 6.1
(yes, that old) on a rather current debian host.
1. uname in host: 2.6.26-2-amd64 #1 SMP Wed May 12 18:03:14 UTC 2010
x86_64 GNU/Linux
2. uname in guest: 2.2.12-20 #1 Mon Sep 27 10:40:35 EDT 1999 i686 unknown
eth0 of the guest is connected via tap0 to a kernel bridge, that is in
turn connected via the host's eth1 to a Gigabit link. On the kvm
command-line I configure the guest-nic as "model=ne2k_pci".
The problem is, that I frequently loose network access from/to the guest.
I can see following diagnostics:
1. on the host:
ifconfig output:
brvm0 Link encap:Ethernet Hardware Adresse 00:24:81:f9:9c:ee
inet Adresse:10.0.2.11 Bcast:10.0.2.255 Maske:255.255.255.0
inet6-Adresse: fe80::224:81ff:fef9:9cee/64
Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
RX packets:1120958 errors:0 dropped:0 overruns:0 frame:0
TX packets:373699 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:0
RX bytes:138554311 (132.1 MiB) TX bytes:32663228 (31.1 MiB)
eth0 ...
eth1 Link encap:Ethernet Hardware Adresse 00:24:81:f9:9c:ee
inet6-Adresse: fe80::224:81ff:fef9:9cee/64
Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
RX packets:3563790 errors:0 dropped:0 overruns:0 frame:0
TX packets:2393282 errors:0 dropped:0 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX bytes:4059696847 (3.7 GiB) TX bytes:185671712 (177.0 MiB)
Interrupt:19 Speicher:fa000000-fa012100
lo ...
tap0 Link encap:Ethernet Hardware Adresse 00:ff:19:c8:e6:04
inet6-Adresse: fe80::2ff:19ff:fec8:e604/64
Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
RX packets:3244437 errors:0 dropped:0 overruns:0 frame:0
TX packets:5080877 errors:0 dropped:96605 overruns:0 carrier:0
Kollisionen:0 Sendewarteschlangenlänge:500
RX bytes:286049649 (272.7 MiB) TX bytes:4114169266 (3.8 GiB)
netstat -i looks similar:
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR
Flg
brvm0 1500 0 1121135 0 0 0 373788 0 0 0
BMRU
eth0 ...
eth1 1500 0 3563962 0 0 0 2393370 0 0 0
BMRU
lo ...
tap0 1500 0 3244471 0 0 0 5081115 0 96605 0
BMRU
I see a lot of dropped frames on tap0/TX.
2. In the guest:
eth0 Link encap:Ethernet HWaddr 02:11:BD:12:01:00
inet addr:10.0.2.12 Bcast:10.0.2.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3517949 errors:459 dropped:0 overruns:0 frame:6
TX packets:2439841 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:11 Base address:0xc100
lo ...
netstat -i:
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP
TX-OVR Flg
eth0 1500 0 3518044 459 0 0 2439871 0 0 0 BRU
lo ...
There is lost data on eth0/RX.
Also there are related messages from dmesg in the guest:
eth0: bogus packet size: 22597, status=0x16 nxpg=0xb3.
eth0: next frame inconsistency, 0xb3
eth0: bogus packet size: 64780, status=0xf3 nxpg=0x38.
eth0: bogus packet size: 60666, status=0xc5 nxpg=0x28.
eth0: bogus packet size: 40656, status=0x7f nxpg=0xfd.
eth0: next frame inconsistency, 0xfd
eth0: bogus packet size: 56339, status=0xc nxpg=0x27.
eth0: bogus packet size: 18323, status=0x4b nxpg=0xc4.
eth0: next frame inconsistency, 0xc4
Can someone please tell me, what might be the problem? Or point me to the
right direction, if this is OT here.
TIA,
aa
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