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xen-devel
[Xen-devel] Jeremy's GIT-tree and network problems
Hi!
I have bridging problems with the Dom0 kernels from Jeremy’s tree.
I wrote a mail to xen-user (MSG-ID
<20091220T1944.GA.ab998.stse@xxxxxxxxxxxxxxxxxxx>, 20 Dec 2009), but
without solutions. So I try xen-devel this time.
My hardware setup:
A PC with two NICs (Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI
Express Gigabit Ethernet controller) is used as working environment
(Dom0) and as firewall/proxy/DSL-router (DomU).
The two NICs are bridged between Dom0 and DomU.
Bridge eth0 containing peth0 and vif1.0 has an IP address in Dom0 and
DomU. The DomU IP address is the gateway address in Dom0.
Bridge xenbr1 containing eth1 and vif1.1 has no IP address in Dom0 and
DomU and is only used to connect the DSL modem to DomU. The IP address is
given to the PPP interface in DomU.
Linux distribution is Debian/Testing (64bit) with XEN version 3.4.2 in
December and 3.4.3rc3 now. The kernels are always self-compiled.
My working setup:
Dom0 with kernel 2.6.29.5 with xen-patches-2.6.29-6.tar.bz2 and DomU with
standard kernel 2.6.32.x (and the 2.6.29.5 xen kernel before). The
hypervisor was 3.4.2 and is now 3.4.3rc3.
Here everything works as expected. DomU acts as firewall and is using
correct masquerading for all internet traffic.
My non-working setup:
Dom0 with the PV-Ops kernel from Jeremy’s tree (I tried the follwoing
kernels: 2.6.31.5-00500-g34013be, 2.6.31.6-00696-g41a0695 (tested in
December) and now from xen/stable the versions 2.6.32.10-02792-gf112549
and 2.6.32.10-02798-gd945b01). DomU kernel and hypervisor are the same as
in the working setup.
What is working?
IP connection between Dom0 and DomU is working and between DomU and the
internet. Traffic from Dom0 to the internet is working if DomU is used as
a proxy (e.g. HTTP traffice with a squid in DomU).
What is not working?
Direct IP connection between Dom0 and the internet (tested with ping and
„telnet <host> <port>”.
If I trace in DomU I see the packets leaving the ppp0 interface
(correctly masqueraded), but I see no answering packets.
If I trace in Dom0 using the bridge interfaces between the DSL modem and
DomU (xenbr1, eth1, vif1.1, see hardware setup above), I don’t see the
packets anymore. I only see packets from traffic generated directly by
DomU.
The DomU configuration between the working and non-working setup is not
changed, only the Dom0 kernel is changed.
So if anyone has an idea, what this could be and how to fix it, I will be
glad.
Further information:
The NIC and the bridge driver are the same in all kernels from 2.6.29.5
until 2.6.32.10:
osgiliath:~# ethtool -i eth1
driver: r8169
version: 2.3LK-NAPI
firmware-version:
bus-info: 0000:03:00.0
osgiliath:~# ethtool -i xenbr1
driver: bridge
version: 2.3
firmware-version: N/A
bus-info: N/A
The only difference in the output of „ethtool eth1” are additional
information about „link partner advertised modes” in the 2.6.3x kernels.
„ethtool -k eth1” shows the error message „Cannot get device flags:
Operation not supported” in the working setup for the working Dom0
kernel. All other output is identical in all kernel versions:
osgiliath:~# ethtool -k eth1
Offload parameters for eth1:
rx-checksumming: on
tx-checksumming: off
scatter-gather: off
tcp-segmentation-offload: off
udp-fragmentation-offload: off
generic-segmentation-offload: off
generic-receive-offload: off
large-receive-offload: off
Switching rx-checksumming off does not help.
dmesg and the log files don’t show error messages in the non-working
setup.
Shade and sweet water!
Stephan
--
| Stephan Seitz E-Mail: stse@xxxxxxxxxxxxxxxxxxx |
| PGP Public Keys: http://fsing.rootsland.net/~stse/pgp.html |
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