Greg Brackley wrote: > I'm trying to get a bridging and VLAN working together with an unexpected > lack of success. ICMP pings are working well, but UDP traffic isn't > working. Without the VLAN interface I can get my XEN/bridging networking > working (but limited by the number of physical interfaces). Without the > XEN > interfaces I regularly setup VLAN interfaces, as well as using 802.3ad > bonding. However I seem to be unable to get the bridges to XEN interfaces > working with VLAN's. > > I'm trying to bridge the traffic from the VLAN interface to a xen vif > interface. I only have IP addresses on the virtual Ethernet interfaces (in > the xen vm's). I've got a default MTU of 1500. > > The machine is a dual Opteron, with PCIe SK-9E22 dual GbE (I also have a > Intel Pro/1000 dual MT in the machine, but it seems to display the same > issue). The kernel is 2.6.12.6 from xen 3.0 unstable. The installation is > Fedora Core 4, x86_64. The switch is a Dell 5324. No firewall rules. No > bridge filtering. > > I'm getting desperate to find a fix. I've been trying to work through this > for a few weeks, and I've made very little progress. I can provide traffic > dumps or any other information. Any help would be appreciated. I must be > missing something simple. What 'driver' does Xen use for ethernet? It's likely that this driver has some hard-coded constraints on packet size that does not take the extra 4 byte VLAN header into account. Or, it could be a checksum support issue or similar. You probably should cross-post this with the bridging and/or xen mailing lists...or just send to netdev@xxxxxxxxxxxxxxx (I think this is probably more a Xen/Bridging problem than VLANs, though it's possible there is a nasty interaction between all three.) Ben -- Ben Greear <greearb@xxxxxxxxxxxxxxx> Candela Technologies Inc http://www.candelatech.com
