After configuring two machines (e.g. connected with a crossover cable) to use jumbo frames like this:
# Intel Corporation 82574L Gigabit Network Connection
and similarly on the other machine, the Xen bridge will not be created with MTU set to 9000. This is necessary for the bridge to work with large MTU:
ip link set mtu 9000 dev vif0.1
ip link set mtu 9000 dev peth0
ip link set mtu 9000 dev xenbr0
The network-bridge script (and friends) should be changed so that this happens automatically.
The patch depends on the one for bug 697310.
Fix built into xen-3.0.3-134.el5
Change to verified per bug 697021 comment 37 and bug 733416 comment 12.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.