Self followup: The broadcom chipset in the Dell system in question (a BCM5721) just doesn't support Jumbo frames....
So that is stuck with a 1500B MTU, and can't be configured higher. Off to go buy a genuine Intel GigE card instead... On Aug 21, 2009, at 9:03 AM, Nicholas Weaver wrote: > I've got a stupid configuration thats adding VLAN tags to a packet > from a dummy interface and then sends it out: > > (userlevel, linux) > > A stripped down representation of the path in question: > > FromHost(dummy, 10.3.128.2/16) -> TagVLAN(164) -> Queue -> > ToDevice(eth1); > > Of course, now I have a problem with MTU packets on FromHost: > > 1496 byte (total size) ICMP packets work no problem... > > 1500 byte (MTU) ICMP packets don't get sent, with a: > ToDevice(eth1) send: Message too long > > error. > > How do I convince ToDevice to send a full frame ethernet packet with > a VLAN tag? > > Thanks. > _______________________________________________ click mailing list [email protected] https://amsterdam.lcs.mit.edu/mailman/listinfo/click
