On Tue, May 01, 2007 at 08:44:45AM +0200, Markus Hennecke wrote: > On Tue, 1 May 2007, Bob wrote: > > >I tried to look this up with google, but didn't find any sensible answers. > >I.e. I'm building a gigabit network at home, and I now have an 100Base-TX > >network here. I would like to add a gigabit network to it. This gigabit > >network will ofcourse run with jumbo frames. Now my question is basically, > >can I plug an em and a fxp network cards into a machine and configure it to > >run with brconfig? Will the bridge fragment oversized packets from the > >gigabit network when talking to the 100Base-TX network? I'm running > >ofcourse > >OpenBSD 4.1-current on the machine that acts as a bridge. > > This is not possible. The bridge just takes a paket from one interface and > puts it on the other interface(s). So jumbo frames are no option if a > 100Base-TX network is connected. > > You could route between the two networks, then the router would fragment > the pakets if they are too large.
Actually the bridge in OpenBSD can handle this provided the packet is IP and the DF bit is not set. If the IP packet is too large for the outbound interface it will be fragmented.
