[Bridge] Bridge not bridging NFS fragments?

Stephen Hemminger shemminger at osdl.org
Mon Aug 2 15:42:21 PDT 2004

On Tue, 3 Aug 2004 00:33:29 +0200
Matthias Andree <matthias.andree at gmx.de> wrote:

> On Mon, 02 Aug 2004, Stephen Hemminger wrote:
> > I am worried what happens if you bridge a 4K mtu lan to a 1500 mtu lan..
> > It is likely that the ethernet driver of the smaller mtu lan will oops or
> > hang while trying to send the huge skb. No other code path would hand
> > a huge mtu to a device.
> Is this something that can be simulated in ethernet, by setting one
> net's MTU to 500 or something?

You could set the mtu smaller, but the hardware still would accept
bigger packets. A simple test would be to setup something like a tun or tap
connection bridged to an ethernet device.

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