[Click] MTU in click

[Harald Schiöberg]

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Again, on my tcp thing:

Is their a way to determine the MTU for an output port in click?

This is certainly a hard problem, since downstream elements may add
additional headers before handing the packet over to the network device.

If not: is there a reliable way to probe the outgoing MTU? TCP should be
able to react to ICMP Can't Fragment Error, but these are certainly not
received if a local downstream element cannot deliver the packet to the
interface.


thanks
	harald


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Harald Schiöberg
Technische Universität Berlin | T-Laboratories | FG INET
www: http://www.net.t-labs.tu-berlin.de
Phone: +49-(0)30-8353-58476 | Fax: +49-(0)391 534 783 47
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