PMTU Discovery support

Tue Mar 6 05:05:46 UTC 2007

RFC 1191 says to increase the PMTU at some itnerval (15 minutes default)
next time a packet is sent, this will be used... and if PMTU is really
increased,
no ICMP error will be recieved. that shows an increase in the PMTU. I'm
trying to
understand if this mechanism is there in freebsd. any on this is appreicated
thanks,
Aditya

On 3/6/07, Lyndon Nerenberg <lyndon at orthanc.ca> wrote:
>
> > As I understand it, it is not possible to detect upward changes in the
> path
> > MTU as there is no mechanism for a router to generate an error when a
> packet
> > is small enough to be accommodated by the MTU of the link to the next
> hop.  I
> > may be wrong though.
>
> RFC1191 section 6.3.
>
> http://www.ietf.org/rfc/rfc1191.txt
>
> --lyndon
>