[nsp] ICMP: time exceeded (reassembly)

[Yuriy Vostrikoff]

"Bulger, Tim" <TBulger at ea.com> writes:

> http://www.cisco.com/warp/public/105/pmtud_ipfrag.html
>
 > Please observe example 4.  If DF bit is set in original packet, it is
> copied to tunnel packet header.  Of course this only applies to packets
> received that are less than the IP MTU of the tunnel as if they were
> larger than that, they would get dropped with 'fragmentation needed and
> DF set' ICMP message.
>

Just few lines above example 4.

The next example shows what happens when the router is acting in the
role of a sending host with respect to PMTUD and in regards to the
tunnel IP packet. This time the DF bit is set (DF = 1) in the original
IP header and we have configured the tunnel path-mtu-discovery command
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
so that the DF bit will be copied from the inner IP header to the
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
outer (GRE + IP) header


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