I know, I misunderstand the iph->tot_len, the ICMP payload is not
contained a valid ipv4 packet.
I do this under IPv6, it has no problem because IPv6 does not check
this. ^_^
Thank you very much.
But this is not the old_mtu field that we were talking about. The
old_mtu field comes from iph->tot_len which is the length of field
in the *original* IP header. We're certainly not allowed touch that
field.
Cheers,
--
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