>The real problem and the reason you have to stop at some point and say "no
>way" is that third parties can send spoof icmps and force the connection
>down to stupid sizes otherwise. Forcing a BGP feed down to 68 bytes MTU
>tends to knock ISP's off the net for example.
Problem is that the parameter is not documented in filesystems/proc
Also, it is not so easy to send spoofed icmps as the icmp must contain the original packet with high len that caused the icmp.
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