Re: Question about nat filtering with FORWARD

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Pascal Hambourg a écrit :

ICMP error messages (destination unreachable, TTL exceeded, fragmentation needed...) are in the RELATED state. So you need RELATED if you don't want to break ICMP error signalling and mechanisms which rely on it such as Path MTU Detection (PMTUD).

Oops, s/Detection/Discovery/

Note that ICMP error signalling is a mandatory part of IP operation, and path MTU discovery is enabled by default in Linux, and possibly other operating systems.
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