Hi there, we're having a buggy, closed source IPv6 router here, which keeps announcing a wrong MTU via ICMPv6 packet too big messages. Is there a way to modify the 1500 to a 1480 with a rule in the mangle table on the host that receives those broken messages? I think despite this one value, also the checksum would have to be recalculated. Cheers, Linus PS: the tcpmss-target extension is not enough, as I'm still having trouble with UDP packets.
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