Fundamentals – PMTUD – IPv4 & IPv6 – Part 1 of 2 | Darren’s Blog


All looks good and works in the lab.

The biggest issue is that both require those ICMP messages to come back to the sending host.

There are a load of badly configured firewalls and ACLs out there dropping more ICMP than they are supposed to. Some people even drop ALL ICMP.

via Fundamentals – PMTUD – IPv4 & IPv6 – Part 1 of 2 | Darren's Blog.

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