Re: Problem with net.inet.tcp.path_mtu_discovery=1

In reply to: Christos Chatzaras : "Re: Problem with net.inet.tcp.path_mtu_discovery=1"
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From: Michael Sierchio <kudzu_at_tenebras.com>
Date: Wed, 04 Jun 2025 20:26:46 UTC

On Wed, Jun 4, 2025 at 3:58 PM Christos Chatzaras <chris@cretaforce.gr> wrote:
>
> With these settings, is the connection supposed to work even if an intermediate router is dropping the ICMP messages required for Path MTU Discovery? I tried this configuration, but it didn’t resolve the issue.

No. Path MTU Discovery breaks if you drop the ICMP "fragmentation
needed and DF set" packet is sent.