Date: Wed, 4 Jun 2025 16:26:46 -0400 From: Michael Sierchio <kudzu@tenebras.com> To: Christos Chatzaras <chris@cretaforce.gr> Cc: Michael Tuexen <michael.tuexen@lurchi.franken.de>, questions@freebsd.org, freebsd-net <freebsd-net@freebsd.org> Subject: Re: Problem with net.inet.tcp.path_mtu_discovery=1 Message-ID: <CAHu1Y732tFmLKZWA85npxYRU0UHRWQ1juFYaPDPfaJ%2BP4ryp5g@mail.gmail.com> In-Reply-To: <13C8668F-0594-4D6D-AFE3-C9DC676570B9@cretaforce.gr> References: <9728060D-2C02-426B-BACE-F2D2F651A62F@cretaforce.gr> <bf557c42-625f-4b8a-b5df-7a45c84e40ee@app.fastmail.com> <D9DE01A2-96DF-4804-875C-2424BEF733F3@cretaforce.gr> <C36F3F3E-F6B2-47B7-BED7-CEE4DAF11354@lurchi.franken.de> <13C8668F-0594-4D6D-AFE3-C9DC676570B9@cretaforce.gr>
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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.
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