Sunday, December 15, 2024

Re: Packet loss whilst using ssh

> You are implying the issue is with OpenBSD

Not at all. If anything I suspected a network misconfiguration and OpenBSD responsible for uncovering it.

> Send your pf.conf and your ifconfig

pf.conf is OpenBSD default and ifconfig is bog standard /24 network with MTU 1500.

Additional testing noted the following:

Affected: OpenBSD, NetBSD, FreeBSD
Not Affected: Linux, Solaris/Illumos, Windows (running OpenSSH)

I've built the latest OpenSSH 9.9 on the client with the same results as the vendor-shipped version.

Strangely, I can spray packets at this OpenBSD host using iperf3 at nearly full rate over the wireless network (~ 250Mbps) with zero packet loss. Only SSH seems to be impacted.

Regards
Lloyd

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