Sunday, December 15, 2024

Re: Packet loss whilst using ssh

> Have you tried to capture a traffic which contains an example of this packet loss?

Inspecting the captures a bit more closely, I see that OS X sets the DSCP field in the IP header to 0x48 for SSH traffic - as does OpenBSD in its replies.

Linux sets this value to either 0x00 or 0x10 as does Windows for SSH.

OS X seem to tag iperf traffic as 0x00 as well. I wonder if I'm running up against some QoS issue but AFAIK I have QoS disabled everywhere.

Can I use pf to tag egress traffic as 0x00 and see if it goes away?

The issue is intermittent which makes me think it's congestion related.

Regards
Lloyd

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