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problems with new raspian trixie release #259
Description
In this file are 2 "fixes" for ssh:
### Fix SSH incoming
echo "IPQoS 0x00" >> /etc/ssh/sshd_config
### Fix SSH outgoing
echo "IPQoS 0x00" >> /etc/ssh/ssh_configI don't know what they exactly should fix but with debian trixie they prevent sshd from starting. So these lines should be removed or only executed for releases before trixie.
Other improvement would be to increase BASE_IMAGE_ENLARGEROOT in this file, the current default 200 was not sufficient anymore when building MagicMirrorOS.
Activity
guysoft commentedon Oct 3, 2025
The IPQoS directive in sshd_config controls the IP Type of Service (ToS) or Differentiated Services Code Point (DSCP) field for SSH connections. Setting it to 0x00 effectively disables Quality of Service (QoS) for SSH traffic.
This particular setting is often used as a workaround for specific SSH connectivity issues, particularly on devices with limited network capabilities like some models of Raspberry Pi (e.g., Pi Zero W), where the default QoS settings might cause connection instability or freezing when connecting over Wi-Fi. By disabling QoS, it can prevent the SSH server from attempting to optimize traffic in a way that is incompatible with the device's network performance, leading to a more stable connection.
Its a fix for unstable wifi connections over ssh.
Its strange that it would break in Trixie, do you have the output of the sshd log?
khassel commentedon Oct 3, 2025
root@efaa594c0c4d:/# /usr/sbin/sshd /etc/ssh/sshd_config line 125: Bad IPQoS value: 0x00guysoft commentedon Oct 3, 2025
ok, it needs to be changed from
to
It might have been detracted in the openssh 10 which is shipped in trixe, but I can't find where the docs.
fix ssh for trixie (see guysoft/CustomPiOS#259 (comment))
fix ssh for trixie (see guysoft/CustomPiOS#259 (comment)) (#88)
Fix deprecated IPQoS sshd flag Fixes #260 #259
guysoft commentedon Nov 2, 2025
This is been fixed.