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SSH “lag” in LAN on some machines, mixed distros
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I've had a strange problem with SSH connections inside my LAN for a few months. It only happens when I'm using my Windows 10 device to connect to a (barebone) linux machine.
When I connect to a SSH server it's like my input is only sent once every second. If I hold a key, it doesn't print anything for a second and after that second I see every keystroke I did during that time.
This is how it looks on the working servers:
This is how it looks on the ones with the issue:
Things I have tested/found out
- Changing the "UseDNS" setting in /etc/sshd doesn't fix it
- It happens with bash (and zsh) on Debian (OpenSSH_7.4p1 Debian-10+deb9u6, OpenSSL 1.0.2r 26 Feb 2019) and Ash on Alpine Linux (OpenSSH_7.9p1, OpenSSL 1.1.1b 26 Feb 2019)
- It doesn't happen on Alpine Linux OpenSSH_7.7p1, LibreSSL 2.7.4
- It doesn't happen with every machine, just some (not depending on the distro)
- resolv.conf is correct
- Error happens with and without ClientAliveInterval (tested on client and server)
- Pinging the devices is always fast (less than 1 ms) so it's only SSH
- It also lags when I ssh from the linux subsystem on Windows 10 and with Putty and with MobaXterm
- No problems when I connect from Linux instead of Windows
Does anyone have any clues or things I could try?
Thanks
linux ssh windows-10 putty lag
asked 2 hours ago
ChristianChristian
83416
add a comment |
I've had a strange problem with SSH connections inside my LAN for a few months. It only happens when I'm using my Windows 10 device to connect to a (barebone) linux machine.
When I connect to a SSH server it's like my input is only sent once every second. If I hold a key, it doesn't print anything for a second and after that second I see every keystroke I did during that time.
This is how it looks on the working servers:
This is how it looks on the ones with the issue:
Things I have tested/found out
- Changing the "UseDNS" setting in /etc/sshd doesn't fix it
- It happens with bash (and zsh) on Debian (OpenSSH_7.4p1 Debian-10+deb9u6, OpenSSL 1.0.2r 26 Feb 2019) and Ash on Alpine Linux (OpenSSH_7.9p1, OpenSSL 1.1.1b 26 Feb 2019)
- It doesn't happen on Alpine Linux OpenSSH_7.7p1, LibreSSL 2.7.4
- It doesn't happen with every machine, just some (not depending on the distro)
- resolv.conf is correct
- Error happens with and without ClientAliveInterval (tested on client and server)
- Pinging the devices is always fast (less than 1 ms) so it's only SSH
- It also lags when I ssh from the linux subsystem on Windows 10 and with Putty and with MobaXterm
- No problems when I connect from Linux instead of Windows
Does anyone have any clues or things I could try?
Thanks
linux ssh windows-10 putty lag
asked 2 hours ago
ChristianChristian
83416
add a comment |
I've had a strange problem with SSH connections inside my LAN for a few months. It only happens when I'm using my Windows 10 device to connect to a (barebone) linux machine.
When I connect to a SSH server it's like my input is only sent once every second. If I hold a key, it doesn't print anything for a second and after that second I see every keystroke I did during that time.
This is how it looks on the working servers:
This is how it looks on the ones with the issue:
Things I have tested/found out
- Changing the "UseDNS" setting in /etc/sshd doesn't fix it
- It happens with bash (and zsh) on Debian (OpenSSH_7.4p1 Debian-10+deb9u6, OpenSSL 1.0.2r 26 Feb 2019) and Ash on Alpine Linux (OpenSSH_7.9p1, OpenSSL 1.1.1b 26 Feb 2019)
- It doesn't happen on Alpine Linux OpenSSH_7.7p1, LibreSSL 2.7.4
- It doesn't happen with every machine, just some (not depending on the distro)
- resolv.conf is correct
- Error happens with and without ClientAliveInterval (tested on client and server)
- Pinging the devices is always fast (less than 1 ms) so it's only SSH
- It also lags when I ssh from the linux subsystem on Windows 10 and with Putty and with MobaXterm
- No problems when I connect from Linux instead of Windows
Does anyone have any clues or things I could try?
Thanks
linux ssh windows-10 putty lag
asked 2 hours ago
ChristianChristian
83416
I've had a strange problem with SSH connections inside my LAN for a few months. It only happens when I'm using my Windows 10 device to connect to a (barebone) linux machine.
When I connect to a SSH server it's like my input is only sent once every second. If I hold a key, it doesn't print anything for a second and after that second I see every keystroke I did during that time.
This is how it looks on the working servers:
This is how it looks on the ones with the issue:
Things I have tested/found out
- Changing the "UseDNS" setting in /etc/sshd doesn't fix it
- It happens with bash (and zsh) on Debian (OpenSSH_7.4p1 Debian-10+deb9u6, OpenSSL 1.0.2r 26 Feb 2019) and Ash on Alpine Linux (OpenSSH_7.9p1, OpenSSL 1.1.1b 26 Feb 2019)
- It doesn't happen on Alpine Linux OpenSSH_7.7p1, LibreSSL 2.7.4
- It doesn't happen with every machine, just some (not depending on the distro)
- resolv.conf is correct
- Error happens with and without ClientAliveInterval (tested on client and server)
- Pinging the devices is always fast (less than 1 ms) so it's only SSH
- It also lags when I ssh from the linux subsystem on Windows 10 and with Putty and with MobaXterm
- No problems when I connect from Linux instead of Windows
Does anyone have any clues or things I could try?
Thanks
linux ssh windows-10 putty lag
linux ssh windows-10 putty lag
asked 2 hours ago
ChristianChristian
83416
asked 2 hours ago
ChristianChristian
83416
asked 2 hours ago
ChristianChristian
83416
asked 2 hours ago
ChristianChristian
83416
asked 2 hours ago
ChristianChristian
83416
83416
add a comment |
add a comment |
1 Answer
1
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votes
Typically this is a sign of Nagel’s algorithm, you can turn that socket option off.
(I have seen similar TCP delays between Linux and Windows before in other cases as well. In one case it was caused by interactions between TCP Windows sizes and PSH (Push) flags which caused Windows to acknowledge late and/or retry.)
answered 2 hours ago
eckeseckes
626516
Awesome, thanks for that quick fix! In the Putty settings I unchecked the "Disable Nagle's algorithm" checkbox (which seems to be ticked by default) and now it works!
– Christian
2 hours ago
@Christian thanks for confirmation, I simplified my answer a bit
– eckes
2 hours ago
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Typically this is a sign of Nagel’s algorithm, you can turn that socket option off.
(I have seen similar TCP delays between Linux and Windows before in other cases as well. In one case it was caused by interactions between TCP Windows sizes and PSH (Push) flags which caused Windows to acknowledge late and/or retry.)
answered 2 hours ago
eckeseckes
626516
Awesome, thanks for that quick fix! In the Putty settings I unchecked the "Disable Nagle's algorithm" checkbox (which seems to be ticked by default) and now it works!
– Christian
2 hours ago
@Christian thanks for confirmation, I simplified my answer a bit
– eckes
2 hours ago
add a comment |
Typically this is a sign of Nagel’s algorithm, you can turn that socket option off.
(I have seen similar TCP delays between Linux and Windows before in other cases as well. In one case it was caused by interactions between TCP Windows sizes and PSH (Push) flags which caused Windows to acknowledge late and/or retry.)
answered 2 hours ago
eckeseckes
626516
Awesome, thanks for that quick fix! In the Putty settings I unchecked the "Disable Nagle's algorithm" checkbox (which seems to be ticked by default) and now it works!
– Christian
2 hours ago
@Christian thanks for confirmation, I simplified my answer a bit
– eckes
2 hours ago
add a comment |
Typically this is a sign of Nagel’s algorithm, you can turn that socket option off.
(I have seen similar TCP delays between Linux and Windows before in other cases as well. In one case it was caused by interactions between TCP Windows sizes and PSH (Push) flags which caused Windows to acknowledge late and/or retry.)
answered 2 hours ago
eckeseckes
626516
Typically this is a sign of Nagel’s algorithm, you can turn that socket option off.
(I have seen similar TCP delays between Linux and Windows before in other cases as well. In one case it was caused by interactions between TCP Windows sizes and PSH (Push) flags which caused Windows to acknowledge late and/or retry.)
answered 2 hours ago
eckeseckes
626516
edited 2 hours ago
answered 2 hours ago
eckeseckes
626516
answered 2 hours ago
eckeseckes
626516
answered 2 hours ago
eckeseckes
626516
626516
Awesome, thanks for that quick fix! In the Putty settings I unchecked the "Disable Nagle's algorithm" checkbox (which seems to be ticked by default) and now it works!
– Christian
2 hours ago
@Christian thanks for confirmation, I simplified my answer a bit
– eckes
2 hours ago
add a comment |
Awesome, thanks for that quick fix! In the Putty settings I unchecked the "Disable Nagle's algorithm" checkbox (which seems to be ticked by default) and now it works!
– Christian
2 hours ago
@Christian thanks for confirmation, I simplified my answer a bit
– eckes
2 hours ago
Awesome, thanks for that quick fix! In the Putty settings I unchecked the "Disable Nagle's algorithm" checkbox (which seems to be ticked by default) and now it works!
– Christian
2 hours ago
Awesome, thanks for that quick fix! In the Putty settings I unchecked the "Disable Nagle's algorithm" checkbox (which seems to be ticked by default) and now it works!
– Christian
2 hours ago
@Christian thanks for confirmation, I simplified my answer a bit
– eckes
2 hours ago
@Christian thanks for confirmation, I simplified my answer a bit
– eckes
2 hours ago
add a comment |
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