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We have 4 routers covering our house/outbuildings - one that actually routes and 3 wired to it and set as access point only.

My SSH PuTTY sessions are generally pretty rock-stable, but if I move from upstairs (RT-N66u) to downstairs (RT-AC68u) or vice versa it cuts out every single time.

The SSID have the same name. Both are 2.4GHz. Upstairs is N, downstairs is AC.

Running latest Windows 10 on my laptop, and PuTTY 0.73. In my ssh_config I have these lines:

ClientAliveInterval 5
ClientAliveCountMax 12

In PuTTY I have

Seconds between keepalives (0 to turn off)       25
Disable Nagle's algorithm (TCP_NODELAY option)   checked
Enable TCP keepalives (SO_KEEPALIVE option)      checked

Any other salient information that I'm missing?

Is this a fixable problem, or "just the way it is"?

Thank you.

Codemonkey
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1 Answers1

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The problem for me was down to Windows' Receive Window Auto-Tuning Level setting.

Here's MS's description of it:

https://docs.microsoft.com/en-gb/troubleshoot/windows-server/networking/receive-window-auto-tuning-for-http

Open a command prompt ("run as administrator") and issue this command:

netsh int tcp set global autotuninglevel=disabled

Then restart.

Certainly fixed it for me on my Windows 10 laptop.

Codemonkey
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