[OpenWrt-Devel] Fwd: Removing Telnet

Vittorio G (VittGam) openwrt at vittgam.net
Tue Sep 8 12:00:32 EDT 2015

Il 08.09.2015 17:42 Brent Thomson ha scritto:
> Slowness probably depends on hardware as well as all the possibilities
> listed by others. I have a model of router that always takes 2-3
> seconds to initiate an SSH connection, just to set up encryption
> (brief, but computationally intensive; happens with every connection).
> 10 seconds seems really slow, though. Smells like DNS.

It might not be DNS in fact. On AR9331 (MIPS 24k CPU, not that fast...)
starting from Barrier Breaker SSH is pretty slow (3-4 seconds), so on
slower routers the login time can be longer.

If you login with ssh -v, you can see that it waits between

> debug1: expecting SSH2_MSG_KEXDH_REPLY


> debug1: Server host key: RSA [...]

If you check the CPU usage on the router while the client is waiting for
the reply, you can see that dropbear is at 100%.

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