SSH Timeouts

Hi Felix,

 

 

This sounds like an issue with ARP rather than SSH. Do you see any IP conflicts in /var/log/ltm when this occurs? You can try to connect via the VE console to avoid the disconnections.

 

 

Also, I suggest contacting your F5 or partner SE to request a BIG-IP VE lab edition evaluation key. The lab edition eval key will work for all current VE versions and not be subject to the limitations that the trial edition has.

 

 

Aaron

I double checked the ARPs and everything appears fine, ie no different ARPs being seen at any point and when I power off the VM i dont get another ARP for the IP.

 

The logs show no issues (??), and the device is licensed with a trail licensed.

 

 

Any other ideas ??

 

You could run tcpdump on LTM VE and see if the resets are coming from LTM:

 

 

Capture on TMM switch ports

 

tcpdump -nni 0.0 host CLIENT_IP

 

 

Capture on maagement port

 

tcpdump -nni eth0 host CLIENT_IP

 

 

 

You could also temporarily enable debug on sshd using 'b sshd loglevel DEBUG'.

 

 

Aaron

The tcpdumps show a RST coming from the F5. I enabled the debug. Do you know where abouts the output for that is wrtten to ?

Has anyone got any other ideas on this. Ive run a debug (on the client) and all I can see is :

 

ssh 'connection reset by peer'. For what ever reason the F5 keeps sending a Reset......??

 

 

 

Further update this seems to only occur then you are connect to one of the self IPs as management rather then the management interface. And this only occurs on the LTM VE trail (???)

Further update this seems to only occur then you are connect to one of the self IPs as management rather then the management interface.have you checked /var/log/ltm? is there any suspicious message there?

 

 

do you have any virtual server listening on that selfip?

 

 

sol9812: Overview of BIG-IP TCP RST behavior

 

http://support.f5.com/kb/en-us/solutions/public/9000/800/sol9812.html

In the end I found that this was only an issue/bug when connecting to a non management interface for management traffic traffic (SSH) within the LTM VE 10.1.

 

 

Thanks,