ssh problem

[elad_]

I have a Site to Site VPN both NG AI R55
when i'm open a ssh connection from one site to the other
i can work untill it's stuck
it happens when i'm trying to see a lot of data (ex. ls -R )
sometimes it's happen and sometimes not

anyone have a solution for me ?

[nicodiemus]

This may not be relevant, but have you excluded it from the VPN community?
It might just be sluggish due to travelling over VPN.

[Sergej]

It can be an MTU issues (small packets leaks, big one need to be fragmented, but DF=1. Packet need to be dropped. Information ICMP message about this incident missed out somewhere during transfer). Try to drill down to the Microsoft and CheckPoint Tech support articles.
Keywords:
EnablePMTUBHDetect
EnablePMTUDiscovery
ping x.x.x.x -l 1500 -f

[elad_]

No i dodn't exculed it
and the MTU is the default 1500 on both site

[Sergej]

That's it. Sometimes MTU discovery fails somewhere inbeetween of you firewalls. At this moments big SSH data transfers fails.
You can do a test:
1. (optional) Disable MTU Discovery on the SSH server (I'm not sure how to do this on unix)
2. Set MTU on SSH server to 1300 (fconfig interface_name mtu 1300)
3. Try whatever big commands you want (ls -la, or something like this) thought you Site to site VPN