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site to site vpn over adsl

By Mav1971 ·
I have two small offices eah with a static IP address and a Netscreen 5 Firewall. Main office has 6 PC's running XP and 1 Win2k Server.
I have a route based VPN linking the sites with the main office on a 192.168.16.0 network and the other office on a 192.168.15.0 network.
I can see each office fine now that I have entered the details of the servers IP into the lmhosts file but it takes an age to open/save files across the link. I have an MTU of 1400 on each firewall.
Anyone have any ideas what the issue could be causing the delay in opening files and would installing WINS on the server make any difference even though name resolution is taking place?
Or any other ideas on speeding the connectivity up
Many thanks

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by Chris910 In reply to site to site vpn over ads ...

You say you are using ADSL your connections will be limited by your upload speed at both sites. if you are garenteed 128/384 your fastest conection speed would be 128 which is the limit of the sending side. not the 384 as if you where downloading from someone with a really fast connection.

hope this helps

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by Mav1971 In reply to site to site vpn over ads ...

Thanks Chris, I ended up finding the problem as being the GRE tcp mss settings and entered these commands on both firewalls.

set flow gre-in-tcp-mss 1400
set flow gre-out-tcp-mss 1400
save

and it seems to have done the trick

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