I have a site to site VPN with PIX515E's as the termination point for each side. I am using DES encryption. There is a DS3 going into each site. I have lowered the MTU setting on both firewalls so that fragmentation didn't occur. All hardware is configured properly. I am able to push data (using a network tool) to fill half the pipe with no performance issues. All of these, yet our speed in between the two sites does not correlate with DS3's at each end, even accounting for encryption overhead. Shouldn't we have that speed available to us? Can anyone help? Thanks much.
I have this problem too.