I'm a CCNA but unfortunately have no experience configuring VPNs from a Cisco device. However, I now have a Cisco 1841 with the Advanced Security feature set and needed to set up a site to site VPN ...

I have a two Sonicwall Pro's linked between SJ/CA and Belfast, Northern Ireland. We have the VPN set up over a 2mbit line at both ends (from uunet), but are only getting 25kps per tcp/ip connection ...