I have a site-to-site VPN b/ my HQ and my remote branch and I am facing slowness in VPN big time when synching emails through MS Outlook, however when connecting through remote VPN the users are not facing this slowness and are synching emails just fine.
I know IPSec adds overhead over IP traffic which is about 56 bytes, please correct if I am wrong. Now does Site-to-site VPN add more overhead than what the remote VPN adds causing this slowness? Or could that be due to wrong site-to-site VPN between the PIX and the remote branch's VPN device? By the way, for remote users VPN I am currently using Microsoft VPN.
Appreciate your response on this.