I have two sites, certain users will vpn into the other office periodically to access some data files. There is not a site to site vpn setup, they just connect directly from their desktop using pptp. I can connect from site A to site B without any problems and can stay connected for days. When connecting from site B to site A the connection is dropped immediately. From what I have found this coule me an MTU size issue. I performed the ping domain.com -f -l and found that 1472 is the largest size that does not get fragmented.
I want to change the mtu size at site A to see if this helps. Do I need to make this change on all workstations at site A as well? Do I need to change the mtu size that is going out at site B?