I have a GRE VPN set up and partially (I think) working. I have two linux systems connecting two separate subnets to the internet. I have a VPN set up between the two of them. I can ping their respective internal IP addresses (we''ll call them 192.168.1.1 and 192.168.2.1 for the sake of argument) just fine. I also have two Windows workstations on the internal networks (we''ll call them 192.168.1.100 and 192.168.2.100). Should it be possible for me to ping 192.168.1.100 from 192.168.2.100 and vice-versa? I can ping 192.168.1.1 from 192.168.2.1 and 192.168.2.100 and I can ping 192.168.2.1 from 192.168.1.1 and 192.168.1.100 but I can''t ping 192.168.1.100 from 192.168.2.100 or vice-versa. I hope I didn''t lose anybody there :) I''m sure I''m just missing something simple. I anyone could throw some ideas at me, and/or point out any possible kernel options I may have failed to compile in, I would appreciate it. TIA, Ron Brinker EMC Computers service@emcis.com