bill001g said:
All you can do is try. You would port forward 1723 or put the machine in the DMZ. As you have found out the other part of pptp is the gre protocol 47 issue. Most routers vpn passthough just works but if your device has it disabled its going to be tough. This is why sslvpn is getting more and more popular. It is a little slower than l2tp or pptp but it passes though anything.
The VPN spec of RV042 are:
IPsec
50 IPsec site-to-site tunnels for branch office connectivity
QuickVPN
50 QuickVPN tunnels for remote client access
PPTP
5 PPTP tunnels for remote access
Encryption
Data Encryption Standard (DES), Triple Data Encryption Standard (3DES), and Advanced Encryption Standard (AES) encryption; AES-128, AES-192, AES-256
Authentication
MD5/SHA1 authentication
IPsec NAT traversal
Supported for gateway-to-gateway and client-to-gateway tunnels
VPN pass-through
PPTP, L2TP, IPsec
Advanced VPN
Dead peer detection (DPD), IKE, split DNS
Linksys RV042 Manual
Do you think RV042 support SSL VPN?