Port forwarding for GRE protocol
I'm looking after a (small) network at a place, and they recently asked me to enable port forwarding to a new machine they had installed, with the purpose of VPN to that machine. They have a DP G4 running OS X Server 10.4.9 as a gateway to their network.
One of the requests was for traffic on all ports for protocol 47 (GRE) to be passed through to the new machine.
I have seen how to open the firewall to GRE. I have previous experience configuring NAT for TCP & UDP. But I can't figure out how to do port forwarding for GRE. When I tried editing /etc/natd.plist to set the proto attribute to GRE then NAT refused to start. I also tried setting it to 47 without success.
The documentation also says that this value should be set to either UDP or TCP (intentional limitation, or simplification?).
Is there a way of doing this, or am I misunderstanding the concept of GRE?
One of the requests was for traffic on all ports for protocol 47 (GRE) to be passed through to the new machine.
I have seen how to open the firewall to GRE. I have previous experience configuring NAT for TCP & UDP. But I can't figure out how to do port forwarding for GRE. When I tried editing /etc/natd.plist to set the proto attribute to GRE then NAT refused to start. I also tried setting it to 47 without success.
The documentation also says that this value should be set to either UDP or TCP (intentional limitation, or simplification?).
Is there a way of doing this, or am I misunderstanding the concept of GRE?
PM G4 DP, Mac OS X (10.4.9)