Ports on firewall for IPsec connctivity

[kapishmohole.cisco]

Hello

I am new to VPN.

I want to know which ports I should open on firewall so that user can access another network.

I am using Cisco VPN client 4.x , and I want to connect to another corporate network from my one. I did necessary NAT to get a public IP.

But instead of opening all the ports for that private IP, I want to open the only required ports, those are must for establishing connectivity, I know the other application ports.

Can any one tell me those..?

[Richard Burts]

The ports to use may very somewhat based on config options you may use in the client. But the standard requirements for IPSec include UDP port 500 for ISAKMP negotiation and ESP which is IP protcol 50.

HTH

Rick

[sachinraja]

Also open UDP 4500 when using IPSEC clients to pass through the firewall.

All the best !!