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What ports need to be open for an IPsec VPN client to work?You will need to be certain that your firewall allows the following protocols inbound/outbound:
Also, you will need one of the following two:
If you are behind a device that does NAT (Network Address Translation) you will need to be sure it handles the IKE packets (i.e. it should know not to change the source port on IKE packets). On the Linksys model routers you do this by checking the "IPSec Passthrough" option, but most other firewalls know this protocol as well. These ports should allow any IPsec VPN client including CISCO and Nortel. Source: Brown University Wiki |