IPSec Tunnel Mode Ports

Hi All,

I'm trying to connect a client's network to ours using an IPSec tunnel mode
VPN. They have a CheckPoint, we're using ISA 2004. However, the ISA Server
is an internal firewall of a back-to-back configuration. My external
firewall is an ADSL router that needs to be told which packets to forward to
the external interface of the ISA Server.

So what I need to know is: what ports does the internet-facing router need
to forward to ISA Server for IPSec tunnel mode to work?

Thanks,
Mike


.

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