IPSec mobile clients accessing different subnets
I am trying to configure IPSec tunnels for mobile clients to access different subnets behind the firewall. In the document "IPsec with Multiple Subnets", section "Using Mobile Tunnels" it is written, that this should be possible, if one creates a unique Identifier/Pre-Shared Key (PSK) combination for each subnet.
But what is missing in the text: How do I assign the Identifier/PSK to the subnet?
Thanks for your help.