TLA Auth Key: when using TLS Authentication headers, put the TLS Auth key
here
Additional Config: extra configuration options otherwise not specified on the web
page here
Policy Based Routing: specify which hosts have traffic down the tunnel (source
based routing TO the tunnel) – default is all traffic where the destination route
points to the tunnel.
PKCS12 Key: Where using PKCS12 keys, put the key here
Static Key: Where using a pre-shared key to encrypt traffic, place the key here.