Usage Scenarios
IPSEC transport mode
- Latent demand in wireless and other applications?
Voluntary tunneling
- IPSEC tunnel mode or L2TP/IPSEC between client and server
- NAT between client and server
- NAT in home gateway close to client
- client-gateway communication possible
- NAT-based firewall in front of server
Compulsory tunneling (L2TP/IPSEC)
- Client runs PPP, connects to LAC
- L2TP/IPSEC between LAC and LNS
- NAT between LAC and LNS
- Organization owning the LNS utilizes a NAT-based firewall
- Implication: LAC – firewall communication difficult