152 Chapter 8 Configuring IPSec mobility and persistent mode
NN46110-500
IPSec mobility in NAT environment
In some situations roaming in the environment of NAT devices might prevent
users from taking full advantage of IPSec mobility feature. Table 11 illustrates
some configuration caveats that will allow to increase roaming effectiveness in
NAT environment.
*The appropriate IPSec group settings (Auto-Detect NAT, Always UDP Encap, or
Auto-Detect IPSec capable NAT) makes the initial connection successful. No
changes are required for roaming to work.
Routing table changes
Routing table changes apply to the Nortel VPN Client. When operating in split
tunneling mode, the NVC periodically checks the routing table on the client's PC
to determine if the table has been altered in any way. This checking is done for
security reasons to detect for intrusions and unauthorized access to the private
network. When a routing table change is detected the tunnel is brought down.
Table 11 Configuration considerations
Initial NVC connection
was behind
After roaming NVC
connection is behind
Nortel VPN Router
configuration caveats to
make mobility work
successfully
No NAT No NAT None
IPSec unaware NAT Always NAT Traversal
IPSec aware NAT Always NAT Traversal
IPSec aware NAT No NAT None*
IPSec unaware NAT Always NAT Traversal or
auto-detect NAT
IPSec aware NAT None*
Non-IPSec aware NAT No NAT None*
IPSec unaware NAT None*
IPSec aware NAT None*
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