Subject: [mobile-ip] benafits and drawbacks with nat traversal

From: Hans Sjöstrand <[email-masked]>
Date: Mon, 24 Jun 2002 14:38:06 +0200

Serge,

Could you explain why implementing NAT traversal with "UDP Encapsulation 
of IPsec Packets" is an benafit while implementing it with "Mobile IP 
NAT/NAPT Traversal using UDP Tunnelling" is a drawback?

 From draft-tessier-mobileip-ipsec-00.txt

>   Figure 1: Mobile IP tunnel in IPSec VPN tunnel 
>
>   While the drawbacks are: 
>   - Since local networks use usually private addresses, NAPT is a 
>     major problem. A solution like the one described in [7] needs 
>     to be applied 
>

>   Figure 2: IPSec VPN tunnel in Mobile IP tunnel   
>                   
>   The benefits are:
>   - NAPT is not a problem for Mobile IP since it is solved by the
>     IPSec tunnel  
>

Regards
/// Hasse