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Re: l2tp as ipsra solution

> As for tunneling, IPsec tunnel mode is more efficient than L2TP+IPsec
> transport mode. 

The overhead argument is a red herring. 

http://www.ietf.org/internet-drafts/draft-aboba-ipsra-req-00.txt discusses
the issue in detail. When L2TP header compression is applied
to L2TP, this results in only one additional octet of overhead compared
with IPSEC tunnel mode. And when PPP mux is used, the overhead
for L2TP is actually much *less* than for IPSEC tunnel mode.