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Re: RFC 2401 section 5.2.1



On Fri, 24 Nov 2000, Francis Dupont wrote:
> => VPN is not the only usage of IPsec and transport mode is better for
> end-to-end security.

How is it "better"?  Aside from slightly reducing the byte count on the
wire, I mean?

We use tunnel mode for end-to-end security quite routinely.  In fact, it
seems to us that tunnel mode actually gives slightly higher security,
because it obscures whether the communication really *is* end-to-end or is
being done on behalf of other hosts.

> PS: there are many votes about AH in the past, AH is still alive...

So far, yes.

> ...and needed by many IPv6 protocols (cf Itojun's mail).

That is exactly the question:  *should* those protocols be relying on the 
quirks of AH?  It would be better if they could also work with ESP.

                                                          Henry Spencer
                                                       henry@spsystems.net



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