Re: AH is pretty useless and perhaps should be deprecated

[Jack Kohn <kohn.jack () gmail com>]

I read the draft and its very interesting. There were some issues that
i had never imagined could exist and it does a wonderful job of
brining them forth.

However, i still dont understand why AH would be preferred over
ESP-NULL in case of OSPFv3. The draft speaks of issues with replaying
the OSPF packets. One could also do these things with AH.

Am i missing something?

Jack

On Mon, Nov 16, 2009 at 11:47 AM, Joel Jaeggli <joelja () bogus com> wrote:
> Bill Fehring wrote:
> > On Sun, Nov 15, 2009 at 20:48, Joel Jaeggli <joelja () bogus com> wrote:
> > > Owen DeLong wrote:
> > > > I've never seen anyone use AH vs. ESP.
> > > OSPFv3?
> >
> > Maybe I'm asking a dumb question, but why would one prefer AH over ESP
> > for OSPFv3?
>
> Header protection... still doesn't provide replay protection, your
> mileage may vary
>
> http://tools.ietf.org/html/draft-ietf-opsec-routing-protocols-crypto-issues-02
>
> > RFC4552:
> > "In order to provide authentication to OSPFv3, implementations MUST
> > support ESP and MAY support AH."
> >
> > -Bill