On Mon, Mar 30, 2009 at 8:51 PM, Keith Moore <[email protected]> wrote:
> Tom Pusateri wrote:
>> So once you limit NAT for IPv6 to a 1:1 mapping (i.e. you no longer
>> share an address), then it seems like there's isn't a big advantage over
>> an application gateway.
>
> wtf?  application gateways have to be written for each protocol, whereas
> NATs do not (at least for those protocols that don't do referrals).
>
> that makes for a huge deployment mess.  it also breaks apps when the end
> points upgrade their protocols and the ALGs don't keep track.
>
> Keith
>
> (now if we're going to have NATs at all, I'm a big fan of having a
> standard signaling/control protocol that should work for all NATs.  but
> that's not the same as an application gateway)
>
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Actually I would imagine that most applications would just need a
"generic" TCP or UDP proxy.  In essence a /128 to /128 NAT, with ALGs.
 Doing this requires listing all traffic mappings that need to be
permitted.  A lot of work, but explicit allow with implicit deny would
make most of the security that I know more comfortable.  It would be
more like have VIPs for things that need them.

2 cents,
-Erik
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