[162094] in North American Network Operators' Group
Re: BCP38 tester?
daemon@ATHENA.MIT.EDU (Jay Ashworth)
Tue Apr 2 10:37:39 2013
Date: Tue, 2 Apr 2013 10:37:22 -0400 (EDT)
From: Jay Ashworth <jra@baylink.com>
To: NANOG <nanog@nanog.org>
In-Reply-To: <CAAAwwbXX7wg--_y297Q5KFOypwL7L5oGMpDZMfYsT4632mqVog@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
----- Original Message -----
> From: "Jimmy Hess" <mysidia@gmail.com>
> On 4/1/13, Jay Ashworth <jra@baylink.com> wrote:
> >> It would just be way too much luck and convenience for that to
> >> happen
> >> by coincidence.
> >
> > Once in a while, you win.
>
> The trouble with winning by coincidence or winning as a side-effect...
> Do you keep winning?
Depends on how you won.
> What happens with IPv6 CPE devices, when there is no NAT?
Well, that's going to be an interesting question in general:
will v6 edge routers a) exist, b) handle the addressing, c) handle
DHCP, d) actually not do NAT, or e) NAT a v4 home network to a v6
address/network?
> No translation occurs, so possibly rogue source IP packets get
> through, unless the device specifically applies uRPF or clamping
> source addresses to the LAN interface subnet.
>
> It would be nice if the RFCs specified Ingress filtering by default in
> router requirements for IPv4 and IPv6, as a MUST requirement; instead
> of some 2nd class citizen, optional best practices document.
Nah. That's *not* ingress filtering, for all practical purposes; it's
*egress* filtering -- filtering that's under control of the network
operating entity, and thus semi-useless for the purposes at hand.
(On re-reading that, I see I'm not entirely clear: any filtering has to
be done on the upsptream end of the link, so that it is *not* in control
of the entity which might be originating the bad packets; John Carmack
illustrated why in his piece about Quake cheating. What; you haven't
read that piece? And you run networks? :-)
Cheers,
-- jra
Cheers,
-- jra
--
Jay R. Ashworth Baylink jra@baylink.com
Designer The Things I Think RFC 2100
Ashworth & Associates http://baylink.pitas.com 2000 Land Rover DII
St Petersburg FL USA #natog +1 727 647 1274
