Re: Request for review of DNS related draft

[Dean Anderson <dean@av8.com>]

This seems the wrong way to go about MGCP management activity. What makes
you think the first hop router will have anything to do with VOIP or MGCP?

In the VOIP networks that I've worked with (a number of large voip
installations since 1998), the first hop routers were never VOIP-aware at
all.

		--Dean

On Fri, 28 Feb 2003, Edward Warnicke wrote:

> Not everyone is privy to the routing tables.
>
> For example.  Imagine an MGCP call agent which wishes to
> perform a maintenance activity that requires the cooperation
> of the first hop gateway for an MGCP gateway.  I'm aware
> of no MGCP call agent which participates in the IGP for
> the networks containing those endpoints.  Additionally
> almost all IGPs will allow for some route summarization
> which would prevent me from actually knowing who the
> first hop gateway is in some circumstances.
>
> So in this example I would either have to provision the MGCP
> call agent with information about where the first hop gateway
> for each endpoint was, or allow it to use the method of the
> draft to resolve it.
>
> Since many of the environments where MGCP is seeing deployment
> have a very large number of endpoints, and an unusually large
> churn of first hop gateway changes ( think splitting a cable
> node ), as well as a tendency toward hierarchical distibution
> of control of the network, DNS resolution of this information
> seemed to make sense.
>
> The reason RFC 1101 doesn't get used for these sorts of
> purposes is that it doesn't support features in common use
> in these networks ( variable length subnet masks ).
>
> Ed
>
> On Fri, 28 Feb 2003, Robert Elz wrote:
>
> >     Date:        Thu, 27 Feb 2003 16:01:03 -0500
> >     From:        Ed Warnicke <eaw@cisco.com>
> >     Message-ID:  <3E5E7C8F.2000404@cisco.com>
> >
> >   | But DHCP will not allow a device which
> >   | is not the endpoint ( or the DHCP server ) to discover the network which
> >   | contains
> >   | an IP address and the first hop gateway(s) which service that network.
> >
> > Rather than how, perhaps the question should be why would anyone care?
> >
> > That's largely why 1101 never got used - the nodes for which it might
> > have provided information that could didn't already know it via other
> > means, never had much of a reason to care.
> >
> > Why would my nodes care what the network that contains some random IP
> > address might happen to be (or why would I ever care more than the
> > routing tables will tell me) ?
> >
> > kre
> >
> >
>
>
>
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