[nsp] /30 over WAN links

[Church, Chuck]

If you're filtering bogons, it'll affect traceroutes.  Not a real big issue, though.

Chuck Church
CCIE #8776, MCNE, MCSE
Wam!Net Government Services
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 703-819-3495
cchurch at wamnetgov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.com

> -----Original Message-----
> From: Roman Volf [mailto:volfman at keystreams.com]
> Sent: Friday, February 06, 2004 2:34 PM
> To: limmer at core.com
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [nsp] /30 over WAN links
> 
> 
> Does anyone out there use private RFC1918 address for PTP links? Does 
> this break anything?
> 
> 
> Roman
> 
> Steve Lim wrote:
> 
> > Ah good question. And I think the question actually led me to an 
> > answer to my initial queries.
> >
> > I suppose if we think long term, where customers might have 
> changes in 
> > needs, it would make sense to number the WAN links with /30s. How 
> > messy would it be, if you began with a /29 or /28 over the WAN, and 
> > the customer's needs calls for more IPs? Worse, what if we started 
> > with a /27, and the customer downsized? What's the next 
> move? Renumber 
> > to a preferred prefix? Sucky. Perhaps routing additional 
> subnets would 
> > make sense, if you started of with a /29, and needed more. 
> But on the 
> > converse, renumbering a /29 to a /30 because the customer 
> has no need 
> > for the extra IPs, isn't the best idea. Especially if DNS and Email 
> > servers are on those IPs.
> >
> > So, I am concluding that if I number the WAN with the most 
> efficient 
> > subnet (a /30), I now have the option to add or subtract any size 
> > subnet per static routing. Simple, uncomplicated.
> >
> >
> > Many thanks all for the comments.
> >
> > SL
> >
> > Rubens Kuhl Jr. wrote:
> >
> >> Any scenario that would require or prefer numbered links nowadays ?
> >>
> >>
> >> Rubens
> >>
> >
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