[c-nsp] which one is ugly

[Good One]

Thanks Gert. It seems you could not use 192.168.0.0/32 as loopback or 192.168.0.0/31 on a point to point interface. So all of Cisco's IOSs are treating class C ending with .0 as a whole /24 network instead of single IP route? What about JUNOS.. have you ever tried it on Juniper's JUNOS?
thanks
BR//Andrew

> Date: Sat, 11 Dec 2010 13:51:35 +0100
> From: gert at greenie.muc.de
> To: good1 at live.com
> CC: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] which one is ugly
> 
> Hi,
> 
> On Sat, Dec 11, 2010 at 08:27:28AM +0500, Good One wrote:
> > I was just thinking about using bla.bla.bla.0/32 (as a loopback
> > address) and bla.bla.bla.0/31 on some point to point interfaces.
> > Not sure which one is ugly and not useable at the moment. But would
> > love to hear from you guys...
> 
> Both are ugly.  It's IPv4, what do you expect?
> 
> Seriously: in theory, it should just work.  
> 
> If "bla" is from the former Class C space, though, there might be 
> some surprises in using the .0, as IOS has "helpful features" for the 
> "oh, you are talking about the whole Class C here?" case...
> 
> Cisco-XX>sh ip route 10.255.255.0
> Routing entry for 10.255.255.0/30
>   Known via "eigrp 99", distance 90, metric 157696, type internal
>   ...
>   (showing *just* the route that decides where the .0 goes to)
> 
> Cisco-XX>sh ip route 194.xx.129.0
> Routing entry for 194.xx.129.0/24, 19 known subnets
>   Attached (1 connections)
>   Variably subnetted with 3 masks
>   ...
>   (showing all subnets, not just "where would you route the .0 to?" - which
>   is especially annoying because the actual route for packets to ".0" is
>   not even showing up in this example's output, as the .0 would be part of 
>   the 194.97.128.0/23 supernet...)
> 
> 
> I'd *really* wish Cisco would notice that the days of Class C networks
> are gone, and that ".0" has no more or less special meaning in "former 
> Class C" space than in "the rest of the legacy IP address space"...
> 
> gert
> -- 
> USENET is *not* the non-clickable part of WWW!
>                                                            //www.muc.de/~gert/
> Gert Doering - Munich, Germany                             gert at greenie.muc.de
> fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de