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: [email protected] > To: [email protected] > CC: [email protected] > 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 [email protected] > fax: +49-89-35655025 [email protected] _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
