[nsp] using /31s

[Jeff]

On Mon, 2004-02-09 at 14:30, Jeff wrote:
> > I'm missing a nugget of clue -
> > 
> > edge2(config)#interface Serial6/0/4:0
> > edge2(config-if)#ip address 216.23.183.248 255.255.255.254
> > Bad mask /31 for address 216.23.183.248
> > edge2(config-if)#ip address 216.23.183.249 255.255.255.254
> > Bad mask /31 for address 216.23.183.249
> > edge2(config-if)#ip address 216.23.183.250 255.255.255.254
> > Bad mask /31 for address 216.23.183.250
> > edge2(config-if)#ip address 216.23.183.251 255.255.255.254
> > Bad mask /31 for address 216.23.183.251
> > 
> > 216.23.183.0/24 is VSLM'd but has mostly /30s.  I have essentially two /30s
> > left (216.23.183.248/30, 216.23.183.252/30) and figured I'd double that with
> > /31s but I'm having issues with IOS accepting it.
> 
> I am not sure if you are being serious here, but a /31 is an invalid
> netmask.
> 
> It will only give you the network and broadcast, no actually usable IP
> Addresses.

Thank you all who have corrected me. I guess I should keep up with my
reading <G>

I have included some links that were provided to me to help those who
don't know about this yet:

http://www.ietf.org/rfc/rfc3021.txt?number=3031
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t2/ft31addr.htm

Thanks all who sent me mail and provided the information - now that I
have my foot out of my mouth, I can hopefully contribute something
helpful :)

Regards,
Jeff.