class-C designation

[Peter Dambier]

Problem might be end user equipment and ISP routers.

At least some of the boxes seem to think in /24 networks and treat
each of them separately. I have never seen a x.x.x.0 or x.x.x.255
in my log.

Chance is you have been given two /24 that happen to live within
one and the same /23.

Probably you can use those .0 and .255 numbers internally but
their router wont let them through.

I have seen a router in the Cyberbunker (dont know its brand)
that did think in /24 only. It could do wild things. You could
use IPv4 addresses from different /24 on one and the same interface
but it would never allow .0 or.255. I could see it did broadcast
the .255

Hope that helps
Peter and Karin

Jim Pazarena wrote:
> I have just been assigned a /23 network.
> I am used to /24 and referring to it as a "class-C".
> Is there a name which may refer to a /23 network? Or must I simply
> refer to it a "two back-to-back class-C's" ?
> 
> Second question. In a /23, is it permissible for me to use the inner .255/.0 numbers?
> The telco told me I could not use them, but it doesn't make sense if indeed they
> have routed me a /23.
> 
> Thanks,
> Jim
> 


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Peter and Karin Dambier
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