WTH is up with this network config?

[Dan Irwin]

On Thu, Apr 29, 2010 at 9:15 AM, jack craig <jcraig at extraview.com> wrote:

> eth0      Link encap:Ethernet  HWaddr 00:26:18:FE:75:91
>           inet addr:10.0.0.100  Bcast:11.255.255.255  Mask:254.0.0.0
>           inet6 addr: fe80::226:18ff:fefe:7591/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:8291136 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:8464483 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:8084873362 (7.5 GiB)  TX bytes:8107599565 (7.5 GiB)
>           Interrupt:35

The address, broadcast address and netmask are all technically correct.

You should ignore what you know about classful addressing, and look up CIDR.

Your eth0 is in the network 10.0.0.0/7. The range of this network is
10.0.0.0-11.255.255.255. 10.0.0.0/8 is 10.0.0.0-10.255.255.255.

I can't think why anyone would have a single subnet containing approx
33 million ip addresses.

The only real downside I can see, is you won't be able to talk to any
"real" ip addresses in 11.0.0.0/8

Cheers,

Dan