On 01/03/13 14:15, Arthur Emerson III wrote:

> There are a gazillion people studying for their Cisco CCNA
> right now cringing when they see in writing the subnet mask
> of 255.255.255.254!  Per their textbook, the smallest *usable*
> subnet block is a /30, or mask 255.255.255.252.  Even on a
> point-to-point link, you still need an IP address for:
> 
> The network itself:         38.xxx.xxx.152
> Your host:                  38.xxx.xxx.153
> The remote host (gateway):  38.xxx.xxx.154
> Broadcast:                  38.xxx.xxx.155
> 
> This is where I'd start troubleshooting...

Drifting off topic, but RFC3021 allows /31 netmasks on point to point
links. Support varies from vendor to vendor, but /31s have been
supported in IOS since 12.0(14)S - 10+ years ago. You might want to look
at how old that CCNA textbook is...

-- 
 Robert Kerr




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