[TriLUG] OT: IP subnetting question

[David Black]

The three are

. Network address - all zeroes in the lower 2-4 bits as per your example
. Default router or gateway - sometimes the modem, sometimes bridged to a device on the provider side, the next hop for packets destined for somewhere other than that subnet
. Broadcast address - all ones in the lower bits

Dave

----- Original Message -----
> Hi Folks:
> 
> I just worked out a contract with a service provider for internet
> service.
> I noticed that they offered the following static IP packages:
> 
> /30, 1 useable address
> /29, 5 useable addresses
> /28, 13 useable addresses
> 
> My question is: For each of those, that leaves three "unuseable"
> addresses.
> What are they for?  I made some guesses:
> 
> - broadcast address (all ones)
> - ?????????         (all zeros) (does this have a name?)
> - Modem's own address
> 
> Thanks for the input!
> ~Brian
> 
> ------------------------------------------------------
>           Brian Henning, Software Engineer
> 
>     /\    Pine Research Instrumentation
>    //\\   5908 Triangle Drive
>   ///\\\  Raleigh, NC 27617
>  ////\\\\ USA
>     || 
>     ||    phone: 919.782.8320
>           fax:   919.782.8323
>           email: bhenning at pineinst.com
> ------------------------------------------------------
> 
> 
> 
> 
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