Best practice for defining static IP addresses?

[Todd Snyder]

I thought this very same thing until a few months ago, and after bashing
my head about for a while, I came here and was corrected.

Static assignments need to be outside any defined ranges.  This is
different than Windows DHCP, which lets you 'reserve' an ip in the
middle of range.

If you want to do the first option, you will have to define 2 ranges

range 10.119.14.1 10.119.14.99

and

range 10.119.14.101 10.199.14.179

Which isn't ideal.

Cheers,

Todd. 

-----Original Message-----
From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On
Behalf Of Ryan McCain
Sent: Tuesday, August 05, 2008 4:55 PM
To: dhcp-users at isc.org
Subject: Best practice for defining static IP addresses?

Lets assume this is my DHCP scope:

subnet 10.119.14.0 netmask 255.255.255.0 {
  range 10.119.14.1 10.119.14.179 ;
  option routers 10.119.14.254 ;

If I wanted to assign a static IP address, would I do?

host Black {
  hardware ethernet 00:19:5B:EC:A7:11;
  fixed-address 10.119.14.100;
}

or

host Heart {
  hardware ethernet 00:19:5B:EC:A7:12;
  fixed-address 10.119.14.200;
}

..Notice that 'Black' is within the defined range while 'Heart' is not.

I've always assume I could assign a static IP within the defined range
and the MAC address would act as a 'key' to prevent it from being handed
out  (even though it's in a defined range).   

Thanks for the clarification..








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