ISC DHCPD giving out reserved IPs for non-reserved hosts

Glenn Satchell Glenn.Satchell at uniq.com.au
Mon Jul 9 14:17:01 UTC 2007


It's a configuration/implementation issue - it's nothing to do with the
standards or RFCs. I think there is some confusion over terminology
here.

In ISC dhcpd you specify a range of dynamically allocatable IP
addresses using the 'range' command. You specify fixed addresses using
the 'fixed-address' command within a 'host' statement.

You must ensure that your range does not overlap or contain any
fixed-address addresses. So this leads to things like:

subnet 1.2.3.0 netmask 255.255.255.0 {
  range 1.2.3.4 1.2.3.20;
  range 1.2.3.22 1.2.3.100;
  ...
}
host ... {
  fixed-address 1.2.3.21;
  ...
}



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