it runs out.
[ISC-Bugs #42452]
+- Add a new command line option, "-iu", to dhcrelay which allows one
+ or more interfaces to be regisetered to listen only for BOOTP replies.
+ [ISC-Bugs #41547]
+
Changes since 4.2.0 (new features)
- If a client renews before 'dhcp-cache-threshold' percent of its lease