Bug 14361

Summary: udhcpc ignores T1 and T2 values
Product: Busybox Reporter: luke-jr+busyboxbugs
Component: NetworkingAssignee: unassigned
Status: NEW ---    
Severity: normal CC: busybox-cvs
Priority: P5    
Version: unspecified   
Target Milestone: ---   
Hardware: All   
OS: Linux   
Host: Target:
Build:

Description luke-jr+busyboxbugs 2021-11-20 00:17:12 UTC 
It seems the code just hard-coded T1 at half the lease time

https://git.busybox.net/busybox/tree/networking/udhcp/dhcpc.c?h=1_34_stable#n1802

Values provided by the DHCP server (opt 58, 59) just get ignored...

Use case: I issue 24 hour leases, and want the lease to be used that long if necessary (eg, if router is down), but I also want DHCP renewals every minute so: 1) I can rapidly give static IP leases and have the clients pick up on them; and 2) router reboots can quickly rebuild their lease table without persistent state.