Comment 19 for bug 1447715

> The use case I found was in initramfs-tools, which recently SRU'd a change that uses dhclient to
> support 'ip=' command lines and dhcpv6.

aha, and busybox ip doesn't support the -tentative param that the ifupdown change uses.

+1 on fixing isc-dhcp then (as well as leaving this fix in ifupdown).