$ sudo dhclient -v -6
ng best lease.
PRC: X-- Initial candidate 00:03:00:01:0a:8c:18:55:69:af (s: 153, p: 255).
XMT: Forming Request, 0 ms elapsed.
XMT: X-- IA_NA 7a:c6:1d:24
XMT: | X-- Requested renew +3600
XMT: | X-- Requested rebind +5400
XMT: | | X-- IAADDR 2600:1f18:444f:1f01:9523:b874:32a1:f6fd
XMT: | | | X-- Preferred lifetime +7200
XMT: | | | X-- Max lifetime +7500
XMT: V IA_NA appended.
XMT: Request on eth0, interval 910ms.
RCV: Reply message on eth0 from fe80::88c:18ff:fe55:69af.