`journalctl -u netctl@xxx.service`:

[...]
Feb 12 18:19:22 hostname network[27282]: Starting network profile 'xxx'...
Feb 12 18:19:25 hostname dhcpcd[27391]: version 5.6.4 starting
Feb 12 18:19:25 hostname dhcpcd[27391]: enp4s5: sending IPv6 Router Solicitation
Feb 12 18:19:25 hostname dhcpcd[27391]: enp4s5: broadcasting for a lease
Feb 12 18:19:25 hostname dhcpcd[27391]: enp4s5: offered 192.168.1.155 from 192.168.1.1
Feb 12 18:19:25 hostname dhcpcd[27391]: enp4s5: acknowledged 192.168.1.155 from 192.168.1.1
Feb 12 18:19:25 hostname dhcpcd[27391]: enp4s5: checking for 192.168.1.155
Feb 12 18:19:29 hostname dhcpcd[27391]: enp4s5: sending IPv6 Router Solicitation
Feb 12 18:19:30 hostname dhcpcd[27391]: enp4s5: leased 192.168.1.155 for infinity
Feb 12 18:19:30 hostname network[27282]: Started network profile 'xxx'
Feb 12 18:19:33 hostname dhcpcd[27488]: enp4s5: sending IPv6 Router Solicitation
Feb 12 18:19:37 hostname dhcpcd[27488]: enp4s5: sending IPv6 Router Solicitation
Feb 12 18:19:37 hostname dhcpcd[27488]: enp4s5: no IPv6 Routers available
-- suspend --
Feb 12 18:20:07 hostname dhcpcd[27488]: enp4s5: carrier lost                               <
Feb 12 18:20:07 hostname dhcpcd[27488]: enp4s5: carrier acquired                           <
Feb 12 18:20:07 hostname dhcpcd[27488]: enp4s5: sending IPv6 Router Solicitation           <
Feb 12 18:20:07 hostname dhcpcd[27488]: enp4s5: rebinding lease of 192.168.1.155           <
Feb 12 18:20:11 hostname dhcpcd[27488]: enp4s5: sending IPv6 Router Solicitation           < -- no connection
Feb 12 18:20:12 hostname dhcpcd[27488]: enp4s5: broadcasting for a lease                   <
Feb 12 18:20:15 hostname dhcpcd[27488]: enp4s5: sending IPv6 Router Solicitation           <
Feb 12 18:20:19 hostname dhcpcd[27488]: enp4s5: sending IPv6 Router Solicitation           <
Feb 12 18:20:19 hostname dhcpcd[27488]: enp4s5: no IPv6 Routers available                  <
[...]