netifd will immediately and automatically set an interface active/up
which has been administratively disabled with either the "ip link set $I
down" or "ifconfig $I down" commands.
Below is an example log after "ip link set eth0.1 down" is used against
the "lan" configuration/policy. Note that identical behavior is observed
on a typical ethernet interface (eth0) where there is no intermediate
switch or VLAN sub interfaces involved.
Sat Sep 11 00:39:59 2021 daemon.notice netifd: VLAN 'eth0.1' link is down
Sat Sep 11 00:39:59 2021 daemon.notice netifd: Interface 'lan' has link
connectivity loss
Sat Sep 11 00:39:59 2021 kern.info kernel: [48844.417075] device eth0
left promiscuous mode
Sat Sep 11 00:39:59 2021 daemon.notice netifd: lan (28106): udhcpc:
received SIGTERM
Sat Sep 11 00:39:59 2021 daemon.notice netifd: Interface 'lan' is now down
Sat Sep 11 00:39:59 2021 daemon.notice netifd: Interface 'lan' is disabled
Sat Sep 11 00:39:59 2021 daemon.notice netifd: Interface 'lan' is enabled
Sat Sep 11 00:39:59 2021 daemon.notice netifd: VLAN 'eth0.1' link is up
Sat Sep 11 00:39:59 2021 daemon.notice netifd: Interface 'lan' has link
connectivity
Sat Sep 11 00:39:59 2021 daemon.notice netifd: Interface 'lan' is
setting up now
Sat Sep 11 00:39:59 2021 daemon.notice netifd: lan (29997): udhcpc:
started, v1.30.1
Sat Sep 11 00:39:59 2021 kern.info kernel: [48845.042493] device eth0
entered promiscuous mode
Sat Sep 11 00:39:59 2021 daemon.notice netifd: lan (29997): udhcpc:
sending discover
Sat Sep 11 00:39:59 2021 daemon.notice netifd: lan (29997): udhcpc:
sending select for 192.168.0.148
Sat Sep 11 00:39:59 2021 daemon.notice netifd: lan (29997): udhcpc:
lease of 192.168.0.148 obtained, lease time 43200
Sat Sep 11 00:40:00 2021 daemon.notice netifd: Interface 'lan' is now up
Sat Sep 11 00:40:01 2021 user.notice firewall: Reloading firewall due to
ifup of lan (eth0.1)
Before I go into filing bugs or making a case for why this is a problem,
I should ask: Is this behavior intentional?
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