system: allow polling when gateway monitor reports a gateway as down

[fichtner]

To fix cases where DHCP on WAN is not recovering due to modem being stubborn.

via: https://forum.opnsense.org/index.php?topic=9050.0 via: https://forum.opnsense.org/index.php?topic=9030.0

[saffrey]

+1 to this issue. Would like to know if there is a workaround that I can implement before the feature is included.

Cheers!

[fichtner]

As far as #5956 is concerned 2de4658ef0ccd6c05 teaches us that dhclient desperately needs a wrapper script to remove the cached IP and/or bring down the interface in order for it to be reconfigured later. Right now when dhclient exits and the link does not go down/up we don't have the chance to run any sort of post-dhcp hook to bring it back up.

[francois-pasquier]

I am experiencing flapping after getting disconnected and reconnected to Wan. ( I have to reboot opnsense to fix it)

Can you confirm it's one of the symptoms that should is included in this issue?

From what I gathered a lot of people are experiencing this and it was a "long time issue"

Thank's for the hard work!

[fichtner]

Flapping is the exact opposite of this problem. Here we never have flapping but dhclient exist at some point and we have no way of knowing. Link down/up actually correctly cycles dhclient.

[fichtner]

This might just work starting with 23.7.2 when default gateway switching is enabled, for details see #6728

[swhite2]

Situation doesn't appear to happen as often anymore, so closing the issue.