Default gateway address 0.0.0.0 (no, I don't mean 0.0.0.0/0)

[spottaaja1]

Hello!

I have a setup with two D-Link DWR-921 4G modems for multi-wan. I run them in "transparent proxy" mode to get my public IPs through to OpnSense. For this setup to work, I need to go in using ssh console and manually edit /conf/config.xml in order to set the gateway address for both modems to 0.0.0.0.

Don't really know the history of this, but apparently this is ok as per IPv4: "In the Internet Protocol version 4 the address 0.0.0.0 is a non-routable meta-address used to designate an invalid, unknown or non applicable target. To give a special meaning to an otherwise invalid piece of data is an application of in-band signaling." (see this: https://unix.stackexchange.com/questions/94018/what-is-the-meaning-of-0-0-0-0-as-a-gateway)

Of course I would not use this, but D-Link has chosen to implement their "transparent proxy" in a quirky way: it only passes the (DHCP) WAN IP address to OpnSense, not the WAN GW IP. So as a result, I have two WAN interfaces with gateway address 0.0.0.0 (which is fine by IPv4 I guess). This plays havok on multi-wan and gateway monitoring, perhaps the Dynamic DNS as well. The GUI cannot handle this situation either.

Would you guys consider working your magic to fix this? I can provide whatever log files you desire :)

[spottaaja1]

I've been reading more and it seems Windows and Linux can handle the 0.0.0.0 gateway faalback that OpenBSD (and OpnSense), it seems, cannot.