External static ip setup as VirtualIP accepts traffic for 30 seconds and then stops

[prasket]

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Describe the bug

When using a VirtualIP on different Subnet than original StaticIP traffic works for 30 seconds then stops.

I was given a new StaticIP from a clients ISP which is on a different subnet than the original 2 static IPs. When I setup in the IP in VirtualIP settings the OPNSense Appliance sees traffic on all ports via filterlog but then 30ish seconds later NO traffic coming in.

I go update the VirtualIP staticip to /24 or /32 (been going back and forth) and then traffic works for 30 seconds. I can keep recreating this all day long with same results.

If I add a NAT PortForwarding for https ports in the 30seconds the webapp does serve but then stops.

To Reproduce

Steps to reproduce the behavior:

1. Go to 'Interfaces>VirtualIP'
2. Enter in your Static IP and save, and apply
3. Traffic works for 30ish seconds, then stops
4. Update setting in #2 changing from /24 to /32
5. Traffic starts coming in for 30ish seconds then stops
6. Rinse repeate

Expected behavior

Traffic to keep flowing in after VirtualIP is setup.

Describe alternatives you considered

Only other thing I could think of would be trying PFSense or something else ewe.

Software version used and hardware type if relevant, e.g.:

OPNsense 24.4.1-amd64 FreeBSD 13.2-RELEASE-p11 OpenSSL 3.0.14 Decisio DEC695 appliance

[prasket]

I was just testing with a curl command, issued command it was just waiting and waiting, made a change on the VirtualIP and as soon as I hit apply, the curl command completed/returned data.

[fichtner]

Check dmesg.

[prasket]

Nothing of note regarding the VirtualIP in the dmesg buffer. When I make a change to VirtualIP nothing shows in dmesg, only boot time things. I have rebooted a few times between changes as well to see if that helps but still getting same behavior.