Thanks, it starts now.
Does not really work for me, though. I used it to forward SSDP on 2.2.6, which worked fine. I setup a 2.2.6 VM to confirm that it still works there. Also tried an older 2.3 beta without the new changes and without CARP. Errors below are the same.
On 2.2.6 I get:
$ netstat -gn
IPv4 Virtual Interface Table
Vif Thresh Local-Address Remote-Address Pkts-In Pkts-Out
0 1 192.168.1xx.6 340 0
1 1 192.168.2xx.105 0 340
IPv4 Multicast Forwarding Table
Origin Group Packets In-Vif Out-Vifs:Ttls
192.168.1xx.11 239.255.255.250 100 0 1:1
192.168.1xx.31 239.255.255.250 12 0 1:1
192.168.1xx.30 239.255.255.250 134 0 1:1
192.168.1xx.245 239.255.255.250 42 0 1:1
192.168.1xx.36 239.255.255.250 12 0 1:1
192.168.1xx.246 239.255.255.250 40 0 1:1
on 2.3:
netstat -gn
IPv4 Virtual Interface Table
Vif Thresh Local-Address Remote-Address Pkts-In Pkts-Out
0 1 192.168.1xx.2 0 0
1 1 192.168.2xx.252 0 0
IPv4 Multicast Forwarding Table is empty
And many complaints in the log about LAN hosts not being in any vaild net for WAN upstream, which seems kind of odd to me.
The source address 192.168.1xx.245 for group 239.255.255.250, is not in any valid net for upstream VIF.
Firewall rules on 2.2.6 and 2.3 are set to allow all IGMP incoming on either LAN and WAN with IP options, so no difference there.