Is it ok to combine both IPv4 and IPv6 protocol into single FW rule like this?
I've been using only IPv4 because my silly ISP currently allocate single /64 prefix to my connection. But today I decided to toy with IPv6 by giving that /64 PD to VLAN20. As consequence, I decided to convert all existing IPv4 rules to IPv4+6:
In above screenshot, VLAN10 and VLAN60 local subnets are IPv4 only. VPN_Routing is also the alias for IPv4 destination addresses.
Is it good idea to combine IPv4+6 for every rule like that?
Sure it is. Makes troubleshooting easier.
Web gui will guide you when you need to have separate rules for 4 and v6