In my scenario, the firewall has an IPv4 address of 126.96.36.199 and a default route pointing to 188.8.131.52 (HSRP virtual address of R3 & R4).
The same interface on the firewall will be assigned a static IPv6 address of 2001:10D:13:200::8/64. Is HSRP for IPv6 the right solution to implement on R3 & R4 to provide an IPv6 gateway to the firewall? Please comment on my HSRP configuration.
according to my (modest) IPv6 level of knowledge you shouldn't need HSRP : each device including a simple host builds and updates a table of gateways present in the link by using information present in router advertisements: so if you enable/ don't disable RA on the two routers the firewall should be able to detect which is alive.
Probably for security reasons you have disabled the ICMPv6 on the firewall interface: if you cannot process the RAs you need to use something like HSRP for IPv6.
If you manage the lan switches and the ports are not in vlan1 you can think to be safe enough to leave RA enabled and accepted / processed on the firewall
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