Site2Site IPSec VPN with both endpoints only IPv6

Question

Hello, 
 I want to setup a S2S IPsec VPN between our Head office and Branch Office. The branch office has only IPv6. 
 I have setup on btoh side the S2S VPN, but i cant get it to connect. And i even dont see any connection trys in the logs. For all other S2S i see there some entrys. 
 Any ideas what is going wrong here?

Sreenivasulu Naidu · Answer

Hi, 
 I am assuming both Head office and Branch office has wan port with ipv6 address; In the ipsec config on both SFOS nodes, local gw should be picking up ipv6 address and remote gw can be ipv6 or dynamicDNS (FQDN) or it can be * on responder SFOS. Below config for reference.

Site2Site IPSec VPN with both endpoints only IPv6

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