We have site to site VPN. using IPSEC/GRE. Centralised headend with several remote sites. One of the remote sites is connected but when I ping 347 Bytes or more to anything beyond the headend router i get less than 1% response. If I ping the headend router or other remote sites all is normal, any size is fine.
It was fine a few days ago, not aware of any config changes that might have caused it.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...