Site to Site VPN, One way traffic brings the VPn UP but not the other way.
I have configured the Site to site vpn between 2 ASA 5520 firewalls say site A and Site B. The problem is that.
If site A initiate the traffic, it brings the VPn up and both sites can communicate with each other.If site A stop the traffic then after 5 minutes if site B sends the traffic it dropped unless the site A sends the traffic. even one packet from site A allow the site B to communicate. This is a very strange problem never encountered before. your help in this case would be helpfull for me.
its mean vpn comes up, SITE B encrypts the traffic and forward to SITE A, but SITE A does not recieve it for any reason.
if i try to ping from SITE A to SITE B machine. then both are able to communicate. if i stop traffic for 5 minutes between these sites then after onwards the SITE B not able to communicate with SITE A unless Site A sends the traffic.
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...