I would like to check what ports are needed to establish a complete VPN and also to complete the connection to the GFTP Server.
What happened is , the VPN connection able to establish but as the corporate firewall has open 500/udp for this vpn connection, but when trying to connect to the GFTP Server using port 21/tcp or 22/tcp, it is not able to go through.
The UDP 500 (ISAKMP) port is used only for the first phase of the VPN tunnel.
Depending on your configuration you also need to open UDP 4500 (NAT-T port used for data traffic behind NAT systems), UDP 10000 (old NAT-T port used by Cisco sometimes) and IP 50 protocol (raw ESP packes when no NAT-T is negociated).
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...