I deploy an Inbound ipsec VPN Server on ubuntu server 22.04 using ipv6 (public ip). I can successfully connect from my iPhone, but I can't go any where after connected.

I did changed below settings.

Change BetweenClients_DROP in config.cfg to false, and also consider changing block_smb and block_netbios to false;
If you want to use a DNS server on your LAN to resolve local domain names properly (e.g. a Pi-hole), set the dns_encryption flag in config.cfg to false, and change dns_servers to the local DNS server IP (i.e. 192.168.1.2).

thx