On the customer's network, a TP-Link router
is deployed and PPTP is configured at the remote end. However, the intermediate
AR160-S blocks PPTP packets. As a result, the connection fails.
PPTP packets to directly pass through without being processed.
CLI: Run the nat alg pptp enable command to enable the function.
Choose IP Service > NAT and select PPTP next to ALG
configuration in the Global Settings area.