Draytek Vigor VPN is up but no traffic

Change VPN MTU

Step 1: Access Web Console

Step 2: Change MTU VPN to 1200

1 -> PPTP
2 -> L2TP
3 -> IPsec
4 -> L2TP over Ipsec
5 -> GRE over Ipsec
6 -> SSL Tunnel

Ex

vpn mss set 1 1200

vpn mss set 2 1200

vpn mss set 3 1200

vpn mss set 4 1200

vpn mss set 5 1200

sys commit
sys reboot

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