Mikrotik L2tp Server Setup Full Instant

/interface l2tp-server server set enabled=yes ipsec-secret=Very$tr0ngPSK use-ipsec=yes default-profile=l2tp-profile

Notes: ipsec-secret is the PSK clients must use. This setting auto-enables PPP service for L2TP.

Allow IPsec and L2TP traffic on your WAN interface (e.g., ether1 or pppoe-out1).

# Allow IPsec NAT traversal (UDP 4500)
/ip firewall filter add chain=input protocol=udp dst-port=4500 action=accept comment="IPsec NAT-T"
/ip firewall filter add chain=input protocol=ipsec-esp action=accept comment="IPsec ESP"
 mikrotik l2tp server setup full

If you have a default drop rule, ensure these accept rules are placed above it.

/ip ipsec proposal add name=l2tp-proposal enc-algorithms=aes-256-cbc auth-algorithms=sha256 pfs-group=none lifetime=30m

The first step in the setup is defining the IP addresses that will be assigned to VPN clients. These IPs exist in a virtual network space separate from the local LAN, though they must be routed to access local resources. If you have a default drop rule, ensure

Some implementations use GRE. It’s safe to allow:

/ip firewall filter add chain=input protocol=gre action=accept comment="Allow GRE for L2TP"

This is where most setups fail. You must allow IPsec and L2TP through the firewall and enable NAT for internet access.

Input Chain (Allow VPN traffic to the router): The first step in the setup is defining

/ip firewall filter add chain=input protocol=udp port=500,4500 action=accept comment="IPsec"
/ip firewall filter add chain=input protocol=ipsec-esp action=accept comment="IPsec ESP"
/ip firewall filter add chain=input protocol=udp port=1701 action=accept comment="L2TP"

Forward Chain (Allow VPN clients to access LAN/Internet):

/ip firewall filter add chain=forward src-address=192.168.100.0/24 action=accept comment="VPN to Any"

NAT (Masquerade for Internet access): Assuming your WAN interface is ether1 or pppoe-out1.

/ip firewall nat add chain=srcnat src-address=192.168.100.0/24 action=masquerade out-interface-list=WAN

/ip firewall filter add chain=forward src-address=192.168.100.0/24 dst-address=192.168.1.0/24 action=accept comment="VPN->LAN" /ip firewall filter add chain=forward src-address=192.168.1.0/24 dst-address=192.168.100.0/24 action=accept comment="LAN->VPN"