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/ip pool add name=vpn-pool ranges=192.168.100.2-192.168.100.254 Next, create a DHCP-style server configuration for the VPN (this assigns IPs, DNS, and wins to clients):
/system logging add topics=l2tp,ipsec,debug action=memory Then view logs: mikrotik l2tp server setup full
/ip firewall filter add chain=input protocol=udp dst-port=4500 action=accept comment="IPsec NAT-T" Some implementations use GRE. It’s safe to allow: /ip pool add name=vpn-pool ranges=192
/ip firewall filter print If your default policy is drop , you must also allow established/related traffic: This increases latency but provides security
/ip firewall nat add chain=srcnat src-address=192.168.100.0/24 dst-address=192.168.88.0/24 action=accept comment="No NAT to LAN" But note: this requires return routes on your LAN devices or proper subnet routing. By default, all internet traffic from the VPN client will go through your MikroTik (full tunneling). This increases latency but provides security.
/ip firewall filter add chain=input protocol=udp dst-port=500,1701,4500 action=accept comment="Allow L2TP/IPsec" /ip firewall filter add chain=input protocol=ipsec-esp action=accept comment="Allow ESP (IPsec)" If your router is behind a NAT (even if it’s the first router, some ISPs use CGNAT), allow:
/ip pool add name=vpn-pool ranges=192.168.100.2-192.168.100.254 /ppp profile add name=l2tp-profile local-address=192.168.100.1 remote-address=vpn-pool dns-server=8.8.8.8,1.1.1.1 use-encryption=required /interface l2tp-server server set enabled=yes default-profile=l2tp-profile authentication=mschap2 max-mtu=1400 max-mru=1400 /ppp secret add name=john password=securepassword123 profile=l2tp-profile service=l2tp /ip firewall filter add chain=input protocol=udp dst-port=500,1701,4500 action=accept comment="L2TP/IPsec" /ip firewall filter add chain=input protocol=ipsec-esp action=accept comment="ESP" /ip firewall filter add chain=input protocol=gre action=accept comment="GRE" /ip firewall filter add chain=forward src-address=192.168.100.0/24 action=accept comment="VPN Forward"