One to One NETMAP using Mikrotik Router

If we use private ip in our server and want to access that server from internet then we need to set 1 to 1 netmap bellow are the configuration of netmap, you just need to change the public IP, Private IP and WAN interface name as per your configuration.

say we have 4 public ip address 10.10.55.171 to 10.10.55.174
and we want to netmap private IP address 192.168.123.71 to 192.168.123.74


/ip address add address=10.10.55.171/32 interface=wan 
/ip address add address=10.10.55.172/32 interface=wan 
/ip address add address=10.10.55.173/32 interface=wan 
/ip address add address=10.10.55.174/32 interface=wan 

/ip firewall nat add chain=dstnat dst-address=103.10.55.171 action=dst-nat to-addresses=192.168.123.71
/ip firewall nat add chain=dstnat dst-address=103.10.55.172 action=dst-nat to-addresses=192.168.123.72
/ip firewall nat add chain=dstnat dst-address=103.10.55.173 action=dst-nat to-addresses=192.168.123.73
/ip firewall nat add chain=dstnat dst-address=103.10.55.174 action=dst-nat to-addresses=192.168.123.74

/ip firewall nat add chain=srcnat src-address=192.168.123.71 action=src-nat to-addresses=103.10.55.171
/ip firewall nat add chain=srcnat src-address=192.168.123.72 action=src-nat to-addresses=103.10.55.172
/ip firewall nat add chain=srcnat src-address=192.168.123.73 action=src-nat to-addresses=103.10.55.173
/ip firewall nat add chain=srcnat src-address=192.168.123.74 action=src-nat to-addresses=103.10.55.174


Best Regards

Nawshad Ahmed
www.mikrotikacademybd.com
Mikrotik Router OS Training in Bangladesh

DoS attack Protection

DoS attack Protection

• Limit incoming connections

Address with too much connections can be added to address list for blocking.

/ip firewall filter add chain=input protocol=tcp connection-limit=LIMIT,32 action=add-src-to-address-list  address-list=blocked-addr address-list-timeout=1d 

/ip firewall filter add chain=input protocol=tcp src-address-list=blocked-addr connection-limit=3,32 action=tarpit 

where LIMIT is max. number of connection per IP. LIMIT should be 100 or higher as many services use multiple connection (HTTP, Torrent, other P2P programs).

• Action tarpit

Instead of simply droping attackers packets(action=drop) router can capture and hold connections and with enough powerfull router is can kill the attacker.

www.mikrotikacademybd.com