which rewrites source IP address and/or port is called source NAT (src-nat) ip firewall filter add action=drop chain=input src-address-list=drop_trafficĪs there are 2 IP addresses and ports in an IP packet header, there are 2 types of NAT. ip firewall mangle add chain=prerouting protocol=tcp dst-port=23 action=add-src-to-address-list address-list=drop_traffic Additionaly, the address list will contain one static entry of address=192.0.34.166/32 (/ip firewall address-list add list=drop_traffic address=192.0.34.166/32 The following example creates an address list of people thet are connecting to port 23 (telnet) on the router and drops all further traffic from them. The address list records could be updated dynamically via the action=add-src-to-address-list or action=add-dst-to-address-list items found in NAT mangle and filter facilities. Firewall filter, mangle and NAT facilities can use address lists to match packets against them. Invalid – packet does not belong to any of the known connectionsįirewall address lists allow user to create lists of IP addresses grouped together.Established – packet belongs to an already known connection.Related – packet is also opening a new connection, but it is in some kind of relation to an already established connection.New – packet is opening a new connection.Connection state is a status assigned to each packet by conntrack system:.Protecting the customers from viruses and protecting the Internet from the customersĪdd chain=forward src-address=0.0.0.0/8 action=dropĪdd chain=forward dst-address=0.0.0.0/8 action=dropĪdd chain=forward src-address=127.0.0.0/8 action=dropĪdd chain=forward dst-address=127.0.0.0/8 action=dropĪdd chain=forward src-address=224.0.0.0/3 action=dropĪdd chain=forward dst-address=224.0.0.0/3 action=drop ip firewall filter add chain=input protocol=tcp dst-port=23 action=drop To deny access to router to the router via Telnet (TCP port 23).Protecting the router – allowing only necessaryservices from reliable source addresses with agreeable load. Every user-defined chain should subordinate to at least one of the default chains.forward – processes packets sent through the router.output – processes packets sent by the router.input – processes packets sent to the router.There are default and user-defined chains.Firewall filter rules are organized in chains.Sedikit catatan tentang istilah-istilah dalam MikroTik RouterOS Firewall, belum sempet ditranslate tapi mudah-mudahan ada gunanya.
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