For example, if you have a PC in the LAN and you want to go to on your browser, then the traffic is sourced from your PC, going via the router to server on the internet. Chain Forward: This means that the traffic that is traversing the MikroTik router and going to somewhere else.Those can be seen when you create a new filter rule on the firewall as the following: You have 3 chains in the Firewall of MikroTik RouterOS as the following: The chain is used in the firewall so the RouterOS can see on which way does he want to restrict the packets. When speaking about Firewall in MikroTik, you always have what is called as chain. RAW: drop or bypass packets before reaching the connection tracking.Mangle: to mark connections and/or packets.NAT: SRCNAT and DSTNAT to translate source and destination addresses.For instance, you can use the MikroTik RouterOS firewall to do the following: Those firewall functions are applied on the MikroTik RouterOS.
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