Manual:Packet Flow

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MikroTik RouterOS is designed to be easy to operate in various aspects of network configuration. Therefore creating limitation for individual IP or natting internal clients to a public address or Hotspot configuration can be done without the knowledge about how the packets are processed in the router - you just go to corresponding menu and create necessary configuration.

However more complicated tasks, such as traffic prioritization, routing policies, where it is necessary to utilize more than one RouterOS facility, requires knowledge: How these facilities work together? What happens when and why?

To address these questions we created a packet flow diagram.

Diagram

As it was impossible to get everything in one diagram, Packet flow diagram consist from 2 parts:

  • Bridging or Layer-2 (MAC)
  • Routing or Layer-3 (IP)


Packet Flow in Layer-2



Packet Flow in Layer-3


Analysis

Routed traffic

Bridged traffic

Examples

Example1: Bridging with use-ip-firewall=yes

Example2: Routing - from Ethernet to Ethernet interface

Example3: Routing from one Bridge interface to another

Example4: IPsec encryption and sending to the peer

Example5: IPsec data receiving and decryption