Manual:Packet Flow: Difference between revisions

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==Analysis==
==Analysis==


===Concepts===
===Basic Concepts===


[[Image:Input_interface.jpg|Input Interface|100px]]
[[Image:Input_interface.jpg|Input Interface|100px]] -


[[Image:output_interface.jpg|Output Interface|100px]]
[[Image:output_interface.jpg|Output Interface|100px]]
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===Configurable Facilities===
===Configurable Facilities===


[[Image:connection_tracking.jpg|Connection Tracking|100px]]
Each and every facilities in this section corresponds with one particular menu in RouterOS. Users are able to access those menu and configure these facilities directly
 
 
[[Image:connection_tracking.jpg|Connection Tracking|100px]] - '''/ip firewall connection tracking'''


[[Image:Filter_input.jpg|Filter Input|100px]]
[[Image:Filter_input.jpg|Filter Input|100px]]
[[Image:Filter_forward.jpg|Filter Forward|100px]]
[[Image:Filter_forward.jpg|Filter Forward|100px]]
[[Image:Filter_output.jpg|Filter Output|100px]]
[[Image:Filter_output.jpg|Filter Output|100px]] - '''/ip firewall filter'''


[[Image:src_nat.jpg|Source NAT|100px]]
[[Image:src_nat.jpg|Source NAT|100px]]
[[Image:dst_nat.jpg|Destination NAT|100px]]
[[Image:dst_nat.jpg|Destination NAT|100px]] - '''/ip firewall nat'''


[[Image:mangle_prerouting.jpg|Mangle Prerouting|100px]]
[[Image:mangle_prerouting.jpg|Mangle Prerouting|100px]]
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[[Image:mangle_forward.jpg|Mangle Forward|100px]]
[[Image:mangle_forward.jpg|Mangle Forward|100px]]
[[Image:mangle_output.jpg|Mangle Output|100px]]
[[Image:mangle_output.jpg|Mangle Output|100px]]
[[Image:mangle_postrouting.jpg|Mangle Postrouting|100px]]
[[Image:mangle_postrouting.jpg|Mangle Postrouting|100px]] - '''/ip firewall mangle'''


[[Image:global_in.jpg|Global-in HTB|100px]]
[[Image:global_in.jpg|Global-in HTB|100px]]
[[Image:global_out.jpg|Global-Out HTB|100px]]
[[Image:global_out.jpg|Global-Out HTB|100px]]
[[Image:Interface HTB.jpg|Interface HTB|100px]]
[[Image:Interface HTB.jpg|Interface HTB|100px]] - '''/queue simple''' and '''/queue tree'''


[[Image:IPsec_policy.jpg|IPSec_Policy|100px]]
[[Image:IPsec_policy.jpg|IPSec_Policy|100px]] - '''/ip ipsec policy'''


[[Image:use_ip_firewall.jpg|Use IP Firewall|100px]]
[[Image:use_ip_firewall.jpg|Use IP Firewall|100px]] - '''/interface bridge settings'''


[[Image:Bridge_forward.jpg|Bridge Forward|100px]]
[[Image:Bridge_forward.jpg|Bridge Forward|100px]]
[[Image:bridge_input.jpg|Bridge Input|100px]]
[[Image:bridge_input.jpg|Bridge Input|100px]]
[[Image:Bridge_output.jpg|Bridge Output|100px]]
[[Image:Bridge_output.jpg|Bridge Output|100px]] - '''/interface bridge filter'''


[[Image:Bridge_dst_nat.jpg|Bridge Destination NAT|100px]]
[[Image:Bridge_dst_nat.jpg|Bridge Destination NAT|100px]]
[[Image:Bridge_src_nat.jpg|Bridge Source NAT|100px]]
[[Image:Bridge_src_nat.jpg|Bridge Source NAT|100px]] - '''/interface bridge nat'''





Revision as of 14:01, 27 November 2008

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 for Mikrotik RouterOS v3.x was created in 2 parts:

  • Bridging or Layer-2 (MAC) where Routing part is simplified to one "Layer-3" box
  • Routing or Layer-3 (IP) where Bridging part is simplified to one "Bridging" box


Packet Flow in Layer-2



Packet Flow in Layer-3



Analysis

Basic Concepts

Input Interface -

Output Interface

Filter Output

Filter Output

Hotspot In

Hotspot Out

Configurable Facilities

Each and every facilities in this section corresponds with one particular menu in RouterOS. Users are able to access those menu and configure these facilities directly


Connection Tracking - /ip firewall connection tracking

Filter Input Filter Forward Filter Output - /ip firewall filter

Source NAT Destination NAT - /ip firewall nat

Mangle Prerouting Mangle Input Mangle Forward Mangle Output Mangle Postrouting - /ip firewall mangle

Global-in HTB Global-Out HTB Interface HTB - /queue simple and /queue tree

IPSec_Policy - /ip ipsec policy

Use IP Firewall - /interface bridge settings

Bridge Forward Bridge Input Bridge Output - /interface bridge filter

Bridge Destination NAT Bridge Source NAT - /interface bridge nat


Automated processes and desicions

Routing Adjustment

Accounting

TTL Adjustment

Bridge Decision

IPSec_Decryption

IPSec_Encryption

In-interface Bridge

Out-interface Bridge

Bridge Decision





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