Manual:IP/Fasttrack

Applies to RouterOS: v6.29 +

Description

IPv4 FastTrack handler is automatically used for marked connections. Use firewall action "fasttrack-connection" to mark connections for fasttrack. Currently only TCP and UDP connections can be actually fasttracked (even though any connection can be marked for fasttrack). IPv4 FastTrack handler supports NAT (SNAT, DNAT or both).

Note that not all packets in a connection can be fasttracked, so it is likely to see some packets going through slow path even though connection is marked for fasttrack. Fasttracked packets bypass firewall, connection tracking, simple queues, queue tree with parent=global, ip traffic-flow(restriction removed in 6.33), ip accounting, ipsec, hotspot universal client, vrf assignment, so it is up to administrator to make sure fasttrack does not interfere with other configuration;

Requirements

IPv4 FastTrack is active if following conditions are met:

• no mesh, metarouter interface configuration;
• sniffer, torch and traffic generator is not running;
• no active mac-ping, mac-telnet or mac-winbox sessions restriction removed in 6.33;
• /tool mac-scan is not actively used;
• /tool ip-scan is not actively used;

Examples

Initial configuration

For example, in home routers with factory default configuration, you could Fasttrack all LAN traffic with this one rule placed at the top of the Firewall Filter. The same configuration accept rule is required:

/ip firewall filter add chain=forward action=fasttrack-connection connection-state=established,related
/ip firewall filter add chain=forward action=accept connection-state=established,related

Note, that this will break any filtering and Queues you apply for LAN traffic, you will have to mark traffic first, if you want to only fasttrack specific traffic.

This is how a default configuration looks with fastpath rule added on top (and auto-added dummy rule above it):

RouterBoard	Interfaces
RB6xx series	ether1,2
RB7xx series	all ethernets
RB800	ether1,2
RB9xx series	all ethernets
RB1000	all ethernets
RB1100 series	ether1-10,11
RB2011 series	all ethernets and sfp
CCR series routers	all ethernets and sfps
All devices	wireless interfaces, if wireless-fp or wireless-cm2 package used
	bridge interfaces (since 6.29)
	vlan, vrrp interfaces (since 6.30)
	bonding interfaces - rx only (since 6.30)