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;
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 sessionsrestriction removed in 6.33;
- /tool mac-scan is not actively used;
- /tool ip-scan is not actively used;
Fasttrack is supported on the listed devices.
|RB7xx series||all ethernets|
|RB9xx series||all ethernets|
|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|
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
This is how a default configuration looks with fastpath rule added on top (and auto-added dummy rule above it):
- Connection is FastTracked until connection is closed, timed-out or router is rebooted.
- Dummy rules will dissapear only after FastTrack firewall rules will be deleted/disabled and router rebooted.