Traffic shaping
Traffic shaping virker ved at jævne pakke-bursts i en trafikstrøm ud – eller med andre ord glatte de enkelte trafikstrømmes hastighedsvariationer ud:
Simpelt traffic shaping eksempel:
- Før traffic shaping: 10 pakker over et sek., 0 pakker over et sek., 10 pakker over et sek., 0 pakker over et sek.
- Efter traffic shaping: 1 pakke/0,2 sek.
Når mange trafikstrømme passerer en pakke flaskehals (logisk eller fysisk) er fordelene ved traffic shaping:
- Mindre pakkeforsinkelsesvariation (eng. jitter).
- Mindre pakketab.
On/off opførsel, især med hysterese, fremmer pakke-bursts:
- halv dupleks
- Port kø "flow"-control IEEE 802.3x.
Traffic shaping bliver ofte anvendt i kombination med:
Se også
redigérEksterne henvisninger
redigér- IT-world.com, Traffic Shaping Citat: "...Traffic shaping aims to decrease the burstiness of UDP and TCP traffic, thereby decreasing the load on the router and switch buffers as well as the latency jitter caused by long queues...."
- Network World, 03/05/01: Where should traffic shaping occur? Arkiveret 7. februar 2005 hos Wayback Machine
- Network World, 03/07/01: WAN-side traffic shaping Arkiveret 2. december 2008 hos Wayback Machine
- Traffic Shaping with Linux v2.4 and HTB qdisc Arkiveret 5. juni 2003 hos Wayback Machine
Lag 7 firewall/traffic shaper
redigér- Freeware, open source: Linux firewall-program: netfilter/iptables project homepage. The netfilter/iptables project. Kernet 2.6 iptables er en firewall med udvidelig NAT protokolunderstøttelse.
- Application Layer Packet Classifier for Linux Citat: "...This is a classifier for the Linux kernel's Netfilter subsystem that identifies packets based on application layer data (OSI layer 7). This means that it can classify packets as HTTP, FTP, Gnucleus, eDonkey2000, etc, regardless of port. Our classifier complements existing ones that match on route, port numbers and so on..."