Network Tuning
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Converted with HTML::WikiConverter::MediaWiki from my old phpwiki site
Links
- http://www.all-nettools.com
- NatTips
- Linux Advanced Routing & Traffic Control HOWTO et le même traduit en français
- Guide to IP Layer Network Administration with Linux
- IPsysctl tutorial
- Netfilter/iptables documentation
Bridges & Proxy-ARP
- Linux ethernet bridging
- Proxy-ARP mini howto (old one)
- Breaking a network in two with proxy ARP
- Proxy ARP Scripts
- ProxyARP Subnetting HOWTO
Traffic shaping
- TCP over WAN Performance Tuning and Troubleshooting
- The Wonder Shaper
- QoS Connection Tuning HOWTO
- IP Bandwidth Watchdog
- http://www.flynux.be/netfilter/
Tools
Iperf
Examples of a WET11 to WET11 communication:
apt-get install iperf
Server: (TCP & UDP via default port 5001)
iperf -s -D iperf -s -D -u
Client:
iperf -c 10.0.0.9 ------------------------------------------------------------ Client connecting to 10.0.0.9, TCP port 5001 TCP window size: 16.0 KByte (default) ------------------------------------------------------------ [ 5] local 10.0.0.136 port 1089 connected with 10.0.0.9 port 5001 [ ID] Interval Transfer Bandwidth [ 5] 0.0-10.1 sec 6.41 MBytes 5.30 Mbits/sec iperf -c 10.0.0.9 -u -b 100M ------------------------------------------------------------ Client connecting to 10.0.0.9, UDP port 5001 Sending 1470 byte datagrams UDP buffer size: 64.0 KByte (default) ------------------------------------------------------------ [ 5] local 10.0.0.136 port 1024 connected with 10.0.0.9 port 5001 [ ID] Interval Transfer Bandwidth [ 5] 0.0-10.0 sec 11.4 MBytes 9.59 Mbits/sec [ 5] Server Report: [ 5] 0.0-10.1 sec 7.70 MBytes 6.37 Mbits/sec 3.415 ms 2668/ 8157 (33%) [ 5] Sent 8157 datagrams
Interesting test:
iperf -c 127.0.0.1 ------------------------------------------------------------ Client connecting to 127.0.0.1, TCP port 5001 TCP window size: 49.3 KByte (default) ------------------------------------------------------------ [ 3] local 127.0.0.1 port 51547 connected with 127.0.0.1 port 5001 [ 3] 0.0-10.0 sec 3.99 GBytes 3.43 Gbits/sec iperf -c 127.0.0.1 -u -b 1G ------------------------------------------------------------ Client connecting to 127.0.0.1, UDP port 5001 Sending 1470 byte datagrams UDP buffer size: 103 KByte (default) ------------------------------------------------------------ [ 3] local 127.0.0.1 port 32769 connected with 127.0.0.1 port 5001 [ 3] 0.0-10.0 sec 941 MBytes 789 Mbits/sec [ 3] Sent 671249 datagrams [ 3] Server Report: [ 3] 0.0-10.0 sec 934 MBytes 785 Mbits/sec 0.000 ms 4831/671248 (0.72%) [ 3] 0.0-10.0 sec 1 datagrams received out-of-order
Looks like the kernel handles UDP much worsely than TCP!!
( tests done with a 2.6.15-1-686 )
4150 / mins = K/s
apt-get install iproute
Tests de ping sur www.ulg.ac.be
- NORMAL
round-trip min/avg/max = 13.9/18.3/23.9 ms
Tests avec download (wget -O /dev/null http://ftp.belnet.be/debian-cd/images/current/i386/debian-30r1-i386-binary-1.iso)
- DOWNLINK=2000 THEORETIC LIMIT
Download 1600 kbps
round-trip min/avg/max = 20.8/71.6/152.3 ms - DOWNLINK=800
Download 584 kbps
round-trip min/avg/max = 15.8/27.7/58.0 ms - DOWNLINK=1500
Download 1160 kbps
round-trip min/avg/max = 14.8/46.9/142.8 ms - DOWNLINK=1600
Download 1160 kbps
round-trip min/avg/max = 20.8/46.7/118.0 ms - DOWNLINK=2000
Download 1320 kbps
round-trip min/avg/max = 18.9/64.0/157.5 ms
Tests avec upload (scp /home/server/www/win98-v02.img dorian.homelinux.org:/dev/null)
- UPLINK=512 THEORETIC LIMIT
Upload 416.0 kbps
round-trip min/avg/max = 18.9/138.4/258.1 ms - UPLINK=220
Upload 207.2 kbps
round-trip min/avg/max = 14.5/38.7/72.4 ms - UPLINK=440
Upload 425.6 kbps
round-trip min/avg/max = 40.4/147.7/317.9 ms - UPLINK=400
Upload 381.6 kbps
round-trip min/avg/max = 14.9/43.5/80.3 ms
Bandwidth analysis
Ipband
Darkstat
Backport sur la Woody:
apt-get source darkstat (sur une Sarge) -> transfert sur la Woody cd darkstat-2.5 apt-get install autotools-dev libpcap-dev debian/control l10: debconf (>=1.2.9) -> (>=1.0.32) debian/rules binary cd .. dpkg -i darkstat_2.5-4_i386.deb editer /etc/darkstat/init.cfg /etc/init.d/darkstat start
Autres
- iptraf
- argus
- ntop