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--- linux:network [2011/12/03 04:08]
tkilla created
+++ linux:network [2021/03/11 02:20] (current)
tkilla [iperf]
@@ Line 1: / Line 1: @@
-====== Network HowTo & useful Commands ======
+====== Networking ======
+===== useful programs =====
+==== tcpdump ====
+Tcpdump prints out a description of the contents of packets on a network interface that match the boolean expression..
+Examples:
+  * dns:  $  tcpdump -i eth0 'udp port 53'
+  * http:  $ tcpdump 'tcp port 80'
+  * ftp:   $ tcpdump -i eth0 '(port 21 or 20)'
+==== mtr - mytraceroute ====
+mtmtr combines the functionality of the traceroute and ping programs in a single network diagnostic tool.r combines the functionality of the traceroute and ping programs in a single network diagnostic tool.
+==== iptraf ====
+iptraf  is  an  ncurses-based  IP LAN monitor GUI that generates various network statistics including TCP info, UDP counts, ICMP and OSPF information, Ethernet load info, node stats, IP checksum errors, and others...
+==== iftop ====
+iftop listens to network traffic on a named interface ... and displays a table of current bandwidth usage by pairs of hosts.
+-i     interface
+-p     Run in promiscuous mode
+-P     Turn on port display
+-F     net/mask  -- Specifies  a  network  for  traffic analysis
+==== iperf ====
+Measures the bandwith of a connections
+  iperf -c iperf.ovh.net -m -i 1 -t 10 -r
+It's usefull to check LAN Cables:
+Connect two computers with the cable, setup static IP Addresses and start iperf on both:
+Server mode on 1. box:
+  iperf -s
+Client mode on 2. box:
+  iperf -c <IP Address of box 1>
+In the results you get the Banwidth:
+  [  4] local <IP Addr node2> port 5001 connected with <IP Addr node1> port 2357
+  [ ID] Interval       Transfer     **Bandwidth**
+  [  4]  0.0-10.1 sec   6.5 MBytes   **305.2 Mbits/sec**

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