Linux network tools

This is a small list of some really nice linux tools I recommend every sysadmin to have somewhere.

• dstat Combines vmstat, iostat, ifstat, netstat information and more http://dag.wieers.com/home-made/dstat/#documentation
• vnstat The best to monitor how much data was transfered tx/rxhttp://humdi.net/vnstat/
• iftop Amazing network bandwidth utility to analyse what is really happening on your eth http://en.wikipedia.org/wiki/Iftop
• netio Measures the net throughput of a network via TCP/IP http://freecode.com/projects/netio
• inq CLI troubleshooting utility that displays info on storage, typically Symmetrix. By default, INQ returns the device name, Symmetrix ID, Symmetrix LUN, and capacity ftp://ftp.emc.com/pub/symm3000/inquiry/
• send_arp Sends out an arp broadcast on the specified network device (defaults to eth0), reporting an old and new IP address mapping to a MAC address http://linux.die.net/man/8/send_arp
• EtherApe is a graphical network monitor for Unix modeled after etherman. Featuring link layer, IP and TCP modes, it displays network activity graphically http://etherape.sourceforge.net/
• iptraf An IP traffic monitor that shows information on the IP traffic passing over your network http://iptraf.seul.org/

NTOP HOWTO INSTALL
IFTOP HOWTO INSTALL
More complete Monitoring Tools List (older)
Other cool tools:

• netsniff-ng, a zero-copy analyzer, packet capturer and replayer itself supporting the pcap file format
• trafgen, a zero-copy wire-rate traffic generator
• bpfc, a Berkeley Packet Filter compiler
• ifpps, a top-like kernel networking statistics tool
• flowtop, a top-like netfilter connection tracking tool
• curvetun, a lightweight multiuser IP tunnel based on elliptic curve cryptography
• ashunt, an Autonomous System trace route utility