IPTraf

IPTraf is a console-based network statistics utility for Linux. It gathers a variety of figures such as TCP connection packet and byte counts, interface statistics and activity indicators, TCP/UDP traffic breakdowns, and LAN station packet and byte counts.

Features

• An IP traffic monitor that shows information on the IP traffic passing over your network. Includes TCP flag information, packet and byte counts, ICMP details, OSPF packet types.
• General and detailed interface statistics showing IP, TCP, UDP, ICMP, non-IP and other IP packet counts, IP checksum errors, interface activity, packet size counts.
• A TCP and UDP service monitor showing counts of incoming and outgoing packets for common TCP and UDP application ports
• A LAN statistics module that discovers active hosts and shows statistics showing the data activity on them
• TCP, UDP, and other protocol display filters, allowing you to view only traffic you’re interested in.
• Logging
• Supports Ethernet, FDDI, ISDN, SLIP, PPP, and loopback interface types.
• Utilizes the built-in raw socket interface of the Linux kernel, allowing it to be used over a wide range of supported network cards.
• Full-screen, menu-driven operation.

Protocols Recognized

• IP
• TCP
• UDP
• ICMP
• IGMP
• IGP
• IGRP
• OSPF
• ARP
• RARP

Non-IP packets will simply be indicated as “Non-IP” and, on Ethernet LAN’s, will be supplied with the appropriate Ethernet addresses.

Supported Interfaces

• Local loopback
• All Linux-supported Ethernet interfaces
• All Linux-supported FDDI interfaces
• SLIP
• Asynchronous PPP
• Synchronous PPP over ISDN
• ISDN with Raw IP encapsulation
• ISDN with Cisco HDLC encapsulation
• Parallel Line IP

The information generated by IPTraf can be valuable in making network organization decisions, troubleshooting LANs and tracking activity of various IP hosts.

IPTraf packages are also included in these Linux distributions (as far as I know):

• Debian
• S.u.S.E
• TurboLinux
• Red Hat Powertools
• Conectiva
• Trinux

(Source)

Here are some Screenshots of IPtraf in action under ubuntu. Remember you have to be a root in order to run IPtraf.

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