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IPTraf User’s Manual. Copyright © , by Gerard Paul Java. Version 0 Preparing to Use IPTraf · Number Display Notations · Instances and Logging . iptraf is an ncurses-based IP LAN monitor that generates various network Frederic Peters ([email protected]), using iptraf –help General manual page. IPTraf User’s Manual IPTraf has a few optional command-line parameters. As with most UNIX commands, IPTraf command-line parameters are case-sensitive .

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Some unclosed connections may be due to extremely slow links or crashes at either end of the connection.

Over time, the entries will go out of order as counts proceed at varying rates. Iprraf system’s network interfaces must be named according to the schemes specified above. If the Source MAC addrs in traffic monitor option is not enabled, pressing M simply toggles between the counts and the packet and window sizes.

IPTraf User’s Manual

Packets coming from the internal network will be indicated as coming from the internal IP address that sourced them, and also as coming from the IP address of the external interface on your masquerading machine. That being the case, the system displays two entries for each connection, one for each direction of the TCP connection. Every machine has one, and has an IP address of UDP packets are also displayed in address: Cancelling will turn logging off for that particular session.

This does not determine how long it remains onscreen.


If an A is also present S-A-this is an acknowledgment of a previous connection request, and is responding. This is necessary because it can operate in promiscuous mode, and as such cannot determine the socket statuses for other machines on the LAN.

Therefore, eth0 refers to the first Ethernet interface, eth1 to the second, and so on. You may accept this default or change it. Direction entries also become available for reuse if an ICMP Destination Unreachable message is received for the connection. To minimize these entries, an entry is not added majual the monitor until a packet with data or a SYN packet is received. The sort operation compares the larger values in each connection entry pair and sorts the counts in descending order.

IPTraf 2 shows only the source host: Pressing S will display a box showing the available sort criteria. The direction entries for reset connections become available for new connections.

IPTraf User’s Manual

This is an acknowledgment of a previously received packet P PSH. If for some reason rvnamed cannot start probably due to improper installation or lack of memorymwnual you are on the Internet, and you enable reverse lookup, your keyboard control can become very slow.

On forwarding non-masquerading machines packets and TCP connections simply appear twice, one each for the incoming and outgoing interfaces. TCP connection endpoints are still indicated with the green brackets along the left edge of the screen. The source machine indicated in this direction reset the entire connection.

See the section on Background Operation below. See the Screen update interval This is the size of the IP datagram only, not including the data link header. See the Logging section below for detailed information on logging. Therefore, ppp0 is the first PPP interface, ppp1 is iltraf second, and so on. For all packets in the lower window, only the first IP fragment is indicated since that contains the header of the IP-encapsulated protocol but with no further information from the encapsulated protocol.


A request to push all data to the top of the receiving queue U URG. Window Manuall The advertised window size of the most recently received packet.

Sorting is not done automatically so as not to degrade performance. The M key displays more TCP information.

iptraf(8): Interactive Colorful IP LAN Monitor – Linux man page

The window contains these pieces of information: The default log file names will also be used if the -B parameter is used to run IPTraf in the background. When both directions of a connection are marked CLOSED, the entries they occupy become available for new connection entries. This applies to all facilities except the General Interface Statistics, which is still restricted to only one instance at a time.

This is because the traffic monitor cannot determine if a connection was already iphraf when it started. You can also press the F key to arbitrarily clear it at any time.