Technical data

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4. Packages

OPT_FTP FTP-Client

The ftp program can connect ﬂi4l to a FTP server to move ﬁles between the two of them.

FTP_PF_ENABLE_ACTIVE The setting FTP_PF_ENABLE_ACTIVE='yes' adds a rule to the

packet ﬁlter that enables initiated active FTP. For FTP_PF_ENABLE_ACTIVE='no' such a

rule has to be added to the PF_OUTPUT_%-array manually (if needed), for an example look

here (Page 66).

Passive FTP is always possible, neither this variable nor an explicit packet ﬁlter rule is

needed then.

OPT_IFTOP Netzwerküberwachung

The iftop program lists all active network connections and their throughput directly on

the ﬂi4l router.

After login to the router iftop is simply started by executing it on the console.

OPT_IMONC Text based control program for imond

This program is a text based frontend for the router to control imond.

OPT_IPERF Performance checks for the network

The command iperf can do performance measuring for networks. The program has to be

started on the two machines involved. On the iperf server execute

fli4l-server 3.10.1~# iperf -s

------------------------------------------------------------

Server listening on TCP port 5001

TCP window size: 85.3 KByte (default)

------------------------------------------------------------

to start. The server will wait for a connection from an iperf client then. Start the client

on the second machine with

fli4l-client 3.10.1~# iperf -c 1.2.3.4

------------------------------------------------------------

Client connecting to 1.2.3.4, TCP port 5001

TCP window size: 16.0 KByte (default)

------------------------------------------------------------

[ 3] local 1.2.3.5 port 50311 connected with 1.2.3.4 port 5001

[ ID] Interval Transfer Bandwidth

[ 3] 0.0-10.0 sec 985 MBytes 826 Mbits/sec

A performance check will start immedeately showing ﬁrst results. Some options can be

added to iperf, for details evaluate the informations on its homepage

http://iperf.sourceforge.net/.

OPT_NETCAT Transfer data to TCP based servers

OPT_NGREP A grep that is able to work directly with network devices.

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