Free network configurator software for linux

Network Configurator is a network configuration tool.
Network Configurator is user-level tool that aims to make network configuration more easy. It have command line and GTK+ interface.
Supported network types:
- Ethernet
- PPPoE
- PPTP
- Wi-Fi (no WEP and WPA for now)
- dialup

GNOME Configurator is a program for editing advanced GNOME settings in an easy way.
Edit advanced GNOME settings in an easy way. Currently has support for Metacity, Epiphany, Galeon, Panels, and Application Look and Feel.
Enhancements:
- Made the scrollbar settings actually work.
- Updated the French translation.
- Added support for setting the individual colors of the GTK+ theme.

/etc/net represents a new approach to Linux network configuration tasks. Inspired by the limitations of traditional configuration subsystems, /etc/net provides builtin support for configuration profiles, interface name management, removable device support, full iproute2 command set support, interface dependency resolution, and a QoS configuration framework.
/etc/net provides support for the following interface types: Ethernet, WiFi (WEP), IPv6/IPv6 tunnels, PSK IPSec tunnels, VLAN, PLIP, Ethernet bonding and bridging, traffic equalizer, Pent@NET, usbnet, and PPP. Due to its modular design, support for new interface types can be added without overall design changes.
Main features:
/etc/net provides builtin support for:
- configuration profiles
- interface name management
- removable devices
- full iproute2 command set
- interface dependencies resolution
- QoS configuration framework
- firewall support
/etc/net provides support for the following interface types:
- Ethernet
- WiFi (WEP)
- IPv4/IPv6 tunnels
- PSK IPSec tunnels
- VLAN
- PLIP
- Ethernet bonding and bridging
- traffic equalizer
- usbnet
- PPP (PPtP, PPPoE)
Enhancements:
- This release better matches the option set of /etc/net scripts 0.8.0.

Network Communicator is a simple script for sending and receiving data over TCP/UDP connections.
It can be useful for testing firewall configurations, routing tables, and similar things.
I had originally written two scripts for testing TCP only: a talker and a listener. Upon failure to properly modify them to support UDP only, I made Netcom. It allows the sending and receiving of TCP or UDP data to arbitrary IPs/Ports and optional from/to files.
Im sure there are already tools like this out there like netcat, but wasnt able to get netcat working properly for UDP also. Either way, here you go and enjoy!
Launch Netcom with no options to view the usage.
Enhancements:
- A complete re-write to support arbitrary source/destination and port forwarding (not tunneling).

This is a traffic generator. It is used to check what massive amounts of traffic of certain type will do to an intervening network.

It does not try to measure throughput or response times. It has been made with the question in mind: If 100 clients does simultaneous TCP transfers for 2 days, will my router break? Or can I configure my firewall while 50 people are doing large TCP transfers through the device?

Skipole Network Monitor project is a simple network monitor with built in web server.

It allows the user to input host IP addresses, it then pings these hosts every five minutes and displays their status via a built-in web server, on port 8000.

So calling http://your_pc_address:8000 will display pages showing green, yellow or red host or group symbols.

Each host is pinged four times every five minutes, and symbols are displayed as:

green : if three or four pings are successfull
yellow : if only one or two are successfull
red : if all four fail

As well as hosts, group symbols are displayed, and can be opened to show hosts, or sub-groups nested within. The operator can create groups, and sub-groups via the gui.

Jimsim Network Simulator project can emulate several routers connected via virutal networks. You can connect to the routers with your own favorite telnet program.
Connecting to the Virtual Routers
Use your favorite telnet program to connect to each of the virtual routers. For example:
For router 1 type:
C:>telnet localhost 10000
For router 2 type:
C:>telnet localhost 10001
For router 3 type:
C:>telnet localhost 10002
Network Layout
Currently the network is configured like this:
access-list [1-99] [permit/deny] [ ip wildcard-mask | host a.b.c.d | any ]
ip acccess-list [standard] [name]
ip access-group
show access-list
show ip interface
show ip interface brief
debug interface
encapsulation [hdlc,ppp] (serial interfaces only)
bandwidth
clock rate (serial interfaces)
interface loopback0
User commands:
?
enable
exit
ping ip
show cdp
show cdp neigh
show cdp neigh detail
show interface
show interface e0,eth0,etc
show ip route
show version
Enable commands:
clear counters
clear counters interface
config terminal
copy running startup
copy startup running
debug all
debug ip routing
debug ip eigrp
debug cdp
disable
exit
reload
show run
show startup
show ip eigrp neighbors
show ip eigrp topology
traceroute ip
undebug all
undebug ip routing
undebug ip eigrp
undebug cdp
Config commands:
cdp run
enable password password
end
hostname
banner motd delimiter
banner exec delimiter
banner login delimiter
ip route network netmask dest
interface e0,eth0,etc
bandwidth value
ip address addr netmask
description
cdp enable
shutdown
line con0, console0, console 0
login
login local
password passwd
router eigrp number
network a.b.c.d
service password-encryption
user username password password
Version restrictions:
- The EIGRP support is very basic. Just the network command for now. (Neighbors dont expire.) You can disable EIGRP with "no router eigrp process_id"
- The routing table isnt 100% correct. It doesnt summarize subnets. Nor does it understand multiple routes to the same destination. This will be fixed in the next version.
- Traceroute seems to count extra hops. Its counting each remote interface on a router as a hop. So, when you traceroute from router1 to router3, it counts router2 twice (once for 192.168.1.2 and 10.1.1.1)

NetCARD Config project helps linux users to configure network cards for two ip one for DSL network one for Local Network.