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Network commands

General considerations

We find these commands hard to work with, if they even work
This needs more study and trial and error testing

Show your IP

If you have access to a webserver you can run your own “show IP” service

General commands

CommandDescriptionRemark
adnshostA general-purpose DNS lookup utilityFrom the adns-tools package. Limited security support
adnslogresA logresolv programFrom the adns-tools package. Limited security support
adnsresfilterA filter which copies its input to its outputFrom the adns-tools package. Limited security support
ipshow / manipulate routing, devices, policy routing and tunnels
ip2hostResolve IP's to hostnames in webserver logs
iptraf-ngncurses interactive colorful IP LAN monitor
lsmLink connectivity monitor tool
ncatConcatenate and redirect socketsPart of nmap. Successor of netcat
net-toolsPackage containing arp, ifconfig, netstat, rarp, nameif and route
netcatConcatenate and redirect socketsSucceded by ncat
netdiagPackage containing tcpblast, netload, trafshow, netwatch, statnet, tcpspray
netstatIs replaced by ss
netstat-natShow the natted connections on a linux iptable firewall
NetworkManagerNetwork management daemon
nm-connection-editorThis starts the GTK window that can also be started from the system tray
nm-onlineAsk NetworkManager whether the network is connectedFind the answer with echo $? 0: Online; 1: Offline; 2: Error
nm-toolUtility to report NetworkManager state and devicesObsolete?
nmcliCommand-line tool for controlling NetworkManagerObsolete?
nmtuincurses tool to manage network connections
pingsend ICMP ECHO_REQUEST to network hostsping -4 -c 1 -q -w 3 &> /dev/null Only IPv$, only one ping, almost no output, quit after 3 seconds when no reply and discard all output. Useful in a script
sntoptop-like console network status toolShows if a website is up. In alarm or log mode a file is executed on the occurence of change in status of a given host
ssAnother utility to investigate socketsReplaces netstat which is deprecated. ss is part of the iproute2 package
systemctl restart networking
systemctl status network

Programs in the iproute2 package

CommandDescriptionRemark
arpd
iputils-arpingARP ping
bridge
ctstat
devlink
ip
lnstat
nstat
routef
routel
rtacct
rtmon
rtstat
ss
tc
tipc

Interfaces

CommandDescriptionRemark
dhclientDynamic Host Configuration Protocol ClientGeneral
ifdown
ifup
ifquery
ifconfigconfigure a network interfaceGeneral

Wireless LAN

CommandDescriptionRemark
iwshow / manipulate wireless devices and their configurationWiFi
iwconfigDeprecated and replaced by iw
iwlistGet more detailed wireless information from a wireless interfaceWiFi

Examples

CommandRemark
dhclient wlan0
nmcli dev wifi
iwlist wlan0 scan | grep -i ssid
iw dev wlan0 scan | grep SSID
ifconfig wlan0 up
ifdown eth0; ifup eth0
ip addrShow information for all addresses. Shows IP numbers of the host
ip link show wlan0
ip link show enp7s0
ip routeShow the routingtable and thereby the IP address of the router the host is connected to
ip set link eth0 downBring link eth0 down
ip set link eth0 upBring link eth0 up
iw wlan0 link
iw dev wlan0 station dumpiw dev wlan0 station dump Does the same
iw wlan0 disconnectDisconnects and reconnects automatically again
nmcli dev wifi connect SSID password SSID_pawsswordDoes not work at this moment
nmcli generalOutput: STATE CONNECTIVITY WIFI-HW WIFI WWAN-HW WWAN connected full enabled enabled enabled enabled
ifconfig wlan0 down
ifconfig wlan0 up
ifconfig -v eth0 192.168.1.6Assing IP address 192.168.1.6 to network interface eth0 and bring it up

File locations

FileFunction
/etc/networksHolds the local network addresses
/etc/network/interfacesavailable network interfaces
/etc/dhcp/dhclient.confConfiguration file for /sbin/dhclient
/etc/host.conf
/etc/hostnameHolds the hostname of the computer
/etc/hostsHolds the hostlist. See also hosts.allow hosts.deny
/etc/resolv.confDNS servers
/etc/NetworkManager/NetworkManager.conf

iw documentation
Network Configuration
Debian static IP address
How to connect to a WPA/WPA2 WiFi network using Linux command line


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network_commands.txt · Last modified: 27-11-2021 18:49 by wim