The nslookup command on UNIX and Linux may be used to get information about an IP address and tell you who it belongs to. This is very useful when using the Internet. This queries the DNS server and can tell you the domain name if any associated with the IP…
Read MoreTo view network traffic and then locate certain traffic that is hogging bandwidth, use the iftop utility. This is a great way to see what is going on in your network. Just install iftop. jason@Yog-Sothoth » ~ » $ sudo apt install iftop Then run it with this one-liner. jason@Yog-Sothoth…
Read MoreThis is yet another way to get the actual IP address of your Linux machine on a LAN. This returns just the IP address of your Linux computer. jason@jason-Lenovo-H50-55:~$ ip a | awk ‘/inet / { print $2 }’ | sed -n 2p 192.168.1.4/24jason@jason-Lenovo-H50-55:~$ ip a | awk ‘/inet /…
Read MoreGet your Internet routable IP address with the command line. [jason@localhost ~]$ curl ‘https://api.ipify.org’ ; echo[jason@localhost ~]$ curl ‘https://api.ipify.org’ ; echo Get the startup time of your Linux PC with Systemd. [jason@localhost ~]$ systemd-analyze Startup finished in 1.186s (kernel) + 9.653s (initrd) + 2min 37.144s (userspace) = 2min 47.984s[jason@localhost ~]$…
Read MoreTo get just the IP address of your Internet facing Linux machine, use this command. jason@jason-desktop:~/Documents/ipinfo/src$ curl icanhazip.comjason@jason-desktop:~/Documents/ipinfo/src$ curl icanhazip.com This will return just your IP address. This is another way to get this information. jason@jason-desktop:~/Documents$ curl ipinfo.io/ipjason@jason-desktop:~/Documents$ curl ipinfo.io/ip To get information about a DNS server, use the dig…
Read MoreThis command will add an IP route to the 172.29.59.1 router using the wlan0 wireless interface card on my laptop. jason@darknet:~$ sudo ip route add 0/0 via 172.29.59.1 dev wlan0jason@darknet:~$ sudo ip route add 0/0 via 172.29.59.1 dev wlan0 This is part of the process of creating a network connection…
Read MoreThis is how you find out the gateway IP address of your Linux machine on a LAN. I have executed the route -n command and I have this output. The UG flags on the IP address denote it as a gateway IP address. root@darknet:~# route -n Kernel IP routing table…
Read MoreThe ip command is a useful alternative to the ifconfig command and allows the user to manage network interfaces. This is a good way to use the command line to bring network interfaces up or down. In this example I am bringing the network interface down. [root@localhost jason]# ip link…
Read MoreThere are a few commands available in Red Hat Linux to get information about your network adapter. Here are a couple. The ifstat command returns information about the network throughput of your adapter. [jason@darknet ~]$ ifstat #kernel Interface RX Pkts/Rate TX Pkts/Rate RX Data/Rate TX Data/Rate RX Errs/Drop TX Errs/Drop…
Read MoreTo set an IP address on a VLAN on a Cisco switch, firstly access the configuration section for the VLAN in configuration mode. arya(config)#interface vlan 1arya(config)#interface vlan 1 Then the administrator may set an IP address for the VLAN. arya(config-if)#ip address 172.18.31.210 255.255.255.0arya(config-if)#ip address 172.18.31.210 255.255.255.0 Then you are all…
Read MoreTo scan a network for hosts using Kali Linux, the netdiscover command will come in handy. Just give it an IP address and it will find all hosts within that range. I am scanning for all hosts within the range of 172.29.59.1 to 172.29.59.254. root@kali:~/Documents# netdiscover -r 172.29.59.0/24 Currently…
Read MoreThis program will return the IP address of a specified network interface. Use the –ip parameter to get the IP. For example, this will show the IP address of an Ethernet interface: my-ip –ip eth0. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15…
Read MoreThis simple command will print out the Internet facing IP address of a Linux machine in no time. curl ifconfig.me/ipcurl ifconfig.me/ip This will return the useragent that is used to access this URL. ubuntu ~ $ curl ifconfig.me/ua curl/7.35.0ubuntu ~ $ curl ifconfig.me/ua curl/7.35.0 Use this string to get all…
Read MoreThis command will return only the IP address of the host. ubuntu ~ $ hostname -i 172.31.20.16ubuntu ~ $ hostname -i 172.31.20.16 Querying for all local IP addresses on the host. ubuntu ~ $ hostname -I 172.31.20.16 10.8.0.1ubuntu ~ $ hostname -I 172.31.20.16 10.8.0.1 This simple script will ping Google…
Read MoreAdding an IP address to the management interface of a Cisco switch allows connection over an Ethernet connection to manage the switch configuration. Firstly, switch to privileged exec mode. tyrion>en tyrion#tyrion>en tyrion# Then enter the configure terminal command to configure terminal settings. tyrion#configure terminaltyrion#configure terminal Now we are configuring settings…
Read MoreThe ip command will list all of your ip addresses when combined with the grep command to look for all inet words. This is a very useful one-liner. ubuntu ~/Documents $ ip a | grep "inet " inet 127.0.0.1/8 scope host lo inet 172.31.20.16/20 brd 172.31.31.255 scope global eth0 inet…
Read MoreThis command will lookup the network adapter that you are using and return the gateway IP address. jason@eyjafjallajkull:~$ arp -n | grep : | awk ‘{print $1}’ 10.10.0.1jason@eyjafjallajkull:~$ arp -n | grep : | awk ‘{print $1}’ 10.10.0.1 This looks for the : character that is in the MAC address…
Read MoreThis paper I found, PDF relates to the routing of network packets through a satellite connection. This might be very interesting to a student of networking who is interested in satellite networking and the unavoidable latency issues that come with such a connection. With a 250ms latency, this would add…
Read MoreTo send a SYN packet to a computer on a network, use this command. nmap -sS -v 192.168.1.10nmap -sS -v 192.168.1.10 If you want to send SYN packets to a range of IP addresses, this is the command to use. nmap -sS -v 192.168.1.10-100nmap -sS -v 192.168.1.10-100 This will send…
Read MoreGet your gateway IP address with curl on the command line. [homer@localhost ~]$ echo $(curl -# http://ipecho.net/plain) ######################################################################## 100.0% 153.107.97.164[homer@localhost ~]$ echo $(curl -# http://ipecho.net/plain) ######################################################################## 100.0% 153.107.97.164 Another way to list the IP addresses of your network interfaces. Using the ip command. [homer@localhost ~]$ ip a | grep inet*…
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