Commands tagged Network sorted by votes

Commands tagged Network (129)

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Generate random valid mac addresses

Python Alternative Show Sample Output
This is sample output - yours may be different.
```
2a:27:2a:1d:22:0a
37:3d:c9:c8:09:97
...
```
1

python -c "from itertools import imap; from random import randint; print ':'.join(['%02x'%x for x in imap(lambda x:randint(0,255), range(6))])"

ohe · 2010-12-08 11:02:16 5
count of down available ips
This is sample output - yours may be different.
1

nmap -v -sP 192.168.10.0/24 | grep down | wc -l

unixmonkey16033 · 2011-01-03 21:33:02 3
count of down available ips

avoid wc overload ;)
This is sample output - yours may be different.
1

nmap -v -sP 192.168.10.0/24 | grep -c down

ioggstream · 2011-01-04 11:20:27 4
live netcat network throughput test

On the another machine write this command. pv -r /dev/zero | nc 192.168.1.1 7777 It will show live throughput between two machine.The destination machine ip is at our example 192.168.1.1 You must multiply by 8 for the network calculation. You must install pv and netcat commands for this commands usage. kerim@bayner.com http://www.bayner.com/ Show Sample Output
This is sample output - yours may be different.
```
[11.3MB/s]
```
1

nc -l -p 7777 > /dev/null

kerim · 2011-01-24 00:06:45 5
Watch RX/TX rate of an interface in kb/s

A shorter version Show Sample Output
This is sample output - yours may be different.
```
in:    462.78           out:     11.38
```
1

while cat /proc/net/dev; do sleep 1; done | awk '/eth0/ {o1=n1; o2=n2; n1=$2; n2=$10; printf "in: %9.2f\t\tout: %9.2f\r", (n1-o1)/1024, (n2-o2)/1024}'

quadcore · 2011-03-26 02:52:14 3

Lists all listening ports together with the PID of the associated process

Lists all opened sockets (not only listeners), no DNS resolution (so it's fast), the process id and the user holding the socket. Previous samples were limiting to TCP too, this also lists UDP listeners. Show Sample Output

netstat -anpe

anarcat · 2011-12-06 18:27:09 3

Get your external IP address ( 10 characters long )

Shortest url to a external IP-service, 10 characters. Show Sample Output
This is sample output - yours may be different.
```
victor@crunchbang:~$ curl ip.nu
<html>
	<head>
		<title>ip</title>
	</head>
	<body>
		Your IP address is *.228.*.127
	</body>
</html>
```
1

curl ip.nu

VictorBjelkholm · 2012-04-08 19:43:36 3
Check the status of a network interface

no need for installing mii-tools, all generic tools working under archlinux. Show Sample Output
This is sample output - yours may be different.
```
eth0: up
lo: unknown
```
1

for i in `ls /sys/class/net/`; do echo $i: `cat /sys/class/net/$i/operstate`; done

dragonauta · 2012-10-15 18:20:37 4
Remote Serial connection redirected over network using SSH

Requires software found at: http://lpccomp.bc.ca/remserial/ Remote [A] (with physical serial port connected to device) ./remserial -d -p 23000 -s "115200 raw" /dev/ttyS0 & Local [B] (running the program that needs to connect to serial device) Create a SSH tunnel to the remote server: ssh -N -L 23000:localhost:23000 user@hostwithphysicalserialport Use the locally tunnelled port to connect the local virtual serial port to the remote real physical port: ./remserial -d -r localhost -p 23000 -l /dev/remser1 /dev/ptmx & Example: Running minicom on machine B using serial /dev/remser1 will actually connect you to whatever device is plugged into machine A's serial port /dev/ttyS0.
This is sample output - yours may be different.
1

remserial -d -p 23000 -s "115200 raw" /dev/ttyS0 &

phattmatt · 2012-11-19 17:56:02 5
Get the IP address of a machine. Just the IP, no junk.

Why use many different utilities all piped together, when you only need two? Show Sample Output
This is sample output - yours may be different.
```
127.0.0.1
10.80.86.3
```
1

ip -o -4 addr show | awk -F '[ /]+' '/global/ {print $4}'

atoponce · 2013-04-09 16:34:39 9
tcpdump whole packets to file in ascii and hex with ip adresses instead of hostname
This is sample output - yours may be different.
1

tcpdump host <IP> -nXXv -s0 -w file.pcap

harpo · 2013-09-04 07:24:04 28
Get a summary of network devices in the system

Basically an improvement on an earlier ethtool command line. Show Sample Output
This is sample output - yours may be different.
```
# eth0
	Speed: Unknown! (65535)
	Link detected: no
# eth1
	Speed: 100Mb/s
	Link detected: yes
# lo
	Link detected: yes
# pan0
	Link detected: yes
# tap1
	Speed: 10Mb/s
	Link detected: no
```
0

for i in /sys/class/net/*; do e=`basename $i`; echo "# $e"; sudo ethtool $e | grep -E "Link|Speed" ; done

hank · 2009-04-25 14:32:08 10
Get your external IP address
This is sample output - yours may be different.
0

wget -qO - http://www.sputnick-area.net/ip;echo

cfajohnson · 2009-11-20 23:10:31 4
Get current connected wireless network with nm-tools

Gets only when the state is connected.
This is sample output - yours may be different.
0

nm-tool 2>/dev/null|sed -n '/Type:[ ]*802.11 WiFi/,/IPv4 Settings/{ /State:[ ]*connected/,/IPv4 Settings/{ s/^[ ]*//;/^\*.*Infra/ { s/^*//;s/:.*//;p }}}'

chmouel · 2010-02-02 12:04:12 3
List alive hosts in specific subnet
This is sample output - yours may be different.
0

for ip in `seq 1 255`; do ping -c 1 192.168.1.$ip ; done | grep ttl

takeshin · 2010-06-05 13:15:06 4
Create a tunnel from a remote server to the local machine using a specific source port

It connects to XXX.XXX.XXX.XXX port YYY, using a source port of "srcport" and binds the tunnel on local port "locport". Then you can connect to localhost:locport. With this command it's possible to connect to servers using a specific source port (useful when a firewall check the source port). Because of the connections starting from the same source port, this works well only for the first connection (for example, works well with SSH and bad with HTTP because of multiple requests). * It requires socat Show Sample Output
This is sample output - yours may be different.
```
cyrus@OMGWTF:~$ socat TCP-LISTEN:3333,fork TCP:192.168.2.2:80,sourceport=12345
```
0

socat TCP-LISTEN:locport,fork TCP:XXX.XXX.XXX.XXX:YYY,sourceport=srcport

cyrusza · 2010-11-22 13:24:33 4
Generate random valid mac addresses

You have to install the package macchanger but this command will create a random mac from a list of known manufacturers. If you want to make a complete random mac, use the -r option .
This is sample output - yours may be different.
0

macchanger -A (nic)

pebkac · 2010-12-07 20:22:54 3
Watch RX/TX rate of an interface in kb/s
This is sample output - yours may be different.
0

while :; do OLD=$NEW; NEW=`cat /proc/net/dev | grep eth0 | tr -s ' ' | cut -d' ' -f "3 11"`; echo $NEW $OLD | awk '{printf("\rin: % 9.2g\t\tout: % 9.2g", ($1-$3)/1024, ($2-$4)/1024)}'; sleep 1; done

DerksIT · 2011-03-22 10:23:33 3
Get your external IP address

JSON version. Additionally it may give your geolocation if it's known by hostip.info Show Sample Output
This is sample output - yours may be different.
```
{
 "host": {
  "ipv4": "188.165.241.33",
  "hostname": "ns390090.ovh.net",
  "address": {
    "city":"Roubaix",
    "country":"FRANCE (FR)",
    "geo": {
     "latitude":50.7,
     "longitude":3.1667
   }
  }
 }
}
```
0

curl http://my-ip.cc/host.json

samleb · 2011-09-01 00:31:49 3
To know the IP address of the machine current running on the network

Prevents the need for the grep & awk statements. Sort is optional if you don't care about the output order. The network range can also be specified as in the original post. -A Display targets by address rather than DNS name. (Probably unnecessary...) -a Show systems that are alive. S fping -r1 -ag 192.168.nnn.0/24 2>/dev/null Without sorting... Show Sample Output
This is sample output - yours may be different.
```
fping -r1 -Aag 192.168.nnn.0/24 2>/dev/null | sort -gt. -k4
192.168.nnn.110
192.168.nnn.220
192.168.nnn.231
192.168.nnn.241
```
0

fping -r1 -Aag <network>/<cidr_mask> 2>/dev/null | sort -gt. -k4

SuperJC · 2011-12-21 22:38:51 3

scan subnet for used IPs

Does a ping scan on the local subnet and returns the IPs that are up Show Sample Output

nmap -T4 -sn 192.168.1.0/24

drewbled · 2012-06-19 17:07:24 3

Flush DNS

Flush the DNS cache under Ubuntu (Debian?)
This is sample output - yours may be different.
0

sudo /etc/init.d/dns-clean

varghjarta · 2012-08-06 18:40:49 10
What is my ip?

looks at html for "ip" (it's a CSS class), then a little of cut and egrep to get IPv4 address. I use this oneliner into conky. Show Sample Output
This is sample output - yours may be different.
```
190.192.21.165
```
0

curl -s mi-ip.net | grep '"ip"' | cut -f2 -d ">" | egrep -o '[0-9.]+'

dragonauta · 2012-10-15 16:48:20 4
Test against loopback address with the 0.0.0.0 default route.

Super fast way to ftp/telnet/netcat/ssh/ping your loopback address for testing. The default route 0.0.0.0 is simply reduced to 0. Show Sample Output
This is sample output - yours may be different.
```
$ ping 0
PING 0 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.497 ms

$ telnet 0 22
Trying 0.0.0.0...
Connected to 0 (0.0.0.0).
Escape character is '^]'.
SSH-2.0-OpenSSH_4.3
```
0

telnet 0 <port>

somaddict · 2012-11-16 03:38:49 4
extraer la MAC del comando ifconfig
This is sample output - yours may be different.
0

ifconfig eth0 | grep HW | cut -d " " -f 11

davidnamy · 2012-12-04 10:18:22 3
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Easily run a program in the background without losing output

This function runs a program in the background, and logs all output to an automatically created logfile. That way, you can still get at the output without it clogging up your terminal. Tip: Throw fork() and this: $for prog in firefox kate konqueror ;do alias $prog="fork $prog";done into your bashrc, so that they'll automatically run out of the way.

View an info page on a nice interface

Nice interface for an info page.

kill a process(e.g. conky) by its name, useful when debugging conky:)

Join the content of a bash array with commas

$ DOCKER_APP_VARS=(DATABASE_USER=dbuserro, DATABASE_PASSWORD=maipass) [jeff@omniscience container] (master)$ echo docker run $(printf -- " -e %s" ${DOCKER_APP_VARS[*]}) -name 12factorapp mattdm/fedora-small docker run -e DATABASE_USER=dbuserro, -e DATABASE_PASSWORD=maipass -name 12factorapp mattdm/fedora-small Note that the printf method by itsself doesn't include a newline (\n), so you'll need to embed it into an echo statement or something that does.

exit if another instance is running

runs only one instance.

Install pip with Proxy

Installs pip packages defining a proxy

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Convert from octal format to umask

Umask is obtained subtracting 7 from each cypher of octal format. I store octal perm format in an array,then for each element of array I subtract 7. The result is the umask.

shush MOTD

I'm annoyed by the boilerplate "don't login unless you are supposed messages in our environment" - this shuts them up.

Mount a VMware virtual disk (.vmdk) file on a Linux box

Assumes XP/2000/2003. For Server 2008+ try offset=105,906,176 You can find this number in the System Information utility under Partition Starting Offset. UEFI based boxes you want partition 2 since the first is just the boot files (and FAT). This works with (storage side) snapshots which is handy for single file restores on NFS mounted VMware systems

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Commands tagged Network (129)

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