Commands tagged networking sorted by votes

Commands tagged networking (37)

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Listen on an arbitrary port

Simple way to test if a port is available to the public. Run this command on the "server" and run a `telnet host-ip port-number` on the client. Test by sending strings to the server, which will be displayed in the server terminal.
This is sample output - yours may be different.
0

nc -l <port-number>

cybertoast · 2013-03-20 15:25:57 6
What addresses are your applications talking to?

Shows which applications are making connections, and the addresses they're connecting to. Refreshes every 2 seconds (watch's default). Test on OSX, should work anywhere watch and lsof work. Show Sample Output
This is sample output - yours may be different.
```
         Finder         localhost:53255->localhost:26172
	imagent         mycomputer.foo.com:59319->qa-in-f125.1e100.net:5223
	imagent         mycomputer.foo.com:59339->bos-m015c-new-rdr2.blue.aol.com:443
	 Google         mycomputer.foo.com:58776->qc-in-f125.1e100.net:5222
	 Google         mycomputer.foo.com:60731->qa-in-f125.1e100.net:5222
	 Google         mycomputer.foo.com:60858->qc-in-f125.1e100.net:5222
	 Google         mycomputer.foo.com:60982->qc-in-f125.1e10
```
0

watch "lsof -i -P |grep ESTABLISHED |awk '{printf \"%15.15s \\t%s\\n\", \$1, \$9}'"

skarfacegc · 2013-04-03 02:04:11 5
Wake up a remote computer

Wakes up a computer on your LAN with a Wake-On-LAN packet. MAC Address must match the NIC MAC, computer must have WOL enabled in the BIOS. Show Sample Output
This is sample output - yours may be different.
```
Sending magic packet to 255.255.255.255:9 with 00:00:DE:AD:BE:EF
```
0

wakeonlan 00:00:DE:AD:BE:EF

tyzbit · 2014-06-13 16:16:33 8
Monitor iptables in realtime
This is sample output - yours may be different.
0

watch -n1 iptables -vnL

Creek · 2014-07-14 21:06:52 7
Find errors and packet loss on network cards

A grep against ethtool to look for common errors and packet loss statistics which network drivers report in their private data, which is queried with ethool -S. This is the current grep used in xsos (https://github.com/ryran/xsos), which I originally contributed and has been improved by the community over time. Show Sample Output
This is sample output - yours may be different.
```
    rx_fw_discards: 1035
```
0

ethtool -S eth0 | egrep "(drop|disc|err|fifo|buf|fail|miss|OOB|fcs|full|frags|hdr|tso).*: [^0]"

suprjami · 2014-07-15 05:27:34 7
List ethernet ports speed

It will list your machine's ethernet ports speed Show Sample Output
This is sample output - yours may be different.
```
eth0:   Speed: 1000Mb/s
eth1:   Speed: 1000Mb/s
eth2:   Speed: 10000Mb/s
eth3:   Speed: 10000Mb/s
```
0

for d in $(cd /sys/class/net && echo eth?) ; do echo "$d: $(ethtool $d |grep -w Speed)"; done

bassiek · 2014-12-28 15:47:46 8
An simple alias for providing an easier way to call netstat in ipv6 mode

This can be added to ~/.bashrc with your other shell aliases. Emulates similar look & feel to ping6 & traceroute6. Show Sample Output
This is sample output - yours may be different.
```
$ netstat6 -rn
Kernel IPv6 routing table
Destination         Next Hop      Flags Metric Ref    Use Iface
fd:1:2:3::/64       ::            U     256    1        0 eth0    
fe80::/64           ::            U     256    0        0 eth0    
::/0                fd:1:2:3::1   UG    1      10855    0 eth0    
::1/128             ::            U     0      1764     1 lo      
 
```
0

alias netstat6='netstat --inet6'

infranets · 2015-08-25 14:47:09 9
Bring down and delete a network bridge (eg: docker0)
This is sample output - yours may be different.
0

ip link set docker0 down && brctl delbr docker0

abn · 2015-12-11 09:05:29 9

check open ports (both ipv4 and ipv6)

This option selects the listing of all Internet and x.25 (HP-UX) network files. Show Sample Output

-1

lsof -i

shsingh · 2011-10-03 02:06:30 3

check open ports (both ipv4 and ipv6)

This option is much faster, as it checks only network nodes. Show Sample Output
This is sample output - yours may be different.
```
apache2   14485 www-data    8u  IPv4 186095222      0t0  TCP *:443 (LISTEN)
apache2   14770 www-data    4u  IPv4 186095213      0t0  TCP *:80 (LISTEN)
```
-2

lsof -Pi | grep LISTEN

5partan · 2011-10-03 12:50:18 3
Display live hosts on the network

Displays live hosts on the same network as the local machine with their hostnames and IP addresses. This command is IPv6 and multiple network adapter safe and does not rely on awk or sed, however it requires the "nmap" package installed. Might not work on OSX. Example alias for shell startup file: alias livehosts='nmap -sP "$(ip -4 -o route get 1 | cut -d " " -f 7)"/24 | grep report | cut -d " " -f 5-' Show Sample Output
This is sample output - yours may be different.
```
gateway.url (192.168.2.1)
host1.mynetwork (192.168.2.123)
host2.mynetwork (192.168.2.140)
192.168.2.147
host3.mynetwork (192.168.2.148)
192.168.2.187
192.168.2.190
host4.mynetwork (192.168.2.194)
```
-2

nmap -sP "$(ip -4 -o route get 1 | cut -d ' ' -f 7)"/24 | grep report | cut -d ' ' -f 5-

lordtoran · 2019-02-01 03:52:02 33
Print your local hostname with python

Show Sample Output
This is sample output - yours may be different.
```
brian.intranet.example.com
```
-3

python -c "import platform; print platform.node()"

keimlink · 2010-03-24 09:09:34 5
< 1 2

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Show all current listening programs by port and pid with SS instead of netstat

check open ports without netstat or lsof

Scan for [samba|lanman] NetBIOS names and ip addresses in LAN by ARP.

Reuse last parameter

Reuse the last parameter of the previous command line

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

easily strace all your apache *child* processes

Like the original version except it does not include the parent apache process or the grep process and adds "sudo" so it can be run by user.

Compose 2 images to 1

Compose 2 images (foreground.jpg with background.jpg) into 1 (image.jpg), the numeric parameters stablish the size of the foreground.jpg image (96x96) and the position x,y (+250+70) relative to the background.jpg image. Images can be any format, jpg, png, bmp, etc...

grep for minus (-) sign

Use flag "--" to stop switch parsing

Show current pathname in title of terminal

This helps to keep track of what is going on when you have several tabs open in your terminal. The title automatically changes when you change directories.

Remove all the files except abc in the directory

This is for zsh with extended globbing.

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Commands tagged networking (37)

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