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Project Notes


All about Address Resolution Protocol (ARP - RFC826) and installing arping on MacOS.


The arping utility sends an ARP REQUEST to a neighbour host. The Address Resolution Protocol (ARP - RFC826) is used to discover the link layer address (i.e. MAC address) for a given internet layer address, typically an IPv4 address.

Installing on MacOS

arping is available for installation with homebrew

brew install arping

The formula built, but is not symlinked into /usr/local
Could not symlink sbin/arping
/usr/local/sbin is not writable.

You can try again using:
  brew link arping
==> Summary
🍺  /usr/local/Cellar/arping/2.19: 6 files, 76KB

Note that it wasn’t able to link the binary in /usr/local/sbin

This is usually solved by ensuring the directory exists and set permissions:

sudo mkdir /usr/local/sbin
sudo chown -R `whoami`:admin /usr/local/sbin

Then links correctly:

$ brew link arping
Linking /usr/local/Cellar/arping/2.19... 2 symlinks created
$ export PATH=$PATH:/usr/local/sbin
$ which arping

Test Drive

$ arping -I en0 -c 2
42 bytes from 48:5a:3f:6f:6a:80 ( index=0 time=184.923 msec
42 bytes from 48:5a:3f:6f:6a:80 ( index=1 time=102.294 msec

--- statistics ---
2 packets transmitted, 2 packets received,   0% unanswered (0 extra)
rtt min/avg/max/std-dev = 102.294/143.608/184.923/41.314 ms

Credits and References

About LCK#196 tools
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This page is a web-friendly rendering of my project notes shared in the LittleCodingKata GitHub repository.

LittleCodingKata is my collection of programming exercises, research and code toys broadly spanning things that relate to programming and software development (languages, frameworks and tools).

These range from the trivial to the complex and serious. Many are inspired by existing work and I'll note credits and references where applicable. The focus is quite scattered, as I variously work on things new and important in the moment, or go back to revisit things from the past.

This is primarily a personal collection for my own edification and learning, but anyone who stumbles by is welcome to borrow, steal or reference the work here. And if you spot errors or issues I'd really appreciate some feedback - create an issue, send me an email or even send a pull-request.