Cannot ping from your new Raspberry Pi with Raspbian PIXEL?

1 minute read

My newest Raspberry Pi 3 got a shiny new FLIRC case and therefore is now allowed to leave the home office and start a new career as a guest internet station in our living room. Thanks to the Wifi this was easier than expected, only one small problem came up:

Problem with ping command

I could not ping any IP address, whether outside or in our home. I got a strange message like this:

tobias@rpi06:~ $ ping
ping: icmp open socket: Operation not permitted

However I could browse the internet, log in from remote, and many other things, so what could be wrong?

Investigation showed that I could ping under root account or sudo:

tobias@rpi01 ~ $ sudo ping
PING ( 56(84) bytes of data.

but also from my other Raspberry Pi’s it worked fine - all of them running older versions of Raspbian.

tobias@rpi01 ~ $ ping
PING ( 56(84) bytes of data.
64 bytes from ( icmp_req=1 ttl=245 time=27.6 ms
64 bytes from ( icmp_req=2 ttl=245 time=27.5 ms


Looked like something different with the permissions, so I quickly investigated the difference. Found out that the working Raspberry had the Set-UID bit switched on for the ping command:

Old, working ok:

tobias@rpi01 ~ $ ls -l `which ping`
-rwsr-xr-x 1 root root 33220 Mar 30  2012 /bin/ping

Raspbian Pixel, not working:

tobias@rpi06:~ $ ls -l `which ping`
-rwxr-xr-x 1 root root 38844 Feb 12  2014 /bin/ping

Then the fix was as easy as

tobias@rpi06:~ $ sudo chmod u+s `which ping`

and it was looking better after that:

tobias@rpi06:~ $ ls -l which ping -rwsr-xr-x 1 root root 38844 Feb 12 2014 /bin/ping

And of coursse it also worked:

tobias@rpi06:~ $ ping
PING ( 56(84) bytes of data.
64 bytes from ( icmp_seq=1 ttl=245 time=35.0 ms
64 bytes from ( icmp_seq=2 ttl=245 time=36.2 ms


I hope this may be of help for some people out in the Internet, at least this note will serve as a reminder to myself when I get the next Raspberry Pi.

Meanwhile, feel free to let me know what you think in the comments below, or enjoy some of my cat videos

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