[conspire] puzzled about printing port 9100 and guarddog

Peter Knaggs peter.knaggs at gmail.com
Sun Feb 12 15:00:29 PST 2006

On 2/12/06, Breen Mullins <bpm at idiom.com> wrote:
> You can get a greatly expanded services file from nmap.
> That file tells me that 9100 is for HP JetDirect cards.

Hi Breen,

Ahh, indeed, thanks!
Using Debian here, I see what you mean:
dpkg -L nmap|grep services
cat /usr/share/nmap/nmap-services|grep 9100
jetdirect         9100/tcp   # HP JetDirect card

The printer I'm using here is a Minolta 2300DL,
so I guess it just happens to use the same port
number as the HP printers.

I hadn't thought much about which port was
being used, until after enabling guarddog,
and remembering that I'd just cut'n'pasted
the 9100 port number from an HP configuration
I'd used before.


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