HP LaserJet 4345 Multifunction Printer series - Manual (Page 251)

b. Mac: Click Applications, click Utilities, and then open the Terminal application. The
terminal window opens.
2. Type
ping
followed by the IP address. For example, type
ping XXX.XXX.XXX.XXX
where "XXX.XXX.XXX.XXX" is the IP address that is shown on the HP Jetdirect
configuration page. If the MFP is communicating over the network, the response is a list
of replies from the MFP.
3. Verify that the IP address is not a duplicate address on the network by using the address
resolution protocol (arp -a) command. At the prompt, type
arp -a
. Find the IP address
in the list and compare its physical address to the hardware address that is listed on the
HP Jetdirect configuration page in the section called HP Jetdirect Configuration. If the
addresses match, all network communications are valid.
4. If you cannot verify that the MFP is communicating over the network, contact the
network administrator.
ENWW Solving network connectivity problems 237