[SOLVED] My printer has two MAC addresses

turboscrew · 09-01-2018, 04:23 AM

This is kind of printer question, but has maybe more to do with networking.

I have been wondering why does my printer have two DHCP entries?
192.168.0.100 a0:28:ed:85:2f:73 NPIB88B68 2018/08/26 13:20:59 - 2018/08/27 01:20:59
192.168.0.104 30:e1:71:b8:8b:68 NPIB88B68 2000/01/01 00:00:42 - 2000/01/01 12:00:42

From the first, nmap found no life (but it's always there).
From the second, nmap found 7 services, but the entry disappears when the printer goes to sleep.

What could this first entry be?

I tried to send "wake on lan" to both interfaces, but that doesn't seem to wake up the printer.

The printer is HP_Color_LaserJet_MFP_M277dw (in case it matters).

business_kid · 09-01-2018, 04:54 AM

I've a HP Laserjet Professional P1102w; It's a cheap crappy laser mono - exactly what I need.
It actually has A DHCP SERVER in there, which caused confusion at some point, because I already had a dhcp server on the network. But if I got things up in the wrong order with the printer on, the
Printer DHCP server would hand out an IP to my wifi card :-/.

That could explain it. The way to check is to turn off the router, turn on the printer and try bringing up wifi (if that's how you connect). Otherwise, forget it.

turboscrew · 09-01-2018, 04:58 AM

Aha. I'm obviously in the right place now... :-)

Thanks.

turboscrew · 09-01-2018, 05:24 AM

I just can't figure out what the MAC a0:28:ed:85:2f:73 is.
The other MAC is (according to the printer itself) the wired IPv4 connection, and wireless has yet another MAC (but wireless is OFF).
The printer also says that my router is the DHCP server.

Habitual · 09-01-2018, 11:52 AM

Quote:

Originally Posted by turboscrew

The printer is HP_Color_LaserJet_MFP_M277dw (in case it matters).

MultiFunction Printer.

turboscrew · 09-01-2018, 01:05 PM

Quote:

Originally Posted by Habitual

MultiFunction Printer.

???
That was not helpful, and neither was the troubleshooting manual.
I have the repair manual too, but that's even less helpful here.

turboscrew · 09-01-2018, 01:09 PM

The wireless MAC is d8:0f:99:07:e6:6f, so that's no explanation.

business_kid · 09-02-2018, 06:49 AM

Quote:

Originally Posted by business_kid

The way to check is to turn off the router, turn on the printer and try bringing up wifi (if that's how you connect). Otherwise, forget it.

How did this go?

turboscrew · 09-02-2018, 10:53 AM

Quote:

Originally Posted by business_kid

How did this go?

It didn't have an IP. It doesn't seem to have a DHCP server.
(I'm using wired connection.)

turboscrew · 09-07-2018, 02:23 PM

A-ha. Mystery solved.
My router plays games.
The two entries were:
192.168.0.100 a0:28:ed:85:2f:73 NPIB88B68 2018/08/26 13:20:59 - 2018/08/27 01:20:59
192.168.0.104 30:e1:71:b8:8b:68 NPIB88B68 2000/01/01 00:00:42 - 2000/01/01 12:00:42

The second one is the printer, and it's hostname really is "NPIB88B68".
The first entry is my cellphone for which the router also gave the same name as the printer has.

Took some unplugging/replugging of stuff and some router resets until I realized...