Scanning not working b/c ICMP or SNMP is blocked?

Question

Level 1

6 points

Scanning not working b/c ICMP or SNMP is blocked?

I'm having a terrible time getting scanning over the network functioning on 10.6.1 with my Brother printer/scanner. (Printing works fine.)

Because scanning works over USB, I suspected something was being blocked by the Mac. I turned of the firewall and still no luck. So I ran TCPDUMP and it looks like ICMP and/or SNMP is being blocked. This is what I get when initiating a request to the scanner:

18:00:40.845716 IP macbook.suthoff.com.64048 > brother.suthoff.com.snmp: C=internal GetRequest(45) system.sysName.0 E:2435.2.3.9.1.1.7.0
18:00:40.848540 IP brother.suthoff.com > macbook.suthoff.com: ICMP brother.suthoff.com udp port snmp unreachable, length 36
18:00:42.846122 IP macbook.suthoff.com.57266 > brother.suthoff.com.snmp: C=internal GetRequest(45) system.sysName.0 E:2435.2.3.9.1.1.7.0
18:00:42.848749 IP brother.suthoff.com > macbook.suthoff.com: ICMP brother.suthoff.com udp port snmp unreachable, length 36

Anyone else experiencing this? Tips? Suggestions?

MacBook Pro 15.4-inch: 2.4GHz (MA896LL), Mac OS X (10.6.1)

Posted on Sep 30, 2009 7:04 PM

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Answer 1

Kappy

Level 10

362,007 points

Sep 30, 2009 8:01 PM in response to Brian S

If your Brother device is not specifically a network device (has an "n" in the model like MFC-000n) then you cannot scan over the network. Scanning only works if connected directly to a USB port on a computer.

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Answer 2

Brian S Author

Level 1

6 points

Oct 1, 2009 5:51 AM in response to Kappy

Sorry, should have included the Brother model number: DCP 8065DN, so the N is there. I was able to scan over the network perfectly prior to 10.6.x. And as you can see in the trace (I think!) my Macbook and Brother printer are TRYING to communicate over the network.

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Answer 3

Kappy

Level 10

362,007 points

Oct 1, 2009 11:10 AM in response to Brian S

Then I would contact Brother tech support. I would also check for any updated drivers for your model. I went through this with a non-network model that bugged me badly until I traded emails with Brother tech support. It can take some research to find out what Brother models will and will not play nice with OS X. Contact their tech support. It sometimes took a couple of days to get a reply, but they did reply. Check their support web site for drivers in case new ones have been posted. Most printer manufacturers are playing catchup with SL. If you do have the most current drivers, then try uninstalling what you have, delete the printer in Print & Fax. reinstall the software an re-add the printer as well as configuring the Brother software to use the appropriate network connection - USB or Ethernet as I recall. Since the Brother model I have isn't a network model I don't know how the network configuration goes. Sorry.

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Answer 4

Brian S Author

Level 1

6 points

Oct 1, 2009 12:25 PM in response to Kappy

Solved.

I re-flashed and rest my router and that fixed it. It must have been blocking at least some UDP packets on the internal network, which it's obviously not supposed to do.

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