What a heck is "bogon"?

Question

Level 2

284 points

What a heck is "bogon"?

Out of the blue today in Finder's sidebar, in SHARED, just under the Time Capsule a new item popped up:

All...

Selecting "All..." in sidebar shows in Finder's right panel as follows:

- under Name - bogon

- under Kind - Neighborhood

Restarting Mac, restarting Time Capsule, disconnecting and reconnecting cable modem - nothing helps, I can't get rid of it and I have no idea what it is...

Have I been hacked?

iMac G5 20"/2GB RAM; MBP/2GB RAM, MB/2GB RAM, Mac OS X (10.5.4), iPod 3G, iPod Touch 16 GB

Posted on Jul 11, 2008 8:12 AM

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Answer 1

Andrew Miller Author

Level 2

284 points

Jul 11, 2008 8:19 AM in response to Andrew Miller

Just booted my MBP and wife's MB - same thing in both...

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Answer 2

LarryHN

Level 10

106,142 points

Jul 11, 2008 8:25 AM in response to Andrew Miller

THis may (or may not) help

http://en.wikipedia.org/wiki/Bogon_filtering

LN

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Answer 3

Andrew Miller Author

Level 2

284 points

Jul 11, 2008 9:12 AM in response to LarryHN

Thanks, but I've done already basic search and found no help from Wikipedia article nor from any references it provided.

Changed passwords on Time Capsule, restarted and still the same.

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Answer 4

D Meyer

Level 1

0 points

Jul 11, 2008 9:59 AM in response to Andrew Miller

Could it be someone else's machine connecting via WiFi? If you have a WiFi network, you might have some outsider connecting to you and appearing in your list of shared volumes. Try turning off Airport and connecting with an ethernet cable to see if "bogon" goes away.

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Answer 5

varjak paw

Level 10

182,668 points

Jul 11, 2008 11:00 AM in response to Andrew Miller

You may be just seeing someone else's system on your cable network. Many cable systems run a neighborhood as a single flat network, so anyone with file sharing or iTunes sharing turned on may turn up in the Shared section of other people's systems. If Time Capsule allows you to block TCP/IP ports for the connection to your cable modem, try blocking file sharing (port 548) and Bonjour (5297, 5298 and 5353) and see if the listing disappears. If it does, then you are indeed seeing another system on your local cable system.

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Answer 6

j.v.

Level 5

4,155 points

Jul 11, 2008 8:49 PM in response to varjak paw

...and maybe smb port 139, too

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Answer 7

Andrew Miller Author

Level 2

284 points

Jul 12, 2008 1:50 AM in response to j.v.

There is no option on Time Machine to manually block any ports - you can add outside apps and ports they can use though, but there is nothing added in my TC configuration.

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Answer 8

varjak paw

Level 10

182,668 points

Jul 12, 2008 5:33 AM in response to Andrew Miller

You may just need to live with seeing that system listed, then, since any change you would make on your system to filter out seeing such shared systems would also affect seeing you own other systems. It's harmless to have external systems appear as entities in the Shared section.

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