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Old 05-17-2013, 05:24 PM
 
11,715 posts, read 36,346,982 times
Reputation: 7514

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I got a call today about an Internet problem. It would work intermittently, but mostly not.

The LAN is very simple. The ISP supplies a box that is the default gateway and does NAT. That connects to a switch. There's a Windows Server that handles DHCP and DNS in addition to file and print duties. There's a few other switches scattered around in work areas because no one wants to pull more cable.

The owner had the ISP come out and they verified that their box was working properly and a laptop connected directly to it could get online.

I ran ipconfig /all on a workstation, it all looked good, and I could ping the default gateway. Then I pointed the browser to the gateway address and the logon dialog announced itself as a Linksys BEFSR41. What? Where did that old thing come from?

It turns out that Fedex installed a new PC in the shipping department and I guess they needed another Ethernet port so they installed this router. Of course it had the same LAN IP address as the default gateway and broke the whole network's Internet access. Brilliant! But hey, it only cost a small business about a day of downtime.
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Old 05-17-2013, 05:56 PM
 
Location: Tyler, TX
15,210 posts, read 18,497,278 times
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The company should have a well defined policy regarding network devices and any vendor that wants to attach to their net should have to adhere to it, just like an employee would.
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Old 05-17-2013, 06:00 PM
 
28,638 posts, read 40,617,860 times
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Typical FedEx crap. Been there, done that.
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Old 05-17-2013, 06:01 PM
 
11,715 posts, read 36,346,982 times
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Quote:
Originally Posted by swagger View Post

The company should have a well defined policy regarding network devices and any vendor that wants to attach to their net should have to adhere to it, just like an employee would.
Good idea but that doesn't really happen in companies with 5 people.
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Old 05-17-2013, 07:04 PM
 
Location: Tyler, TX
15,210 posts, read 18,497,278 times
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Quote:
Originally Posted by EscapeCalifornia View Post
Good idea but that doesn't really happen in companies with 5 people.
LOL. Generally true, but it should.

Our office has less people than that, and our policy is very well defined, although it's not on paper. No 3rd party devices. Period. If a device doesn't have a DHCP reservation, it doesn't get an IP, and if someone were to hack our wifi and set an address manually, their traffic wouldn't get routed.
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Old 05-17-2013, 07:28 PM
 
10,755 posts, read 18,013,891 times
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We had an individual (in a business of about 50 people) decide to plug a wireless router into his wall jack and plug his computer into that, and use the wifi for his personal laptop. The Windows server saw a second DHCP server on the network so it shut its own down. The powers that be weren't happy, but they had no policy in place despite this happening before.
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Old 05-18-2013, 10:12 PM
 
Location: 10110001010110100
6,385 posts, read 10,847,586 times
Reputation: 5589
I wonder if that FedEx tech was previously working for Geek Squad?

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