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Can I troubleshoot fiber converter with wireshark "unexposed"?

asked 2018-01-18 18:12:22 +0000

Hi! My ISP is causing me some trouble which I hope wireshark might help at least to diagnose..

Background Setup: Fiber connection - fiber converter - wiring - router - devices of all kinds Three different routers randomly restarts or freezes (D-Link DIR-655, Asus RT N56U both become unresponsive, D-Link DIR-882 restarts at least some internal interface) 5-20 times per day. An ethernet cable "tester" shows that the wiring to the router should be fine, and the problem is persistent even with the router connected directly to the fiber converter via a short brand new ethernet cable.

Now my ISPs second line support wants me to connect a computer directly to the fiber converter to omit the router as the problem. I take a bit of an issue with not having the router as an extra point of security I don't really like that suggestion, never mind the fact that they actually seem to think that I should personally monitor the connectivity of the computer, while checking if "the lights go out" on the fiber converter to see if this random problem (could occur with 5 minute intervals or 12 h...) occurs even with that setup.

Question: Would it make sense to connect a computer running wireshark to the fiber converter (has a built in switch), without accepting an IP adress assignment to monitor the status of the fiber converter/connection itself? (I guess listening to the chatter basically to see if it dies out..)

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On another note: how is your mains supply? I find it hard to believe your ISPs traffic can cause the same trouble with all these different routers.

Jaap gravatar imageJaap ( 2018-01-19 06:23:41 +0000 )edit

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answered 2018-01-18 20:10:06 +0000

sindy gravatar image

Would it make sense

Not much because unless the ISP connects several clients to the same L2 segment, which is rarely the case, you'll see no "chatter" at all until something at your end requests an address using DHCP or PPPoE or what your ISP's client connection method is. So I'd rather think of monitoring the connection between the convertor/switch and one of your routers using the computer and one of the capture setups, and letting a movie camera watch the indicator lights. Up to the time of the event you could then watch just a few minutes of the video to see whether the lights have shown some unusual behaviour.

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Asked: 2018-01-18 18:12:22 +0000

Seen: 191 times

Last updated: Jan 18 '18