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Hi folks, I have a dd-wrt mini router (Linksys WRT54GS v7) which I am worried may be compromised. It is sending out a packet every 5 seconds somewhere despite the fact that my WiFi is disabled (everything is hard-wired here) and all machines are either off or unplugged.

The simple topology would be:

Router --> Modem --> DSLam --> net provider [The modem is an old SpeedStream DSL modem.]

I know that it is not an internal network issue (i.e. not inside the LAN) since all computers are unplugged or off when packets are still being sent out.

I called my net provider but the network admin did not want to take the time to diagnose the issue even though I think this would be the quickest way to diagnose what is going on.

So my question is what would be the best way to diagnose this problem? How would I go about diagnosing it myself? I would like to know what type of packets the router is sending out.

asked 20 Sep '13, 15:00

Bongoman's gravatar image

accept rate: 0%

how do you know the router sends packets every 5 seconds?

(20 Sep '13, 15:46) Kurt Knochner ♦

How would I go about diagnosing it myself?

Log into the router via ssh and run tcpdump on dd-wrt

tcpdump -ni eth0 not port 22

Maybe eth0 is not the right interface. Please check with ifconfig.


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answered 20 Sep '13, 15:49

Kurt%20Knochner's gravatar image

Kurt Knochner ♦
accept rate: 15%

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question asked: 20 Sep '13, 15:00

question was seen: 1,841 times

last updated: 20 Sep '13, 15:49

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