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I would like to know if there is a way for me to change a router's default settings. When I say that I don't mean logging in the page setup and configuring it. What I mean is to change the settings that the router will be after you reset it (Even if it means brute-forcing my way there).

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I think the question is, "How do I lock my router so the settings cannot be changed". –  Xavierjazz May 9 '12 at 15:57
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Any concrete router you're looking at or just a hypothetical question? –  slhck May 9 '12 at 15:58
    
+I think the question is, "How do I lock my router so the settings cannot be changed" -Not really. It can still be changed. I just want it to have different settings when I reset it, since physical access to it is complicated. +Any concrete router you're looking at or just a hypothetical question? -I'm currently trying to do this on a WRT160Nv2 (It doesn't support DD-WRT, unfortunately...) –  OverAchiever May 9 '12 at 16:08
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The factory settings are stored in the firmware. So you have to flash the router with a custom firmware.

But first, you have to find where those settings are into the firmware.
Note some routers have a "security" against modified firmwares.

In short: you can't, except if you have lots of free time

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