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Am I correct in assuming this only affects the stock firmware and not say dd-wrt which I have installed on my e3200?

Which by the way is a pretty solid router so far. Aside from dd-wrt not supporting its 5ghz radio. I tried a Tomato build for it that support 5ghz, but for some reason my router would just lock up every other day with that firmware no matter how it was installed.

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Yes.

I have one of those with DD-WRT as well. A vuln in a router will only affect DD-WRT as well if it's a hardware vuln that allows (for example) corrupting/modifying memory, which would also make the attack need to be highly targeted, or a critical 0day in the linux kernel/dropbear, etc.

I had similar problems with Tomato on an E4200 -- it would reboot itself every few hours (noticeable when the wifi would disappear for a minute or two!). My guess is there was some kind of lockup, but a watchdog had enabled to reboot it when the lockup occurred. This can be caused by overheating, in which case you can try turning down the Tx power setting on one or both of the radios.

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