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I'm currently running a Linksys WRT54G with the latest firmware. I was recently thinking about newer routers and I realized that aside from new features (usb drives, media, etc) and faster speeds (802.11g vs 802.11n) I simply wasn't sure if there was any reasonable justification for upgrading a router that is otherwise working perfectly fine.

So, is there any reason to upgrade from a WRT54G in terms of security precautions? I recently ran the UPnP vulnerability test on ShieldsUp! and my router passed the test.

Note: I found another question on Super User that was similar but it focused on bandwidth concerns. My concern here is purely for security.

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If you are worried about security (or your routers best interests generally), look at upgrading the firmware on your current router to dd-wrt - dd-wrt is a very robust (Linux based but with an easy to use frontend) solution which was originally designed specifically for this router, but has been ported to many others.

At the end of the day, unless you are running an expensive firewall and have in-depth knowledge about firewalls, any router which handles WPA2 for wireless (and with it enabled and a non-trivial password) is going to give you about as much security as you can hope for (or should need) from a router if your router is behind NAT (which most end user devices like this one are - you can be sure it is if your desktop IP address starts with one of 10.x, 192.168.x or 172.16-32.x and IPV6 enabled on the router.

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Thanks for that. My original thought was the same, that as long as the router supports WPA2 security and my devices are behind the router's firewall there's not much else going on in newer routers to make it safer. That said, I figured there might be something that I'm not thinking of, similar to how the UPnP vulnerability just came out (which I appear to be safe from, ironically). –  raffi Feb 10 '13 at 16:41

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