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I support a small business' tech issues. Their guest Wi-Fi is important since they want people sitting around and consuming their product. We’re currently using a consumer-grade access point with DD-WRT.

Over the past months they've received many DMCA notices from their ISP for the downloading porn via P2P. We suspect a customer.

Is there a good way to stop (or significantly reduce) p2p on the guest wifi using dd-wrt? (focus narrowed in response to removal of previous question.)

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    Use a captive portal; block the typical ports used; even better only allow http and https
    – Ramhound
    Oct 16, 2015 at 19:22
  • You will need to use a mandatory proxy or DPI filter. Blocking ports to only allow HTTP/S won't work.
    – qasdfdsaq
    Oct 16, 2015 at 19:34
  • @qasdfdsaq DPI filter?
    – uSlackr
    Oct 16, 2015 at 19:37
  • @uSlackr: Deep packet inspection—you'd probably need some kind of UTM appliance, perhaps a FortiWiFi gateway would help here? They aren't cheap, though, and you'll need an expensive subscription to keep them running.
    – bwDraco
    Oct 16, 2015 at 19:58
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    The problem (which everybody seems to have missed) is BitTorrent trackers ARE HTTP, and practically always operate on port 80.
    – qasdfdsaq
    Oct 17, 2015 at 23:50

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If the business only wants users trying their product on the guest WiFi, you could set up a basic captive portal that forwards users to their product's website/servers, and block all other traffic using the router's built-in filters if it has them.

There are several appliances you could purchase that would be more granular if they don't want to totally restrict the access. One I can think of is Untangle.

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  • The goal is to allow them to use the wifi for everything - almost. This is a tap room. We want folks to hang out.
    – uSlackr
    Oct 16, 2015 at 22:01
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    @uSlackr I use untangle for my public WiFi APs in the convenience stores I work for. It's not free, but it's priced per app you use. Cheap if you only want the content control. You can install it on practically anything or buy one of their prebuilt appliances. untangle.com/ic-control
    – user201262
    Oct 17, 2015 at 1:48

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