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As the ISP-provided modem was generating pretty weak WiFi signal I've disabled its WiFi function, bought an Apple AirPort Extreme and connected it's WAN port to the modem. Now everything works just perfectly, but the AirPort configuration utility keeps complaining (yes, I know how to turn it off, but I am curious) about double NAT and demands me to reconfigure the modem to bridge mode. Why should I? What problems can double NAT cause?

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Added latency? probably not even a couple ms. Your setup is no different than many vitual machine setups. –  hydroparadise Dec 18 '12 at 14:18

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up vote 4 down vote accepted

Anything that automagically open up holes in your firewall (for instance, as BitTorrent client might use uPNP to get a port opened for itself without direct user intervention) is going to fail, because it can't access the 'outer' NAT.

Otherwise, it's a bit of added latency (not likely to be significant) and you're paying to power two devices instead of one.

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I had tried double and triple NAT-ing setups for fun. For most intents and purposes, double NAT-ing doesn't affect simple browsing/mail experiences. (adds less than 1ms of latency)

However, if you want remotely access your home network (or services) from internet. It would be a lot more complicated to set that up. That's the only disadvantage I can think of.

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