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I am trying to deploy a Tahoe-LAFS grid on my machine, but other machines can't connect to mine. In the configuration doc it mentioned that a NAT device in action may need further configuration. So I am wondering that if my machine is connecting to a NAT device or not, how do I check it?

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migrated from Jul 12 '13 at 4:28

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if the other devices are on your local network, and you only have one network, you do not have a NAT device inside your local network. if the clients are outside your local network (across the internet somewhere) then you do likely have a nat device between you and them (your router). – Frank Thomas Jul 12 '13 at 5:14
up vote 2 down vote accepted

You don't specify what "other machines" means. NAT takes place at a gateway or router. If the other machines are on another network, connected by one or more routers than it's possible you're having NAT issues. If they're on the same network, then NAT is not a potential issue.

To start diagnosing your issue, your should try pinging one of the remote machines, and having it ping your machine. If it works in both directions then NAT and associated routing issues are not the culprit (it's likely a firewall issue at that point, possibly on your local machine).

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Here "other machines" means they are on another network, after migrating them to the network to which my machine connected. Problem solved. – Elderry Jul 12 '13 at 6:24

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