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I'm searching for a method to determine if a pc (whose IP address I know) is or not in LAN connection with mine. I've tried asking subnet mask of both and comparing each bit of IP addresses, but I'm asking if there's a better and more direct way to do that. Sorry for my bad english :S
1What could be more direct than looking if both IPs inside the same subnet? – Victor Sorokin – 2011-07-08T14:15:17.620
1Oh, you want to know if both computers (yours and the other) are in the same subnet, in direct connection, without going through a router? – woliveirajr – 2011-07-08T14:16:14.617
Maybe my networking basics are a bit rusty, but what would being in the same subnet or not have to do with having a LAN connection? Anyway if you want to check if they're in the same subnet then yes checking subnet masks is obviously the way to go. – Voo – 2011-07-08T14:18:32.000
Not all IPs in your LAN will have the same subnet mask, at least when we talk about large enterprises and complex routing infrastructure. I can think of only one solution: maintain a whitelist (e.g. a file) that contains the IP address ranges you're interested in. – None – 2011-07-08T14:24:50.817
I wonder if we might be missing the bigger picture here. Why is it that you want to know whether there's a direct LAN connection? Perhaps there's an alternative check/piece of information that will serve the same purpose. – Andrzej Doyle – 2011-07-08T14:39:56.280
Sorry if maybe my question can be misunderstood! I'm looking for a method to check if a pc is not in LAN because I've to read a lot of Gbytes from it. If it's not on LAN it can take long time to complete the reading operation, so I'm trying to add a choice for users to esclude pc not in LAN connection from reading operations – Wallkan – 2011-07-08T16:10:10.383