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Re: [Fed-Talk] iPhone ip address?
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Re: [Fed-Talk] iPhone ip address?

  • Subject: Re: [Fed-Talk] iPhone ip address?
  • From: Brian Reese <email@hidden>
  • Date: Fri, 06 Jan 2012 21:07:28 +0000 (GMT)
Since no one else replied, I'll take a stab at it.

It sounds like that "local IP address" might be the IP address given to your 3G radio by your provider (AT&T, Verizon, etc). This interface probably remains active and is just demoted to secondary status once you have an IP via WiFi. This would explain why you had the same IP once you turned WiFi off. It would also explain why you got a similar but different IP when you rebooted, since the phone would have to renegotiate a connection with the carrier. If this is the case, the name "local IP address" that program uses is somewhat misleading.

Hope that helps.

On Jan 05, 2012, at 03:41 AM, "Andreoli, Tony A USNUNK NAVAIR B1490, R215" <email@hidden> wrote:

As part of an iOS pilot program I was messing around with the F5 edge client yesterday. Trying to troubleshoot a VPN issue, I downloaded "Free IP Address". This app shows me both my "Global IP Address" (i.e., my NAT'd IP, which shows up when I go to www.findmyip.com) as well as my "Local IP Address", which I'm assuming to be the IP I get on my local network (i.e. behind my home router).

The Global IP address is correct, and checks against www.findmyip.com, and the Local IP comes to 10.242.122.23, which I thought was a little odd, since I'm doing internet sharing through a desktop Mac, so expected 10.0.x.x. I turned WiFi off, going only through 3G, and retained the same Local IP (though the Global did change, and I confirmed working network connectivity).

Thinking this odd, I turned the phone off and back on. This time, I got 10.242.186.89 as my Local IP. The same /16 subnet, but this time I'm not attached to the Mac. So for fun, I went home, where my house network is 192.168.0.x. Again, the Global address is correct, but I'm still showing a 10.242.x.x address for the Local IP. If I go into Settings -> WiFi and look at my connection, it shows a 192.168.0.x address assigned by my dhcp server, so now I'm really confused! Incidentally, I downloaded another IP address checker program, which gives me the same results as the first, so I don't believe the local IP is in error.

I guess my question is... What's going on here? What is this 10.x.x.x address, and where's it coming from, because I think, in the end, that's what's screwing with my VPN connection (the remote end is 10.0.0.0/8 so I think the routing's hosed).

Any insight into this would be appreciated.

Thanks,
Tony Andreoli
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 >[Fed-Talk] iPhone ip address? (From: "Andreoli, Tony A USNUNK NAVAIR B1490, R215" <email@hidden>)

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