On Wednesday, August 31, 2011 7:48:09 AM UTC-4, ed24 wrote: > > Thaks for your reply. > Of course I googled. I know all of the info you put in your reply, but > I am still not understanding why there are two WAN IP addresses on the > phone itself. > It makes no sense to me that a phone uses DOD (Department of Defense) > IP address segment of 28.197.54.* for rmnet0 interface. >
Think for a minute about a PC on a home network connected to a cable modem/router. The PC has some address - 192.168.x.x or 10.x.x.x on the local LAN downstream from that cable modem, and only visible to other local machines. If you visit a get my ip type site with the PC, you'll be told an external IP address assigned by the cable company, which may change from time to time. The reason there are two different addresses is that your cable modem and/or router are doing Network Address Translation (NAT). As IPV4 space is exhausted, the cable company may even be doing an additional level of this on its own. Now on the mobile network, you have much the same situation, only you have NAT (and actually a whole lot more) occurring at the tower or more likely the backend network feeding it. This results in there being an address for the rmnet0 interface, which is private to the mobile company's network, and also a different external address which comes up when you visit external sites like an IP checker page. Why the private internal address appears to be one reserved to another organization and not one such as 192.168.x.x or 10.x.x.x is unclear, but unless you are trying to access a site in the "miss-appropriated" network it should not matter, since nothing will get out of the mobile carrier's network until it has been address translated. Likely your ip spoofing alert from your wifi router came about as a result of your android device not taking and using a local IP address assigned by the dhcp server on your wifi router, but instead picking its own. This suggests there's something wrong with the configuration of your device or of the dhcp server on your router. -- You received this message because you are subscribed to the Google Groups "Android Security Discussions" group. To view this discussion on the web visit https://groups.google.com/d/msg/android-security-discuss/-/GfxIXE2kXfsJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/android-security-discuss?hl=en.
