S_Owen
Senior Heliman
Location: Wichita Falls, TX.
| That only works if the DHCP server is local. For WAN (DSL, cable, Bridge, etc) the IP address used is a separate scheme from what is being used locally. For example, your computer may have network address of 192.168.0.111, and gateway of 192.168.0.1. The gateway will have a WAN address of something like 64.155.28.201. The two schemes, 192.168.0.XXX and 64.155.28.XXX cannot communicate directly. That's the purpose of a router, a bridge, a modem, etc. They bridge communication between the different schemes. That's the way a computer with a local address of 192.168.0.1 can communicate with runryder's server at 205.134.230.242. If they were on the same local network, they couldn't communicate with each-other at all unless a router, or a server, joined the two.
When you renew your address, you are doing that locally. Meaning that the local DHCP server (witch may be part of your BB modem, bridge or router) will assign a new local address to your computer. So your address of 192.168.0.111 may change to 192.168.0.55, but only if a lease duration is not set. It can be changed to any IP as long as it stays in range and is not in the exclusion list. For the WAN, or the IP the rest of the world see's, it can only be changed between the ISP and the modem, bridge, or router. The gateway must remain static but that's local and doesn't really matter. So, even though you can change your local IP, your internet IP is not up to you regardless of protocol. This is something much easier to understand if you have ever set up a bridge. See, the ISP has to have more than 255 unique addresses, so there really is no way to connect to their network on a local address. So, they have to assign one for your use, on one of several schemes. If they didn't do it that way, you would never see anything outside of their network, meaning no www.
So even if you renew, your local IP will change, but even with that, it has to be set to a 0 day lease or the same IP will be re-assigned. But, again, that's local. Even if you change your local address, your WAN address stays the same.
There is no way to mask an IP. You can stealth them, meaning they will not respond to pings or TCP/UDP scans, but stealthing is impossible. Somewhere down the line, the IP must be known, otherwise you couldn't see this page. Nat forwards ports, it has nothing to do with addressed packets. You can address all the packets you want to, it only matters what port they are on. For example, you are seeing port 80, if you forwarded port 80, you wouldn't being seeing this except for on the computer you forwarded the port to.
Before "renew" look at the time "lease expires" and IP address.
After "renew" look at the same.
Router's WAN and local address info. It never changed. The WAN address is my internet IP address. It's the address you would see attached to an e-mail from me and the one assigned to me by the ISP, the one I can't change.
FWIW, information assurance, and security, is what I do.
[b]Murphy's Constant:[/b] Matter will be damaged in direct proportion to its value. |
