Help! My WAN IP is dynamic but never changes? [Linksys WRT54G]
So yeah, I got a Webstar modem and a Linksys WRT54G router.
When I connect the modem's wire to the PC instead of connecting it to the router and then from the router to the PC, my WAN IP always changes. On the contrary, when my PC is connected to the router, my IP NEVER change .
I tried doing DHCP Release / Renew and even left both the router and the modem powered off for a whole night and still, same IP!
Any suggestions?
Thanks in advance.
Sorry, but this gets more confusing.
So far I thought the IP address of the PC changes if you switch from the PC to the router and back to the PC.
Now you write they reserve it with the MAC address. In that case the PC should also always get the same IP address from your ISP. Unless you modify the MAC address of the PC of course.
So please explain: when does the IP address of which device change?
Based on your last post the IP of either device should never change unless you change the MAC address of the device, i.e. the router should always get the same IP address and the PC should always get the same IP address.
And what is the problem with the static IP addres anyway?
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From your tests, though, it does not seem to be the firewall. However, to be sure, it would be good to check the log. It will help to eliminate the firewall as the culprit and you may find it handy in the future, too. ;-) Just don't forget to turn the log off again after you are done because it may cause some performance penalty on your system while on.
From what you write, it seems as if I should give a little networking background on the ip addresses you'll see. Your setup is (or should be) a modem connected to the WAN/Internet port of the WRT. The computer is connected into a LAN port of the WRT.
Your router has two IP addresses (that's what makes it a router): a WAN address and a LAN address. The WAN address is the address assigned by the ISP. It is a normal internet IP address. Everyone is able to send packets to this IP address. The WAN address is the one reported by whatismyipaddress.com, it should be listed in the dyndns record and it is the address that your router shows on the Status page. It's the public IP address of your router. Dyndns maps your dyndns.org name to that IP address.
Your router also has an IP address on the LAN side. You can configure it to be whatever you want. The default is 192.168.1.1 with netmask 255.255.255.0 and it is better to leave it like that or at least inside the network 192.168.*.*. 192.168 is a special, reserved IP address range for private networks. Basically, routers in the internet are not supposed to forward addresses in this range. That makes them suitable for private LANs as the packets never can get anywhere. Most people using Linksys routers have there LAN in 192.168.1.*.
The router acts as gateway, which means it forwards packets from PCs in the LAN to the internet and back. As all your PCs in your LAN share a single WAN IP address, the gateway does address translation (NAT). This works only in one direction: from the inside to the outside. The router remembers when a PC in your LAN sends something out and accepts the responses in and sending them back to the PC. If something comes in from the internet which cannot be associated with a ongoing communication the packet is dropped unless you use port forwarding.
All computers in your LAN either have a static IP address assigned or use DHCP to get it automatically. The router has a DHCP server as well which gives out IP address from 192.168.1.100-149 if not changed. With a router with default settings static IP addresses can be in the range of 192.168.1.2-99 and 150-254.
ipconfig /all reports your IP address in your LAN, i.e. an address 192.168.1.*. The gateway in this output should be 192.168.1.1 which is your router. And packet no in the LAN address range 192.168.1.* is send to the router which forwards the packets into the internet.
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O.K. so much for networking. I hope that makes things a little clearer and you can verify that your setup is how it is intended to be.
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