Router WAN IP problem

[felang]

I´m having a strange problem with my home network setup. I´ve been running a Linksys WRT150N flashed with DDWRT for at least five years. I´ve decide to switch it out with Linksys E2500 mainly for 5Ghz band support.

The router is connected to a simple cable modem (no built in wifi or extra lan ports).

My problem is that for some reason the new router doesn´t seem to take the modem´s WAN IP like the old one does, instead it has an IP that seems local/NAT to me (starts with 10).
The modem doesn´t have router or built in NAT capability from what I can tell, it acts as a simple bridge and it doesn´t even seem to have a config utility I can connect to.

I´ve messed around with different settings to no avail, I´ve never seen a firewall on the WAN side before.

Basically the old DDWRT router is assigned an external IP address just fine while the newer router ia assigned a totally different one that does not match up with my IP when I look it up for example at http://www.whatismyip.com/

This is messing up my DNS access. Everything seems fine from the LAN side.

IS there any setting I should be looking for, maybe some kind of security measure?

Thanks.

 

[Fardringle]

Disconnect all power and cables from the router and modem. Leave them unplugged for several minutes. Connect the coax cable to the cable modem, then plug in the cable modem's power cord. Wait for all of the connection lights to light up. Then connect the power cord to the router, and connect the ethernet cable between the modem and the router. Then go ahead and connect your devices and test your connection to the Internet. This process should allow the modem to register and provide an IP address to the new router.

 

[felang]

Disconnect all power and cables from the router and modem. Leave them unplugged for several minutes. Connect the coax cable to the cable modem, then plug in the cable modem's power cord. Wait for all of the connection lights to light up. Then connect the power cord to the router, and connect the ethernet cable between the modem and the router. Then go ahead and connect your devices and test your connection to the Internet. This process should allow the modem to register and provide an IP address to the new router.

Tried that, same thing. I see that there´s Tomato firmware available for the E2500 and it supports 5ghz operation. I guess I´ll try that as last resort and report back

 

[Zargon]

I doubt its dd-wrt that's the problem

the cable companies keep telling us you don't have to have new devices provisioned, but they lie

 

[felang]

I doubt its dd-wrt that's the problem

the cable companies keep telling us you don't have to have new devices provisioned, but they lie

In that case, MAC cloning should help right? I´m at the office right now so I can´t test.

 

[Viper GTS]

In my experience if you manually release the WAN IP on your old device the new one will get a valid IP right away. If you don't do that it can be an excruciatingly long wait for the provider to forget your old MAC and play nice with the new one.

MAC cloning is not the right answer here, although it would likely work it's just a hack workaround to an easily solved problem.

Viper GTS

 

[alkemyst]

In that case, MAC cloning should help right? I´m at the office right now so I can´t test.

In my experience if you manually release the WAN IP on your old device the new one will get a valid IP right away. If you don't do that it can be an excruciatingly long wait for the provider to forget your old MAC and play nice with the new one.

MAC cloning is not the right answer here, although it would likely work it's just a hack workaround to an easily solved problem.

Viper GTS

I agree with Viper and except at the end IF you ever wanted to use that other device at home again you want to let your ISP know that MAC (they will actually probably have to have you go through the effort to connect it and all that jazz).

That said, with my provider every new WAN facing MAC-ADDRESS I bring up gets a new IP.

The thing that sucks is that new IP gets locked down for the things I already had to call that ISP about to unlock for me.

 

[felang]

Ok so I hooked up the old router, rebooted modem and got the correct external WAN IP. I then manually released the wan IP from DDWRT config, made sure no IP was assigned and unplugged it. I then hooked up the new router and the modem did not auto assign a WAN IP, after power cycling the modem It then assigned a local IP and not a true external address, I have internet access and everything, and upnp works, but I can't access SABNZBD externally.

I was already quite frustrated so I cloned the old router's mac to the new one, power cycled everything again and now finally was assigned an external IP (whatismyip.com matches my wan address).

Should I just leave it this way or maybe release my ip and leave it overnight and try again tomorrow without mac cloning?