Linksys Cable Modem and Router not exchanging WAN IP info correctly?


OSNN One Post Wonder

Long-standing problem that is driving me nuts.

We have a wired and wireless net connected via switches to a Linksys Etherfast Cable/DSL Firewall Router and a Linksys Cable Modem (v3). Current firmware on everything.

Have replaced both the router and the cable modem trying to fix this. No go.

What is happening is that we are just spontaneously losing internet connectivity. Generally we are ok inside the local net.

You can look at the cable modem status page when the internet has been dropped and it shows everything as operational and locked. Downstream strength is generally 45 to 50 dBmV and upstream -6 to -8 dBmV.

Can generally restore things by resetting the router (recycling) or accessing it and telling it to reset IP.

Problem *may be* cable service changing WAN IP address on us and the router is just not picking this up, continuing to try to address an old WAN IP as gateway.

Anyone got a fix for this, or other ideas?

Many thanks,


Carbon based lifeform
Political User
Try Calling the Charter tech support, If you replaced the modem did you give them the new MAC,type ipconfig at the command line or it can be found on the underside of the Modem, also if you can access the router settings disable the WEP (this tripped my Wireless on and off, until I disabled it) run WAP, In the wireless settings set the group key renewal to the max 99999. If you go through tech support they will walk you through Ipconfig /release and the Ipconfig /renew. Hope this helps

The router should be sending out the WAN signal. along with the network address, charter does not change the address of the modem. this is coming from the hardware. in the wireless network you should be getting an address from the router.

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