I am having the exact same probelem...I spent 2hrs on the phone my service provider last night. I though initially it was a dead router, so bought a new one another WRP400, and the same issue is existing on this one also.
The router just will NOT obtain a DHCP address from the Cable Modem. Yet when i connect the service providers modem directly into my laptop it gets an IP straight away and works fine.
Could you please advise ASAP.
Cable modem is a Motorola Surfboard Cable modem, connecting to my WRP400 router.
Please help, as i am at a complete loss, and now have two WRP400 routers, neither working.....one router is running the new firmware, one is running the old....the FW is making no difference.
I am in Canada and we are dealing with Cable Internet + VoIP with WRP400.
We are a Cable & DSL reseller and this issue we have it too but only on Cable with Static IP.
The problem is we get a DHCP lease every 24hours. If a person is on the phone while the lease is due the phone call will be cut and needed to be redialed.
A level 2 technician uses a Routerboard 750 and here's what he done on his own home setup:
"At home I'm with Videotron and I have a Routerboard 750. It's a router that needs to be configured manually before anything works.
I had the same issue we are now having with the WRP about a loss of connection every day for a month and a half before I fixed it.
In my configuration for my DHCP client, I had an option "Add Default Route" which if checked, will create an Internet route linked to my current IP address. It seemed like the logical thing to do.
What I didn't know is that that default route sends it's own DHCP request when it needs to renew itself and Videotron answers it with a NAK(Negative Acknowledgement) because I'm already registered.
That NAK was effectively killing my connection for 2 seconds every day.
I had to remove that option and create a manual route, linking my route to any IP (0.0.0.0) but to the WAN port my Videotron modem was connected to. Just doing that solved my issue completely.
There's a good chance it's the same issue we have with our WRP as they have exactly the same symptoms and we had one client (and only one) with a DHCP lease of one hour that will lose the phone line if she's on the phone when it happens.
We can't be fully sure until either Videotron can confirm the NAK or until the routes are changed on the WRP400.
The reason why I think only Cisco can help is that the WRP400 is a lot less configurable then the Routerboard 750 and won't let me save a static route with no IPs on the WAN port.
There might be a way to do it actually on our firmwares but I doubt it. Cisco should know, and if it's not possible they should be able to modify the firmware for it. It's not hard to do and most of their routers do it."
If anyone can find this information and send it to Cisco we might be able to fix our DHCP lease issue.
Article ID:1966 Network Address Translation (NAT) Settings for Lines on
PAP2T and SPA3102 Phone Adapters Objective The objective of this
document is to configure Network Address Translation (NAT) settings for
the lines of communication on the PAP2T and SP...
Article ID:2742 Speed Dial Settings on SPA100 Series Objective Speed
Dial Buttons are often used to make the process of calling regularly
used contacts quicker and with one button. This option is used in place
of dialing the entire phone number in. This h...
Article ID:2676 Firmware Upgrade on SPA112 and SPA122 Objective To
upgrade the firmware a specific file must be downloaded from the
Internet and uploaded to the device. Upgrading your devices can be very
useful. Firmware upgrades can fix software bugs, im...