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[GVG]

I have noticed that my router will freeze anytime my cable modem is issued a reboot command by my ISP. It can also occur if the cable modem lost and regained its signal.

The status page of the Router still says I have an IP and it appears to be normal in every way except it wont pass any data through the WAN port. The only way to recover is to also reboot the router. This is fine if I am home, but if I am away it kills my phone system (VOIP) and my alarm system.

Why would my modem rebooting make the router stop passing data through the wan port?

[Demonized]

Does the modem give out a new LAN IP? Or is it static?

[GVG]

It is a DHCP assinged IP, but it never changes. As long as I always have the same MAC address I get the same IP for months or years at a time. The only way to get a new IP is to:  ask for one, change my MAC address, or leave the modem off for a couple of weeks and wait for the DHCP pool to give it away.

[Clancy]

It is a DHCP assinged IP, but it never changes. As long as I always have the same MAC address I get the same IP for months or years at a time. The only way to get a new IP is to:  ask for one, change my MAC address, or leave the modem off for a couple of weeks and wait for the DHCP pool to give it away.

OK, dumb question but I have to ask. Do you have your NIC's MAC address entered into the space provided in the WAN setup page? I'm pretty sure that you do, but, ya know, I'm from the camp that preaches "the only dumb question is the one not asked". Of course, as soon as everyone in the brainstorming meeting assures me of this, they collectively look at each other with a "what a stupid question" look on their face when I'm not looking. 

[GVG]

No i do not have it entered.

[Clancy]

No i do not have it entered.

Ok, go to that setup page and then read the help file. I think that what it says about the MAC address window might help you with your problem. I hope. 

[Demonized]

I guess you have your 655 setup as 'dynamic IP' in http://192.168.0.1/Basic/WAN.shtml ?

[GVG]

I am not sure how entering a different MAC would be any different than using the routers default MAC. The router is what the cable modem sees, not the NIC of my computers. Also I have 11 computers and other devices on my network, so which NIC would I choose anyway?

[GVG]

Yes I am in dynamic IP. My ISP does not use static IP. In fact I tried to enter the dynamic info from the status page as static info instead and it would not work. I got no data transfer across to the cable modem.

[Clancy]

I am not sure how entering a different MAC would be any different than using the routers default MAC. The router is what the cable modem sees, not the NIC of my computers. Also I have 11 computers and other devices on my network, so which NIC would I choose anyway?

Well, I was assuming that when you set up your service your ISP "trapped" the MAC address of the hard wired line that was used to make the initial connection. Especially if they provided your first NIC. Then they would already know what it is. My poorly made point was that perhaps your ISP goes looking for that MAC address each time they have to restart their connection. If you were going to add a MAC address, I would sit at the PC that made the initial connection and clone that computers (NIC's) address. Whether or not it makes one whit of difference....I couldn't say. You can put in any address you like but if they are looking for a specific address, then the choice is obvious. I guess I should have first asked you if this is their standard operating procedure.

[Demonized]

Yes I am in dynamic IP. My ISP does not use static IP. In fact I tried to enter the dynamic info from the status page as static info instead and it would not work. I got no data transfer across to the cable modem.

What kind of internet connection do you have? Cable, PPPoE, PPPoA? And is your modem bridge by any chance?

[GVG]

As it says in the topic header, its a cable modem.

[Demonized]

As it says in the topic header, its a cable modem.

Sorry... 

This means you cannot setup anything in the router.... Try checking or unchecking (depending on the current status) the option "Use Unicasting :   (compatibility for some DHCP Servers)" on the page: http://192.168.0.1/Basic/WAN.shtml

See if that helps.

[GVG]

It happened again yesterday. Has anyone else ever seen this happen to them?

Just to summize:

Cable modem reboots, DIR-655 still shows getting a valid external IP from modem, all status indicators show online, but internet is not reachable.  Reboot the router or do a release/renew IP on the router and everything goes back to normal.

If no one else sees this happening it must be something with my SB5120 modem.

[Lycan]

When this happens can you ping the following?

1) the routers IP
2) the routers gateway ip
3) 4.2.2.2
4) google.com

Let me know where that fails.