Linksys router will not pull IP from Comcast modem

I have a Comcast dynamic IP account for my Internet access, it is attached to a Linksys WRT54G2 wireless router.  It has been working fine for 3 months and then all of a sudden we couldn't get on the internet any longer.  The PC's can get an internal IP from the Linksys, but the Linksys will not pull the public IP from the router.  Here are the facts so far:

-I can hook a laptop directly to the cable modem and it gets an IP and can get out
-Once in 5 tries, the router will get an address from the modem, but it is completely different than the one the laptop gets (it is still a valid, public address) and it cannot get outwith that address
- I have reset both multiple times

Has anyone seen this?

Thanks.
tmckinney01Asked:
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tmckinney01Connect With a Mentor Author Commented:
I tried shutting both down for 20 minutes, resatrting the router and letting it sit for 20 minuttes and thenrestarting the router.  It still did not work, so as a next step, I reset the router to by pushing the reset button on the back.  As soon as it came up everything worked fine.  Now I just have to redo all the settings and filters and I will be back to where I was before all of this.
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that1guy15Commented:
Try a new cable between your router and Modem.

Also have you tried to restart the modem?
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tmckinney01Author Commented:
Additional info:

-I did try a different, known good cable from cable modem; and, it does work with the laptop
-As stated in the original question, I have restarted both devices multiple times.
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that1guy15Commented:
Sorry i must have missed the restart comment.

"I did try a different, known good cable from cable modem; and, it does work with the laptop"

but it still dosent work between the router and modem?

how long did you leave the modem shutdown before turning it back on. I have seen modems need at least 45 sec before restart to reset the mac its looking for.
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tmckinney01Author Commented:
No, the new cable does not make a difference with the router.  I can't say for sure, but I would guess a couple of the times th emodem was off for over a minute.
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that1guy15Commented:
Try this:

Shutdown both modem and router for about 1.5 minutes. First power on the modem and let run for about 45 seconds. Then power on the router.

I have also seen in the past the order the devices come online will matter.
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that1guy15Commented:
Im glade you got your issue resolve do you mind posting what you did to resolve the issue for further reference?
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tmckinney01Author Commented:
Sure, but I don't know how to do that.
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that1guy15Commented:
?????

just explain the steps you did or what solved the issue.
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tmckinney01Author Commented:
Oh, sorry, I thought it had to be posted somewhere.

If you read the post again you will see that I did describe exactly what I did to solve it.
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that1guy15Commented:
Sorry i did not see your final post.
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