ADSL router syncs OK, but no DHCP address...

Very occasionally, when I've tried to go online, the modem syncs OK, green light, 7Mb downstream speed connected etc., however the BT DHCP servers seem not to respond to provide my modem with an IP address/DNS server info, so obviously I can't connect to anything.

Tried powering off and on, no luck, but if I leave it a for a while, and try again later, it's back again, and everything is OK. I have a Netgear DG824M router.

This evening it happened and I made the mistake of phoning BT support, who took me through every configuration setting on my PC and router (even though I assured them it was working perfectly yesterday and nothing had been changed). I eventually ended the call saying that I'd just leave it as it usually comes back on its own. He wouldn't agree that it was any problem with the BT side of things, but he said he'd call back tomorrow to see how I got on.

A few minutes later of course and it 'fixed itself' and we're back online. Has anyone else ever experienced this? Fortunately it doesn't happen very often...

You just need to connect, it is not issuing the address as you are syncing up but not connecting to the network. I am afraid that I have never used the router you have and neither will BT's technicians so you are on your own my friend. That is unless your router is not at fault.

Look at it's logs and post here.

Probably nothing wrong with your router. I used a DG824 for three years. What may be happening is that you are losing sync which is then recovering but not connecting to your ISP (BT) quicklyy enough for you.

Try this next time: Go to 192.168.0.1, choose Router Status, WAN Statistics (I think) which will bring up a pop up. Click on Connect.

Yeah - it doesn't get the WAN PPPoA connection.

I tried that 'connect'. I can sit and watch the WAN status refreshing itself, cycling between connecting/waiting for server. (This is not the 'sync' connect - it is definitely synced properly - status is 'CONNECTED', it is simply the WAN IP address/PPPoA connection which doesn't complete.) I sat and watched it in that state for about 15 minutes.

I don't think it's the router. It doesn't happen often, (it has happened about three times that I've noticed in the last six months and it always corrects itself - no user intervention can fix it - powering off etc., it simply doesn't get served the DHCP information for whatever reason.

Yesterday, it just magically got the address again, on it's own after about half an hour. After that it was fine - powered off/on to double check and it immediately got an address as usual and worked without a hitch.

Colin.

Edited by Seajay (Thu 22-Feb-07 13:15:43)

Hi,
Was asked by friend last night to look at their adsl connection and it showed exactly the same problem as you have outlined:
-line sync appears to be fine (syncs a 1M).
-no dhcp adress is obtained by the router on its wan interface

The only difference is that is is not correcting itself (apparently it has been like that for the past 3-4 days). By the way they use the router supplied by BT (Voyager 210? from memory).

Has anybody come across this problem?
Any suggestions before I go back there and phone BT? (have checked filters, and tested with nothing else connected to phone line, rebooted everything several times)
Thanks

Seems you are not authenticating with the RADIUS servers. Call up BT.