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[midas]

Whenever my ISP changes my IP address I can no longer connect inbound with one exception that I'll get to later. Now, this is not a DNS problem. I use Dynsite to monitor the IP changes and it successfully updates my DNS. So the IP address resolves properly. But the status screen on the D-Link showing the IP doesn't update when it's changed. And once it changes, nothing inbound works.

I can no longer connect to my email server. RDP no longer works. I can't hit my FTP server. I even enabled remote administration and I can't even hit the router. If it happens when I'm home I can do a release and renew on the DHCP settings and it will pick up the new IP and immediately start working again. When it happens and I'm at work I have to tell my wife to power cycle to fix it.

The one thing that continues to work even after an IP change is my Slingbox. For some reason that continues to work.

I'm currently running the latest firmware but this has been happening with the last 4 versions that I've tried. It wasn't too big a deal before when I was with Comcast and they only changed my IP every few months. But AT&T seems to be doing it a few times a week and sometimes multiple times per day.

[davevt31]

Are you using the Dynamic DNS page in the router setup?    Its under Tools > Dynamic DNS.

[midas]

Are you using the Dynamic DNS page in the router setup?    Its under Tools > Dynamic DNS.

No, that doesn't work since it never recognizes that it has a new IP.

[Sammydad1]

Hi,

Just curious how you have the DIR set for incoming WAN ?  I have mine set for Dynamic....so that it gets the IP from the cable modem (ISP)....  I presume if the cable IP changes, it doesn't affect the router's connection....

SD1

[midas]

Yes, it's set for Dynamic IP(DHCP).

PPPoe is handled by the DSL modem itself. I might try disabling that on the modem and use the router for that.

Outbound connections are fine. I can web surf, ftp files, basically anything that originates on my end. But when attempting to originate connections from the outside they don't work. As soon as I release and renew the IP address it works fine.

[Sammydad1]

Hi,

A lot of folks use their DSL modem in bridge mode and handle the PPPoE from with their router....just make sure you have the correct DSL (PPPoE) logon and password..... 8-)

How often is your DSL issuing new IP addys ?  That seems like it would be a pain at the wrong times....which prolly what led you in here....

Is there a setting in your DSL modem setups that controls how often it renews IP ?  I know for security purposes a varied external IP is better than static.... but still an ISP sholdn't renew that often....

SD1

[midas]

Hi,

A lot of folks use their DSL modem in bridge mode and handle the PPPoE from with their router....just make sure you have the correct DSL (PPPoE) logon and password..... 8-)

Remembering the password is the hard part. I'll probably wait till a day off during the week when I can call if I need to.

How often is your DSL issuing new IP addys ?  That seems like it would be a pain at the wrong times....which prolly what led you in here....

It's pretty random. Sometimes not for days, sometimes multiple times per day.

Is there a setting in your DSL modem setups that controls how often it renews IP ?  I know for security purposes a varied external IP is better than static.... but still an ISP sholdn't renew that often....

SD1

I don't remember ever seeing a setting for DHCP life. But really, that's all beside the point. The router shouldn't be blocking traffic when the IP changes. I was actually using the connection yesterday when it changed. All traffic stopped for the few seconds it took to get a new IP. The router should see that and update it's internal registers with the new IP. But it will continue to show that old IP on the status screen until I manually release and renew or reboot.

[Sammydad1]

I just never have seen of an ISP changing IP during traffic being sent....  That whole idea just strikes me as rather unusual....

Seems to me the right thing for an ISP to do is to sense idle times.... like 3 AM for most folks except me maybe...


SD1

[midas]

I've had it change many times when I'm using RDP at work to connect to my house. I'll lose the connection and it won't be able to connect again. There's obviously traffic flowing at that time as RDP is always swapping packets.

[midas]

Well I may have found a solution, only time will tell.

I had the modem set to pass the public IP address to the router. I did this when I was trying to use the built-in DDNS on the router. I changed it to send a private IP instead. Hopefully that won't change and since the router won't know the public IP changed, maybe it won't block inbound traffic.

As I said, only time will tell. But this definitely seems like a bug of some kind. I'll have to see if this change also affects any other functionality.

[midas]

Is there a setting in your DSL modem setups that controls how often it renews IP ?  I know for security purposes a varied external IP is better than static.... but still an ISP sholdn't renew that often....

BTW, the DHCP lease on the modem is set to 30 days. Obviously that doesn't work too well either.

[midas]

Just wanted to post a follow-up.

After changing my modem to pass a non-routable address my original issue is fixed. It still should work the other way, but at least I don't need to buy a new router right now. I still haven't tried the built in DDNS set like this. That's next.

[bigeyes0x0]

If you use the Dynamic DNS client inside the DIR, it can't detect the IP change because it's on the external side of your modem which is running in router mode I guess. If you have ADSL, set your modem to bridge mode and use the PPPoE client in your DIR (remember to set the correct MAC if your ISP require it). This should fix it.

[midas]

Yea, Dynsite uses an external site to check your IP, but the DIR appears to only use the IP it sees, so, no go on that. I'll have to try bridge mode when I have some more time to play with it.