Airtel ADSL: Third Light (Internet) Not Coming But Second (DSL) is stable

ajgamer

[OP]
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Dec 28, 2014
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Hi.

Connection Type: ADSL
Modem: TP-Link W8970

Whenever I restart the modem. It does show second light properly. But third light (Internet) doesn't come up.

Second light is stable and third light also is stable when it comes online.

But I have to wait for hours for the third light to come up since it doesn't come in minutes but it's very random.

No I don't have any kind of disturbance in the phone line. Internet is also stable when it connects.

It is just it doesn't connect as it used to connect. It takes so many minutes if lucky or many hours (I have to leave it on) to connect it.

It wasn't before the upgrade happened at the Airtel System and exchange. Before that it was very fast like within 1 minute or so it used to connect.

Here are the system log:

Code:
1970-01-01 05:57:27 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:56:52 PPP Information ppp1 sent [PADI Host-Uniq(0x00001a5a)]
1970-01-01 05:56:32 PPP Error ppp1
1970-01-01 05:56:32 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:55:58 PPP Information ppp1 sent [PADI Host-Uniq(0x000019b9)]
1970-01-01 05:55:53 PPP Error ppp1
1970-01-01 05:55:23 PPP Information ppp1 sent [PADI Host-Uniq(0x000018cf)]
1970-01-01 05:55:04 PPP Error ppp1
1970-01-01 05:55:04 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:54:29 PPP Information ppp1 sent [PADI Host-Uniq(0x00001851)]
1970-01-01 05:54:10 PPP Error ppp1
1970-01-01 05:54:10 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:53:35 PPP Information ppp1 sent [PADI Host-Uniq(0x00001773)]
1970-01-01 05:53:16 PPP Error ppp1
1970-01-01 05:53:16 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:52:41 PPP Information ppp1 sent [PADI Host-Uniq(0x00001645)]
1970-01-01 05:52:22 PPP Error ppp1
1970-01-01 05:52:22 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:51:47 PPP Information ppp1 sent [PADI Host-Uniq(0x0000159f)]
1970-01-01 05:51:28 PPP Error ppp1
1970-01-01 05:51:28 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:50:53 PPP Information ppp1 sent [PADI Host-Uniq(0x00001469)]
1970-01-01 05:50:34 PPP Error ppp1
1970-01-01 05:50:34 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:49:59 PPP Information ppp1 sent [PADI Host-Uniq(0x000013a3)]
1970-01-01 05:49:40 PPP Error ppp1
1970-01-01 05:49:40 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:49:05 PPP Information ppp1 sent [PADI Host-Uniq(0x000012bd)]
1970-01-01 05:48:46 PPP Error ppp1
1970-01-01 05:48:46 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:48:11 PPP Information ppp1 sent [PADI Host-Uniq(0x0000117f)]
1970-01-01 05:47:51 PPP Error ppp1
1970-01-01 05:47:51 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:47:16 PPP Information ppp1 sent [PADI Host-Uniq(0x000010b1)]
1970-01-01 05:46:56 PPP Error ppp1
1970-01-01 05:46:56 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:46:22 PPP Information ppp1 sent [PADI Host-Uniq(0x00000fb3)]
1970-01-01 05:46:02 PPP Error ppp1
1970-01-01 05:46:02 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:45:28 PPP Information ppp1 sent [PADI Host-Uniq(0x00000f1d)]
1970-01-01 05:45:09 PPP Error ppp1
1970-01-01 05:45:09 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:44:34 PPP Information ppp1 sent [PADI Host-Uniq(0x00000e87)]
1970-01-01 05:44:15 PPP Error ppp1
1970-01-01 05:44:15 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:43:40 PPP Information ppp1 sent [PADI Host-Uniq(0x00000de9)]
1970-01-01 05:43:20 PPP Error ppp1
1970-01-01 05:43:20 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:42:45 PPP Information ppp1 sent [PADI Host-Uniq(0x00000d28)]
1970-01-01 05:41:19 PPP Error ppp1
1970-01-01 05:40:56 PPP Information ppp1 sent [PADI Host-Uniq(0x00000bf1)]
1970-01-01 05:40:37 PPP Error ppp1
1970-01-01 05:40:37 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:40:02 PPP Information ppp1 sent [PADI Host-Uniq(0x00000b5b)]
1970-01-01 05:39:43 PPP Error ppp1
1970-01-01 05:39:43 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:39:08 PPP Information ppp1 sent [PADI Host-Uniq(0x00000ac2)]
1970-01-01 05:39:04 SYSTEM Notice DSL link up
1970-01-01 05:37:42 PPP Error ppp1
1970-01-01 05:37:39 SYSTEM Notice DSL link down
1970-01-01 05:37:20 PPP Information ppp1 sent [PADI Host-Uniq(0x000009e3)]
1970-01-01 05:37:00 PPP Error ppp1
1970-01-01 05:37:00 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:36:26 PPP Information ppp1 sent [PADI Host-Uniq(0x0000097d)]
1970-01-01 05:36:07 PPP Error ppp1
1970-01-01 05:36:07 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:35:32 PPP Information ppp1 sent [PADI Host-Uniq(0x0000090f)]
1970-01-01 05:35:13 PPP Error ppp1
1970-01-01 05:35:13 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:34:38 PPP Information ppp1 sent [PADI Host-Uniq(0x000008a1)]
1970-01-01 05:34:19 PPP Error ppp1
1970-01-01 05:34:19 PPP Error ppp1 Timeout waiting for PADS packets
 1970-01-01 05:33:44 PPP Information ppp1 sent [PADI Host-Uniq(0x00000803)]
1970-01-01 05:33:25 PPP Error ppp1
1970-01-01 05:33:25 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:32:50 PPP Information ppp1 sent [PADI Host-Uniq(0x000006b5)]
1970-01-01 05:32:31 PPP Error ppp1
1970-01-01 05:32:31 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:31:56 PPP Information ppp1 sent [PADI Host-Uniq(0x0000059f)]
1970-01-01 05:31:36 PPP Error ppp1
1970-01-01 05:31:36 PPP Error ppp1 Timeout waiting for PADS packets
1970-01-01 05:31:01 PPP Information ppp1 sent [PADI Host-Uniq(0x000004e6)]
1970-01-01 05:30:57 SYSTEM Notice DSL link up
1970-01-01 05:30:23 DHCPD Notice Send ACK to 192.168.1.100
1970-01-01 05:30:23 DHCPD Notice Recv REQUEST from <MAC ADDRESS>
1970-01-01 05:30:23 DHCPD Notice Send OFFER with ip 192.168.1.100
1970-01-01 05:30:23 DHCPD Notice Recv DISCOVER from <MAC ADDRESS>

Can you please check and help?

@manojrk @Karan
 
Last edited:

Karan

I am a n00b
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Gurgaon
PAD packets are used to negotiate PPP sessions. It starts with a PADI (Initiation packet), server responds with a PADO (Offer), client sends a PADR (Request) and the server responds with a PADS (Start). Sessions are terminated from either end with a PADT (Terminate).

In your case I see "Timout waiting for PADS" errors, this is because you have an unstable link. The DSL is dropping as it says "SYSTEM Notice DSL link down", so PPP times out over a period then attempts to renegotiate. If the link to any portion of the network between the PPP client and PPP server is still down then the client sends it's PADI but never receives a PADS. This process keeps repeating until there is a stable link. The problem also is that airtel has a system in place that only allows one successful connection attempt every few minutes, this is to prevent too many PPP sessions from being logged by an unstable link, it will not send that PADS back that your modem is looking out for, the modem then tries repeatedly for the same, that is probably why your connection takes a long time to stabalise.

The issue could be the modem or at airtel's end. What VPI/VCI do you have in the modem and also what encapsulation is setup?
 
Last edited:

ajgamer

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Dec 28, 2014
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@Karan

Don't mind but I have days when I did router restart like many times within few minutes. (Within the bracket of 5-10 minutes). I never faced such issue that time.

This thing is changed after the upgradation only.

According to you, Airtel has it since long or they have added this lockout thing just few months back?

Check the screenshot:

 


Karan

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Gurgaon
The lockout thing has been around for quite a while, it only kicks in if your PPP session doesn't start cleanly, i.e the PADS part.Restarting your router doesn't cause that, so that shouldn't be an issue.

The modem config looks good for the VPI/VCI and Encapsulation. I would assume you had the exact same modem and config before airtel upgraded your area?
 

Karan

I am a n00b
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Gurgaon
I can only assume that something is wrong at airtel's end then.
 


ajgamer

[OP]
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Dec 28, 2014
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@Karan How can I get it fixed since you know their team is lack of knowledge and Airtel itself doesn't move their ass to fix issues or find out the problem.
 

Karan

I am a n00b
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Gurgaon
The first thing you could do, if possible, try another DSL modem, if you have another or maybe borrow one from someone to test and rule out yours causing issues. Sometimes the modem can also cause issues like this.

After that you would need to bug airtel to diagnose and resolve this issue.
 

Karan

I am a n00b
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Aug 23, 2006
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Gurgaon
Yes, they very much do. Not saying that it is the issue here, just trying to rule it out. Its the easiest diagnostics you can do without involving airtel. Since airtel changed stuff at their end, at times the new server end hardware may not go well with the modem and also cause issues. If two different modems exibhit the same symptoms then the issue would most definately be at airtel's end.
 
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