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What do ATM OAM pings in modem diagnostics mean?Apologies if this has been answered, I searched but did not find an explanation. I lost internet connectivity in the middle of a surf session last night. This morning still no connection, so I connected to the modem (Broadmax), whose diagnostics tell me (in part, everthing else is OK except the stuff under the ppoe server which are all n/a because there's no connection) Test ATM OAM segment ping: Pass Test ATM OAM end to end ping: Fail Test ppoe Server Connection: Fail What do the two ping tests refer to? What is the significance of segment passing and end to end failing? I'm trying to get an idea of what's going on before I submit to the hell of EL phone support. (Yes, I have rebooted the %$@*% modem.) Thanks |
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Doctor OldsI Need A Remedy For What's Ailing Me. Premium Member join:2001-04-19 1970 442 W30 |
Re: What do ATM OAM pings in modem diagnostics meaIt would help to know what was connected before the Modem that you removed so you could connect directly to it.
ATM is the cloud that the PPPoE travels over. It's not the reason you have no connection or you would posted I have lost Sync, I would hope.
Regards,
Doctor Olds |
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Re: What do ATM OAM pings in modem diagnostics mean?Thanks for replying, Doc, but I don't quite understand your reply. Maybe this will clarify.
The modem lights show that I have sync (flashing green), but it seems that I can't establish a pppoe connection (no solid green).
My setup: Broadstream modem to Linksys wireless/wired router to two pc via cat 5. I run XP, but have the XP firewall off and use Zone Alarm. I shut down Zone Alarm when I'm troubleshooting to rule out firewall issues.
Because neither power cycling nor resetting the modem solve the problem,* I removed the router from the chain and connected directly to the modem for two reasons (1) to remove the router as a variable/problem source and (2) to be able to get into the modem's diagnostics page to see if it would give me a hint as to what was happening.
(For some reason I cannot connect to the modem's internal "pages" when I have it connected to the router (it was the same with my D-Link router), so to get into the modem I connect it directly to the PC and reboot the PC.) Then, because the router is out of the loop, I go into the modem setup page and enter my username and password (the modem is usually in bridge mode when used with the router), and then see if I can access the internet.
That's what I did this morning, but no access, so I ran the modem diagnostics.
The modem diagnostics page returned errors on two test items:
Test ATM OAM end to end ping: Fail
Test ppoe Server Connection: Fail (all the other items in the "test ppeo server connection" section were marked N/A, presumably because they depend on the existence of a connection to the PPOE server)
The test item "ATM OAM segment ping" passed, though.
If the problem is not in the modem, I'm trying to get an inkling of where it is (do I have a telco line problem, or is the problem in the DSLAM). Do the ATM OAM ping tests give me any information about that?
Thanks for your help. |
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Nolonemo 1 edit |
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Hall MVM join:2000-04-28 Germantown, OH |
to Nolonemo
Re: What do ATM OAM pings in modem diagnostics meaThe ATM it's referring to is a "network". It's between your home, the phone company's C.O. (central office) that you're connected to, and finally to your DSL provider's "POP" (Point Of Presence), including any hops in between. If you dig out a map of the Midwest, find Dayton OH on it. Now find Detroit MI. I'm in Dayton and my Covad POP is (was, no DSL anymore) in Detroit. Best case scenario (fewest hops) would be a hop at my CO and the next hop being in Detroit. Even better, the POP be at my CO. It ain't that way though. There can be any number of hops in between. If there's a problem in between, you're normally re-routed around it and never know there's a problem. In your case, there is and they can't re-route you. Chances are, you're not the only person affected. What does Earthlink's network status page say for the LA area ?
Not until you leave the POP do you see the hops in a traceroute, for example. |
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Doctor OldsI Need A Remedy For What's Ailing Me. Premium Member join:2001-04-19 1970 442 W30 1 edit |
to Nolonemo
said by Nolonemo:The modem lights show that I have sync (flashing green), but it seems that I can't establish a pppoe connection (no solid green). My setup: Broadstream modem Read this: » EarthLink DSL FAQ » What do the lights on the LED display mean on the UHP modem?If the BroadMax is not configured, it cannot make a PPPoE connection. Once configured, what is the color that is flashing. quote: Configured:
1. Sync/PPPoE - Flashing amber indicates that the modem is training (looking for an ADSL signal). Flashing green indicates that the modem has Synchronized with an ADSL signal and is attempting to establish a PPPoE connection. Solid Green indicates that the Modem has successfully created a PPPoE connection.
Regards, Doctor Olds |
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As I said, I configured the modem after the reset(entering username and password in modem setup). After that was done, the pppoe light is flashing green, i.e., sync but no pppoe connection.
BTW, what's the deal with not being able to connect to the modem pages via the router. Is that normal?
Thanks again. |
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Nolonemo |
Re: What do ATM OAM pings in modem diagnostics mean?Internet access is back, go figure. |
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Bill_MIBill In Michigan MVM join:2001-01-03 Royal Oak, MI TP-Link Archer C7 Linksys WRT54GS Linksys WRT54G v4
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Re: What do ATM OAM pings in modem diagnostics meaI suggest going into the modem and record your readings now, when it's working. Set it aside in a text file for future comparison. I make Murphy work FOR me in: "Prepare for it and it will not happen". Is your LinkSys set PPPoE and has your login info? And, do you have a UHP modem that you have NOT put into BRIDGE mode? If so, you're the second one that apparently has a UHP modem defaulting to UHP/NAT/Router mode but also acts as a bridge if the right packet comes along. If this is the case, yes it's normal you won't get to the modem page through any router outputting PPPoE packets. EDIT: Also, if this is the case, the modem isn't negotating the PPP session so it's PPP light should be OFF. Is this the case? |
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Doctor OldsI Need A Remedy For What's Ailing Me. Premium Member join:2001-04-19 1970 442 W30 |
to Nolonemo
said by Nolonemo:what's the deal with not being able to connect to the modem pages via the router. Is that normal? Yes, it is. The Public IP of the Router cannot route to any Private IPs on the WAN and that's why you no longer can access the Modem when the Router has a Public IP. Regards, Doctor Olds |
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to Bill_MI
Bill and Doc, thanks for your replies. said by Bill_MI:Is your LinkSys set PPPoE and has your login info? And, do you have a UHP modem that you have NOT put into BRIDGE mode? If so, you're the second one that apparently has a UHP modem defaulting to UHP/NAT/Router mode but also acts as a bridge if the right packet comes along. Yes, that seems to be the case. If this is the case, yes it's normal you won't get to the modem page through any router outputting PPPoE packets. If I put the modem into bridge mode will I then be able to access its diagnostic & log pages through the router? Conversely, if I don't have my login information in the router and the modem is set up with that information, will Ibe able to access the modem pages via the router? (As a further query, in the Belkin setup, my choices are pppoe, static ip and dynamic ip. If I'm setting up the modem for pppoe, which of these should I choose in the belkin?) I'd like to be able to check stats without the rigamarole of taking the router out of the chain. EDIT: Also, if this is the case, the modem isn't negotating the PPP session so it's PPP light should be OFF. Is this the case? Yes, the pppoe light on the modem shows sync but no pppoe session (flashing green). If I put the modem has been put in bridge mode, the pppoe light is solid amber. After a reset, it goes back to flashing green as the default. Either way the performance seems to be the same. Thanks again. |
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Bill_MIBill In Michigan MVM join:2001-01-03 Royal Oak, MI TP-Link Archer C7 Linksys WRT54GS Linksys WRT54G v4
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said by Nolonemo:If I put the modem into bridge mode will I then be able to access its diagnostic & log pages through the router? Conversely, if I don't have my login information in the router and the modem is set up with that information, will Ibe able to access the modem pages via the router? (As a further query, in the Belkin setup, my choices are pppoe, static ip and dynamic ip. If I'm setting up the modem for pppoe, which of these should I choose in the belkin?) I'd like to be able to check stats without the rigamarole of taking the router out of the chain. The modem seems to be acting as a bridge even though it's NOT in bridge mode so putting it in bridge mode should be no change. If you set the modem to do your login then set the Belkin to "dynamic IP" you should be able to see the status page. You'll be running TWO address translations but unless you're doing something fancy you may never know. |
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