DSL connection loss: is this loss of sync?
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Posted by Allen Weiner on October 19, 2007, 3:20 pm
Please log in for more thread options modem/router. My DSL connection usually runs well. However, about once a week or so I lose my Internet connection. I originally thought this was due to DSL loss-of-sync. (My telephone line isn't that great. When I used to use dial-up, I got lots of disconnections and retrains.) However, I'm now not sure. When I lose my connection, the DSL LED on my modem remains a solid green. I tried accessing the modem to view the diagnostic log and the modem could not be accessed. I would think that even if I lost sync, I should still be able to access the modem. Following is the result of ifconfig and ping following a connection loss. (When my connection is up, ping 192.168.1.1 works fine.) /var/log/messages does not shed any light on this problem. Is this a loss of sync, or some other failure? If it is a loss of sync, why can't I access the modem? I can restore my Internet connection by first power-cycling the modem and after waiting for several minutes, then rebooting. I've not been able restore my connection without a reboot (e.g. service network restart ). [root@localhost ~]# ifconfig eth0 Link encap:Ethernet HWaddr 00:07:E9:01:B2:09 inet addr:192.168.1.47 Bcast:255.255.255.255 Mask:255.255.255.0 inet6 addr: fe80::207:e9ff:fe01:b209/64 Scope:Link UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:184694 errors:0 dropped:0 overruns:0 frame:0 TX packets:135087 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:268419465 (255.9 MiB) TX bytes:7410331 (7.0 MiB) [root@localhost ~]# ping 192.168.1.1 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. From 192.168.1.47 icmp_seq=2 Destination Host Unreachable From 192.168.1.47 icmp_seq=3 Destination Host Unreachable From 192.168.1.47 icmp_seq=4 Destination Host Unreachable From 192.168.1.47 icmp_seq=6 Destination Host Unreachable From 192.168.1.47 icmp_seq=7 Destination Host Unreachable From 192.168.1.47 icmp_seq=8 Destination Host Unreachable | |||||||||||||
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Posted by Ken Abrams on October 19, 2007, 4:38 pm
Please log in for more thread options Why indeed. >. I've not been
restart ).
> able restore my connection without a reboot (e.g. service network >
Seems like you have pretty much answered your own question. I suspect a
reboot alone would fix it too. Might be triggered by a rash of line errors but the line is not what locks up. | |||||||||||||
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Posted by Allen Weiner on October 20, 2007, 8:29 pm
Please log in for more thread options Ken Abrams wrote:
>
>> Is this a loss of sync, or some other failure? If it is a loss of sync,
>> why can't I access the modem? >
> Why indeed. > >> . I've not been
>> able restore my connection without a reboot (e.g. service network > restart ).
> Seems like you have pretty much answered your own question. I suspect a > reboot alone would fix it too. Might be triggered by a rash of line errors > but the line is not what locks up. > > My hunch (with zero evidence to back it up) is that a reboot should not be necessary. It should be possible to restart networking without needing to reboot. The fact that a reboot is necessary is indicative of a problem in my NIC or modem/router (hardware, driver, or firmware problem). | |||||||||||||
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Posted by Fake Name on October 20, 2007, 1:49 pm
Please log in for more thread options >Is this a loss of sync, or some other failure? If it is a loss of sync,
>why can't I access the modem? What other telco equipment do you have? For example, do you have DirecTv, Tivo, a Home alarm, etc... anything at all that makes a scheduled call ? | |||||||||||||
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Posted by Allen Weiner on October 20, 2007, 8:26 pm
Please log in for more thread options Fake Name wrote:
>> Is this a loss of sync, or some other failure? If it is a loss of sync,
>> why can't I access the modem? >
> What other telco equipment do you have? For example, do you have > DirecTv, Tivo, a Home alarm, etc... anything at all that makes a > scheduled call ? I don't have any other telco equipment. | |||||||||||||
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> why can't I access the modem?