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Hardware Thread, Nightly cut-off of broadband in Technical; Hello, We experince a problem that is sadly not router-based, since I changed the router and it continues. Every morning, ...
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    Nightly cut-off of broadband

    Hello,

    We experince a problem that is sadly not router-based, since I changed the router and it continues.

    Every morning, the broadband line has dropped at some point during the night, and I have to unplug, then replug in the phone line into the router. It is a five second job, but a real hassle at the same time.

    Has anyone else experienced this/come up with a solution? We did try a timer, but the plug for the router is one that doesn't seem to fit any of the three timers we tested out!

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    Jona's Avatar
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    Well the low tech solution for your timer not fitting problem might be to get a short extention lead / multi-block which the timer would fit into....

    But I'd suggest you probably want to do a bit more investigation into whats causing the problem especially if it happens every night...

    Could you run some form of monitor / ping to determine exactly what time it goes off and if it's the same every night??

    Does the router freeze up completly or just drop the net connection and not reconnect (if so perhaphs there are some auto reconnect type options you could set?)

    Cheers
    Jona

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    mark's Avatar
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    What ISP?
    Do you have anything else on the phone line - sky etc?

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    We use Lixxus, and nothing else is on the line (it is a school). I will look at the router firmware and see if it produces reports I can find some error message from.

    mrlegs

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    Ric_'s Avatar
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    You may also want to check what traffic is going out at night... some routers have a tendancy to lock up if there is massive amounts of certain traffic (usually bittorrent or virus/worm).

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    This is the router log from the weekend. Does anyone notice anything untoward here:

    Fri, 2008-01-18 11:38:16 - ICMP Packet - Source:205.234.160.30 Destination:84.201.136.211 - [DOS]
    Fri, 2008-01-18 11:38:16 - ICMP Packet - Source:209.170.96.196 Destination:84.201.136.211 - [DOS]
    Fri, 2008-01-18 11:38:16 - ICMP Packet - Source:202.172.101.35 Destination:84.201.136.211 - [DOS]
    Fri, 2008-01-18 11:38:16 - ICMP Packet - Source:66.77.34.235 Destination:84.201.136.211 - [DOS]
    Fri, 2008-01-18 11:38:17 - ICMP Packet - Source:202.67.211.244 Destination:84.201.136.211 - [DOS]
    Fri, 2008-01-18 11:38:17 - ICMP Packet - Source:205.234.160.30 Destination:84.201.136.211 - [DOS]
    Fri, 2008-01-18 13:11:29 - UDP Packet - Source:212.58.227.87,24814 Destination:84.201.136.211,6970 - [DOS]
    Fri, 2008-01-18 18:03:24 - LCP down.
    Fri, 2008-01-18 18:03:30 - Initialize LCP.
    Fri, 2008-01-18 18:09:34 - LCP is allowed to come up.
    Fri, 2008-01-18 18:09:45 - CHAP authentication success
    Fri, 2008-01-18 18:23:42 - LCP down.
    Fri, 2008-01-18 18:23:50 - Initialize LCP.
    Fri, 2008-01-18 18:29:53 - LCP is allowed to come up.
    Fri, 2008-01-18 18:30:15 - CHAP authentication success
    Sun, 2008-01-20 03:51:56 - LCP down.
    Sun, 2008-01-20 03:51:58 - Initialize LCP.
    Sun, 2008-01-20 03:55:23 - LCP is allowed to come up.
    Sun, 2008-01-20 03:55:34 - CHAP authentication success
    Sun, 2008-01-20 04:18:45 - LCP down.
    Sun, 2008-01-20 04:18:52 - Initialize LCP.
    Sun, 2008-01-20 04:20:06 - LCP is allowed to come up.
    Sun, 2008-01-20 04:20:20 - CHAP authentication success
    Mon, 2008-01-21 08:24:39 - Administrator login successful - IP:172.16.1.1

    Thanks in advance,

    mrlegs

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    m25man's Avatar
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    If this is an ADSL connection I would be looking for your connection status information, notably the SNR figures.

    Your logs do not show anything out of the ordinary however the line was dropped, redialed and dropped again.

    This is characteristic of an ADSL line dropping out of sync.

    It tends to happen at night as temperatures drop and moisture enters connectors and joints in the wires between you and the exchange.

    Ideally you need an SNR greater than 20 db and a Loop Attenuation of less than 60db

    If your SNR drops below 10 then so will the line as the router can no longer distinguish between a Hi and Low signal.

    If your router still appears to be connected and you can manage it from inside your lan then your routing has failed.
    If this device has wireless enabled try to disable it, as many of the less expensive devices have real difficulty in routing correctly when they have 3 interfaces to manage.

    Some router manufacturers have special firmware versions for low signal areas (greater than 6km) these set the thresholds lower but these must not be used in high signal areas.
    Last edited by m25man; 21st January 2008 at 08:50 AM. Reason: Ommission corrected.

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    DMcCoy's Avatar
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    Quote Originally Posted by m25man View Post
    If this is an ADSL connection I would be looking for your connection status information, notably the SNR figures.

    Your logs do not show anything out of the ordinary however the line was dropped, redialed and dropped again.

    This is characteristic of an ADSL line dropping out of sync.

    It tends to happen at night as temperatures drop and moisture enters connectors and joints in the wires between you and the exchange.

    Ideally you need an SNR greater than 20 db and a Loop Attenuation of less than 60db

    If your SNR drops below 10 then so will the line as the router can no longer distinguish between a Hi and Low signal.

    If your router still appears to be connected and you can manage it from inside your lan then your routing has failed.
    If this device has wireless enabled try to disable it, as many of the less expensive devices have real difficulty in routing correctly when they have 3 interfaces to manage.

    Some router manufacturers have special firmware versions for low signal areas (greater than 6km) these set the thresholds lower but these must not be used in high signal areas.
    Snr can be much lower if its an adsl max (up to 8mb rather than a fixed speed). The lowest limit is 3, rising in 3 db increments to 15. When there are a certain number of disconnection events the exchange will increase the target snr that is negotiated with the router.

    One thing to check is that you don't have an alarm system or something else on the same line as sometimes they get wired in without a filter.

    The router should cope with these drop outs and re-sync the line a restart the ip session though.

    Also check that is not set to connect on demand with a timeout, rather than staying on all the time.

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    Thanks I will check both those things.

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    Oops_my_bad's Avatar
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    Is that a netgear? if so what model.. you would be better to upgrade the firmware because the later versions actually show if it was a line drop (sync loss) or just PPP. In your case you can't tell. You would then be able to narrow it down to either a line or ISP issue.

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    Edu-IT's Avatar
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    I talked to my ISP about the LCP down message in my router log and from what they told me it was to do with the equipment at the exchange not authenticating my username/password. Whether this is correct I do not know but Linksys said something similar.

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