why would DHCP fail?
RickMerrill
This AM - no connection. A poke in the eye with
a sharp stick (a.k.a. reset) fixes it, the log says DHCP
failed:
date time explanation
10/02/2009 01.17 TFTP failed - request sent - No Response
10/02/2009 01.17 DHCP WARNING - Non-critical field invalid in response.
10/02/2009 01.17 DHCP FAILED - Discover sent, no offer received
10/02/2009 01.15 No Ranging Response received - T3 time-out
10/02/2009 01.15 SYNC Timing Synchronization failure - Failed to
acquire QAM/QPSK symbol timing
10/02/2009 01.15 SYNC Timing Synchronization failure - Failed to
acquire FEC framing
10/02/2009 01.10 Received Response to Broadcast Maintenance Request,
But no Unicast Maintenance opportunities received - T4 timeout
10/02/2009 01.10 SYNC Timing Synchronization failure - Failed to
receive MAC SYNC frame within time-out period
Are leases from comcast set to timeout at 1:00 AM?
Is network maintenance being done at the same time?
Robt. Brogan
RickMerrill <Rick0....@gmail.lessspam.com> wrote:
Often my connection goes stupid and the error message is "can't find DHCP daemon" and comcast says
it's my sytemt(including their modem), IOW, NEVER their problem, always yours.
--
Bob
- Bobb -
I power off/on my modem every few weeks during off-peak times so if any
network 'enhancements' the network can re-establish clean connection. I
still occasionally get no response though no fault of mine. DHCP shows a
169. address
If you want to troubleshoot :
Rebooted modem? and/or Pc and OK now ?
Do you normally leave pc ON, or reboot/standby ?
Maybe just now got to you so dropped DHCP while offline ?
Are they maybe working on servers/network so ran out of IP addresses ?
How long is your lease good for ?
I've had from 1 hr to 2 days.
If you DO drop the connection and let PC sit, eventually the time period for
the network check/ handshake grows. At first it be might be seconds, grows
then .. a few minutes ... so when you try to get back online it's in 'quiet
mode'. What I do it break network connection at PC, then power cycle the
cable modem/router, enable network again.
http://technet.microsoft.com/en-us/library/cc958919.aspx
If the lease expires and no server has been contacted, the client must
immediately discontinue using its leased IP address. The client then
proceeds to follow the same process used during its initial startup to
obtain a new IP address lease.
Text message explanations:
http://www.dslreports.com/forum/r19913728-TWC-Have-a-question-on-Modem-Logs
>> Are leases from Comcast set to timeout at 1:00 AM?
>> Is network maintenance being done at the same time?
Right now mine is 48 hours from issue.
"Robt. Brogan" <rbr...@think.biz> wrote in message
news:rbrogan-57CAE4...@nntp.teranews.com...
> In article <ha51f3$td6$1...@news.eternal-september.org>,
> RickMerrill <Rick0....@gmail.lessspam.com> wrote:
>
>> Modem has been connected for 40 days w/o a problem.
>>
>> This AM - no connection. A poke in the eye with
>> a sharp stick (a.k.a. reset) fixes it, the log says DHCP
>> failed:
>> date time explanation
>> 10/02/2009 01.17 TFTP failed - request sent - No Response
>> 10/02/2009 01.17 DHCP WARNING - Non-critical field invalid in response.
>> 10/02/2009 01.17 DHCP FAILED - Discover sent, no offer received
>> 10/02/2009 01.15 No Ranging Response received - T3 time-out
>> 10/02/2009 01.15 SYNC Timing Synchronization failure - Failed to
>> acquire QAM/QPSK symbol timing
>> 10/02/2009 01.15 SYNC Timing Synchronization failure - Failed to
>> acquire FEC framing
>> 10/02/2009 01.10 Received Response to Broadcast Maintenance Request,
>> But no Unicast Maintenance opportunities received - T4 timeout
>> 10/02/2009 01.10 SYNC Timing Synchronization failure - Failed to
>> receive MAC SYNC frame within time-out period
>>
>> Are leases from comcast set to timeout at 1:00 AM?
>> Is network maintenance being done at the same time?
>
Right now mine is 48 hours.
RickMerrill
> Quick answer:
> I power off/on my modem every few weeks during off-peak times so if any
> network 'enhancements' the network can re-establish clean connection. I
> still occasionally get no response though no fault of mine. DHCP shows a
> 169. address
>
> If you want to troubleshoot :
> Rebooted modem? and/or Pc and OK now ?
> Do you normally leave pc ON, or reboot/standby ?
pc TO Sleep; modem and router on always (UPS)
> Maybe just now got to you so dropped DHCP while offline ?
I'm not sure what that means.
> Are they maybe working on servers/network so ran out of IP addresses ?
Unlikely in rural area like ours.
> How long is your lease good for ?
> I've had from 1 hr to 2 days.
That sounds about right. So in 40 days it must have renewed ok.
> If you DO drop the connection and let PC sit, eventually the time period for
> the network check/ handshake grows. At first it be might be seconds, grows
> then .. a few minutes ... so when you try to get back online it's in 'quiet
> mode'. What I do is to break network connection at PC, then power cycle the
> cable modem/router, enable network again.
I will give that a try next time.
> http://technet.microsoft.com/en-us/library/cc958919.aspx
> If the lease expires and no server has been contacted, the client must
> immediately discontinue using its leased IP address. The client then
> proceeds to follow the same process used during its initial startup to
> obtain a new IP address lease.
Hmmm, since it is my router that must follow this perhaps it needs an
update!
> Text message explanations:
> http://www.dslreports.com/forum/r19913728-TWC-Have-a-question-on-Modem-Logs
Thanks!