Re: What is my router trying to tell me?

Discussion in 'Computer Security' started by claudel, Jun 14, 2005.

  1. claudel

    claudel Guest

    In article <NSwre.9112$>,
    Paul H <> wrote:
    >Not sure if this is OT because I don't know what is happening!
    >
    >Every day my router log is full up with the following, What does it all
    >mean?
    >
    >14 June 2005 08:39:54 DHCP:ack(DOL=60,T1=30,T2=53)
    >14 June 2005 08:24:55 DHCP:ack(DOL=60,T1=30,T2=53)
    >14 June 2005 08:25:26 DHCP:renew
    >14 June 2005 08:25:26 DHCP:ack(DOL=60,T1=30,T2=53)
    >14 June 2005 08:25:57 DHCP:renew
    >14 June 2005 08:25:57 DHCP:ack(DOL=60,T1=30,T2=53)
    >14 June 2005 08:26:28 DHCP:renew
    >14 June 2005 08:26:28 DHCP:ack(DOL=60,T1=30,T2=53)
    >14 June 2005 08:26:59 DHCP:renew
    >14 June 2005 08:26:59 DHCP:ack(DOL=60,T1=30,T2=53)
    >14 June 2005 08:27:30 DHCP:renew
    >14 June 2005 08:27:30 DHCP:ack(DOL=60,T1=30,T2=53)
    >14 June 2005 08:28:01 DHCP:renew
    >14 June 2005 08:28:01 DHCP:ack(DOL=60,T1=30,T2=53)
    >14 June 2005 08:28:32 DHCP:renew
    >14 June 2005 08:28:32 DHCP:ack(DOL=60,T1=30,T2=53)
    >14 June 2005 08:29:03 DHCP:renew
    >14 June 2005 08:29:03 DHCP:ack(DOL=60,T1=30,T2=53)
    >
    >Thanks,
    >
    >Paul
    >
    >


    It's telling you that your IP information is periodically being renewed.


    Claude
     
    claudel, Jun 14, 2005
    #1
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  2. claudel

    Gerard Bok Guest

    On Tue, 14 Jun 2005 16:53:21 GMT,
    (claudel) wrote:

    >In article <NSwre.9112$>,
    >Paul H <> wrote:
    >>Not sure if this is OT because I don't know what is happening!
    >>
    >>Every day my router log is full up with the following, What does it all
    >>mean?
    >>
    >>14 June 2005 08:39:54 DHCP:ack(DOL=60,T1=30,T2=53)
    >>14 June 2005 08:24:55 DHCP:ack(DOL=60,T1=30,T2=53)
    >>14 June 2005 08:25:26 DHCP:renew
    >>14 June 2005 08:25:26 DHCP:ack(DOL=60,T1=30,T2=53)
    >>14 June 2005 08:25:57 DHCP:renew
    >>14 June 2005 08:25:57 DHCP:ack(DOL=60,T1=30,T2=53)
    >>14 June 2005 08:26:28 DHCP:renew
    >>14 June 2005 08:26:28 DHCP:ack(DOL=60,T1=30,T2=53)
    >>14 June 2005 08:26:59 DHCP:renew
    >>14 June 2005 08:26:59 DHCP:ack(DOL=60,T1=30,T2=53)
    >>14 June 2005 08:27:30 DHCP:renew
    >>14 June 2005 08:27:30 DHCP:ack(DOL=60,T1=30,T2=53)
    >>14 June 2005 08:28:01 DHCP:renew
    >>14 June 2005 08:28:01 DHCP:ack(DOL=60,T1=30,T2=53)
    >>14 June 2005 08:28:32 DHCP:renew
    >>14 June 2005 08:28:32 DHCP:ack(DOL=60,T1=30,T2=53)
    >>14 June 2005 08:29:03 DHCP:renew
    >>14 June 2005 08:29:03 DHCP:ack(DOL=60,T1=30,T2=53)


    >It's telling you that your IP information is periodically being renewed.
    >


    If that is the only cause, the router is telling you that 60
    seconds is a pretty short lease :)

    If the OP does not know what this report is telling him, it is
    not likely that he has modified the leasetime to be 60 seconds.

    If I found this log on my network, I would investigate it too!

    --
    Kind regards,
    Gerard Bok
     
    Gerard Bok, Jun 14, 2005
    #2
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  3. claudel

    Steve Welsh Guest

    I think I might be thinking - 'what a tight-arsed ISP I have'.

    DHCP lease renewal set at 31 secs (not 1 minute as far as I can see).

    Get yourself a static IP address, and then get some protection to hide
    behind.

    :) Steve

    claudel wrote:
    > In article <>,
    > Gerard Bok <> wrote:
    >
    >>On Tue, 14 Jun 2005 16:53:21 GMT,
    >>(claudel) wrote:
    >>
    >>
    >>>In article <NSwre.9112$>,
    >>>Paul H <> wrote:
    >>>
    >>>>Not sure if this is OT because I don't know what is happening!
    >>>>
    >>>>Every day my router log is full up with the following, What does it all
    >>>>mean?
    >>>>
    >>>>14 June 2005 08:39:54 DHCP:ack(DOL=60,T1=30,T2=53)
    >>>>14 June 2005 08:24:55 DHCP:ack(DOL=60,T1=30,T2=53)
    >>>>14 June 2005 08:25:26 DHCP:renew
    >>>>14 June 2005 08:25:26 DHCP:ack(DOL=60,T1=30,T2=53)
    >>>>14 June 2005 08:25:57 DHCP:renew
    >>>>14 June 2005 08:25:57 DHCP:ack(DOL=60,T1=30,T2=53)
    >>>>14 June 2005 08:26:28 DHCP:renew
    >>>>14 June 2005 08:26:28 DHCP:ack(DOL=60,T1=30,T2=53)
    >>>>14 June 2005 08:26:59 DHCP:renew
    >>>>14 June 2005 08:26:59 DHCP:ack(DOL=60,T1=30,T2=53)
    >>>>14 June 2005 08:27:30 DHCP:renew
    >>>>14 June 2005 08:27:30 DHCP:ack(DOL=60,T1=30,T2=53)
    >>>>14 June 2005 08:28:01 DHCP:renew
    >>>>14 June 2005 08:28:01 DHCP:ack(DOL=60,T1=30,T2=53)
    >>>>14 June 2005 08:28:32 DHCP:renew
    >>>>14 June 2005 08:28:32 DHCP:ack(DOL=60,T1=30,T2=53)
    >>>>14 June 2005 08:29:03 DHCP:renew
    >>>>14 June 2005 08:29:03 DHCP:ack(DOL=60,T1=30,T2=53)

    >>
    >>>It's telling you that your IP information is periodically being renewed.
    >>>

    >>
    >>If that is the only cause, the router is telling you that 60
    >>seconds is a pretty short lease :)
    >>
    >>If the OP does not know what this report is telling him, it is
    >>not likely that he has modified the leasetime to be 60 seconds.
    >>
    >>If I found this log on my network, I would investigate it too!
    >>

    >
    >
    > True, but I'd suspect a misconfiguration before malice...
    >
    >
    > Claude
    >
     
    Steve Welsh, Jun 15, 2005
    #3
  4. claudel

    Gerard Bok Guest

    On Wed, 15 Jun 2005 00:34:54 +0100, Steve Welsh <>
    wrote:

    >I think I might be thinking - 'what a tight-arsed ISP I have'.
    >
    >DHCP lease renewal set at 31 secs (not 1 minute as far as I can see).


    Yes, 1 minute it is.
    DHCP starts requesting a refresh at half way :)

    >>>>>Every day my router log is full up with the following, What does it all
    >>>>>mean?
    >>>>>
    >>>>>14 June 2005 08:39:54 DHCP:ack(DOL=60,T1=30,T2=53)
    >>>>>14 June 2005 08:24:55 DHCP:ack(DOL=60,T1=30,T2=53)
    >>>>>14 June 2005 08:25:26 DHCP:renew
    >>>>>14 June 2005 08:25:26 DHCP:ack(DOL=60,T1=30,T2=53)
    >>>>>14 June 2005 08:25:57 DHCP:renew


    --
    Kind regards,
    Gerard Bok
     
    Gerard Bok, Jun 15, 2005
    #4
  5. claudel

    Chris Salter Guest

    Gerard Bok wrote:

    >>
    >>DHCP lease renewal set at 31 secs (not 1 minute as far as I can see).

    >
    >
    > Yes, 1 minute it is.
    > DHCP starts requesting a refresh at half way :)


    <anal mode on>

    No Steve is correct, DHCP lease time and DHCP lease renewal are seperate.

    --
    Chris Salter
     
    Chris Salter, Jun 15, 2005
    #5
  6. claudel

    Paul H Guest


    > Gerard Bok wrote:
    >
    >>>
    >>>DHCP lease renewal set at 31 secs (not 1 minute as far as I can see).

    >>
    >>
    >> Yes, 1 minute it is.
    >> DHCP starts requesting a refresh at half way :)

    >
    > <anal mode on>
    >
    > No Steve is correct, DHCP lease time and DHCP lease renewal are seperate.
    >
    > --
    > Chris Salter


    So am I disconnecting then reconnecting to the internet every 31 seconds?
     
    Paul H, Jun 15, 2005
    #6
  7. claudel

    Chris Salter Guest

    Paul H wrote:

    > So am I disconnecting then reconnecting to the internet every 31 seconds?


    14 June 2005 08:25:26 DHCP:renew
    14 June 2005 08:25:26 DHCP:ack(DOL=60,T1=30,T2=53)

    (assuming the log is from the router side NIC and not the internal nic)

    The log shows that the router is asking for renewal every 31 seconds.
    This is because the DHCP server is giving out a very low maximum DHCP lease.

    DOL=60 DHCP Maximum Lease
    T1 = 30 DHCP 1st Renew Time (50% maximum lease)
    T2 = 53 DHCP 2nd Try Renew Time (90% of maximum lease)

    The router isn't disconnecting from the internet, only asking for a
    renewal. This will makes surfing slower and there is wasted overhead.
    First off reboot your router, and see if the same problem occurs. If so
    contact your ISP

    --
    Chris Salter
     
    Chris Salter, Jun 15, 2005
    #7
  8. claudel

    Paul H Guest

    "Chris Salter" <> wrote in message
    news:...
    > Paul H wrote:
    >
    >> So am I disconnecting then reconnecting to the internet every 31 seconds?

    >
    > 14 June 2005 08:25:26 DHCP:renew
    > 14 June 2005 08:25:26 DHCP:ack(DOL=60,T1=30,T2=53)
    >
    > (assuming the log is from the router side NIC and not the internal nic)
    >
    > The log shows that the router is asking for renewal every 31 seconds. This
    > is because the DHCP server is giving out a very low maximum DHCP lease.
    >
    > DOL=60 DHCP Maximum Lease
    > T1 = 30 DHCP 1st Renew Time (50% maximum lease)
    > T2 = 53 DHCP 2nd Try Renew Time (90% of maximum lease)
    >
    > The router isn't disconnecting from the internet, only asking for a
    > renewal. This will makes surfing slower and there is wasted overhead.
    > First off reboot your router, and see if the same problem occurs. If so
    > contact your ISP
    >
    > --
    > Chris Salter


    Thanks for your help Chris :O)
     
    Paul H, Jun 16, 2005
    #8
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