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ipflog entries? - FreeBSD

Greetings My daily mail on my firewall (5.3-rel-p4) has always shown many (> 10000) blocks by my blocking rule "block in quick on em0 from 10.0.0.0/8 to any". Obviously I'm using ipf/ipnat. So, for education, today I enabled "log" for a short time on that rule. Within a few minutes I logged over twenty attempts from the same address. (Sample below, text attached) 04/04/2005 11:33:41.034653 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN 04/04/2005 11:33:41.973120 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 344 IN 04/04/2005 11:33:57.532249 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR ...

  1. #1

    Default ipflog entries?

    Greetings

    My daily mail on my firewall (5.3-rel-p4) has always shown many (>
    10000) blocks by my blocking rule
    "block in quick on em0 from 10.0.0.0/8 to any". Obviously I'm using
    ipf/ipnat.

    So, for education, today I enabled "log" for a short time on that rule.
    Within a few minutes I logged over twenty
    attempts from the same address. (Sample below, text attached)

    04/04/2005 11:33:41.034653 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68
    PR udp len 20 337 IN
    04/04/2005 11:33:41.973120 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68
    PR udp len 20 344 IN
    04/04/2005 11:33:57.532249 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68
    PR udp len 20 337 IN
    04/04/2005 11:33:58.963415 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68
    PR udp len 20 344 IN

    Ports 67 shows dhcps and 68 shows dhcpc in /etc/services.

    em0 is connected to my roadrunner cable modem. Is the cable modem doing
    this or is someone spoofing this IP address?

    Sorry if this has been answered already but I'm kind of new to the
    firewall stuff.

    Thank you for your time.
    Robert

    04/04/2005 11:32:13.544747 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:32:22.045132 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:32:38.544230 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:33:23.043437 2x em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:33:25.553000 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:33:27.822447 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:33:29.962973 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 344 IN
    04/04/2005 11:33:32.535749 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:33:34.952726 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 344 IN
    04/04/2005 11:33:38.027073 em0 0:6 b 218.83.155.71,55197 -> 66.8.191.104,1029 PR udp len 20 459 IN
    04/04/2005 11:33:41.034653 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:33:41.973120 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 344 IN
    04/04/2005 11:33:57.532249 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:33:58.963415 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 344 IN
    04/04/2005 11:34:27.203702 2x em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 341 IN
    04/04/2005 11:34:34.461616 em0 0:6 b 24.90.91.53,15851 -> 66.8.191.104,42 PR tcp len 20 48 -S IN
    04/04/2005 11:34:37.463380 em0 0:6 b 24.90.91.53,15851 -> 66.8.191.104,42 PR tcp len 20 48 -S IN
    04/04/2005 11:34:42.021349 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:34:42.804996 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:34:44.532057 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:34:46.807355 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:34:51.521685 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:35:00.022081 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:35:16.541624 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:35:36.322489 2x em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 342 IN
    04/04/2005 11:35:59.813198 2x em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 353 IN
    04/04/2005 11:36:01.020881 2x em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:36:03.510580 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:36:05.801901 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:36:10.510708 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:36:19.010118 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:36:35.511583 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:37:08.834639 em0 0:6 b 60.34.114.40,2861 -> 66.8.191.104,5554 PR tcp len 20 48 -S IN
    04/04/2005 11:37:09.835071 em0 0:6 b 60.34.114.40,3093 -> 66.8.191.104,1023 PR tcp len 20 48 -S IN
    04/04/2005 11:37:11.841033 em0 0:6 b 60.34.114.40,3634 -> 66.8.191.104,9898 PR tcp len 20 48 -S IN
    04/04/2005 11:37:21.010605 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:37:21.788276 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:37:23.499794 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:37:25.791626 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:37:30.509418 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:37:38.999829 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    04/04/2005 11:37:55.499265 em0 0:3 b 10.96.0.1,67 -> 255.255.255.255,68 PR udp len 20 337 IN
    gateway#


    Robert Guest

  2. #2

    Default Re: ipflog entries?

    On Tuesday 05 April 2005 00:05, Robert Marella wrote: 

    It's your cable provider insisting to send you bootps info (for broken windows
    customers I reckon). Yech that's as if you're some network appliance :) Mine
    does that too. I just drop/not log them. Whenever your dhclient needs to
    renew a lease it will connect and if your firewall keeps state on that your
    ISP's dhcp server has it's lucky moment because for once something may
    connect back in. Both of you happy.

    HTH,

    Dan



    Danny Guest

  3. #3

    Default Re: ipflog entries?

    Danny Pansters wrote:
     
    >
    >It's your cable provider insisting to send you bootps info (for broken windows
    >customers I reckon). Yech that's as if you're some network appliance :) Mine
    >does that too. I just drop/not log them. Whenever your dhclient needs to
    >renew a lease it will connect and if your firewall keeps state on that your
    >ISP's dhcp server has it's lucky moment because for once something may
    >connect back in. Both of you happy.
    >
    >HTH,
    >
    >Dan
    >
    >
    >[/ref]
    Thanks Dan.

    I kinda thunk it was something like that. Just wanted someone such as
    yourself to confirm. The sheer number that was reported in the daily
    mail was what got me concerned. I was and am just dropping them. I only
    enabled the log for about 5 minutes.

    Thanks again
    Robert

    Robert Guest

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