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DHCP via CableModem not working

Hello,

I have a strange problem:
When I connect the ASG to my cablemodem, the ASG won't get an IP from DHCP (see log 1).

But there is one way to get an IP: I connect another router (e.g. a cheap Netgear WNR1000) to the cablemodem and the router will get an IP from DHCP.
Then I have to change the MAC of the ASG to the MAC of the router.
When I then pull out the network cable and put it in the ASG, the ASG will get an IP from DHCP! (log 2)

I contacted my ISP and he's only checking the MAC - no additional security - so every router should work.
And yes: I can use another router with no problems.
Or I can change the virtual MAC of a router to get a new IP.

Only the ASG is causing problems.
Is this a known bug? What can I try?

Log 1:
2012:09:24-19:33:11 home dhclient: Internet Systems Consortium DHCP Client 4.1-ESV-R3
2012:09:24-19:33:11 home dhclient: Copyright 2004-2011 Internet Systems Consortium.
2012:09:24-19:33:11 home dhclient: All rights reserved.
2012:09:24-19:33:11 home dhclient: For info, please visit https://www.isc.org/software/dhcp/
2012:09:24-19:33:11 home dhclient:
2012:09:24-19:33:11 home dhclient: Listening on LPF/eth0/20:4e:7f:xx:xx:xx
2012:09:24-19:33:11 home dhclient: Sending on LPF/eth0/20:4e:7f:xx:xx:xx
2012:09:24-19:33:11 home dhclient: Sending on Socket/fallback
2012:09:24-19:33:11 home dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5
2012:09:24-19:33:16 home dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7
2012:09:24-19:33:23 home dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 7
2012:09:24-19:33:30 home dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 9
2012:09:24-19:33:39 home dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 9
2012:09:24-19:33:48 home dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 13
2012:09:24-19:34:01 home dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11
2012:09:24-19:34:12 home dhclient: No DHCPOFFERS received.
2012:09:24-19:34:12 home dhclient: No working leases in persistent database - sleeping.

Log 2:
2012:09:24-19:55:35 home dhcpc-sh: starting DHCP client
2012:09:24-19:55:35 home dhclient: Internet Systems Consortium DHCP Client 4.1-ESV-R3
2012:09:24-19:55:35 home dhclient: Copyright 2004-2011 Internet Systems Consortium.
2012:09:24-19:55:35 home dhclient: All rights reserved.
2012:09:24-19:55:35 home dhclient: For info, please visit https://www.isc.org/software/dhcp/
2012:09:24-19:55:35 home dhclient:
2012:09:24-19:55:35 home dhclient: Listening on LPF/eth0/20:4e:7f:xx:xx:xx
2012:09:24-19:55:35 home dhclient: Sending on LPF/eth0/20:4e:7f:xx:xx:xx
2012:09:24-19:55:35 home dhclient: Sending on Socket/fallback
2012:09:24-19:55:35 home dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5
2012:09:24-19:55:36 home dhclient: DHCPREQUEST on eth0 to 255.255.255.255 port 67
2012:09:24-19:55:36 home dhclient: DHCPOFFER from xx.xx.xx.xx
2012:09:24-19:55:37 home dhclient: DHCPACK from xx.xx.xx.xx
2012:09:24-19:55:37 home dhclient: bound to yy.yy.yy.yy -- renewal in 19327 seconds.


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Parents
  • Hi, Swift42, and welcome to the User BB!

    If you've searched here, you know that no one else is having this problem, so we can assume that this is specific to your situation.  Maybe it's your NIC - what brand/model is it?  When you power-cycle the cable modem, how long do you leave it off - a full minute?

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
Reply
  • Hi, Swift42, and welcome to the User BB!

    If you've searched here, you know that no one else is having this problem, so we can assume that this is specific to your situation.  Maybe it's your NIC - what brand/model is it?  When you power-cycle the cable modem, how long do you leave it off - a full minute?

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
Children
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