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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
  • Just a followup:
    I finally de-bricked my Buffalo wzr-hp-ag300h and was able to put it in front of the UTM.  I let the UTM update from 9.000-8 all the way to 9.004-33 and lo-and behold, it was able to pull and IP from my ISP.
Reply
  • Just a followup:
    I finally de-bricked my Buffalo wzr-hp-ag300h and was able to put it in front of the UTM.  I let the UTM update from 9.000-8 all the way to 9.004-33 and lo-and behold, it was able to pull and IP from my ISP.
Children
  • Resurrecting this old thread.  I got hit by this bug many years ago... and it might have re-surfaced?  Currently I am on 9.355-1.  

    I am wondering this time if it isn't simply that the External interface gives up too quickly/easily trying to get a DHCP offer back.

    I am looking for the dhclient.conf or equivalent on my UTM.  For now, double natting using my cable modem in Router mode.