Ooops, forgot the logfile snapshot:

Jan 14 23:45:39     dhclient: New Routers (xl0): 88.134.151.254
Jan 14 23:45:39     dhclient: No working leases in persistent database - 
sleeping.
Jan 14 23:45:38     dhclient: New Routers (xl0): 88.134.151.254
Jan 14 23:45:38     dhclient: New Broadcast Address (xl0): 255.255.255.255
Jan 14 23:45:38     dhclient: New Subnet Mask (xl0): 255.255.254.0
Jan 14 23:45:38     dhclient: New IP Address (xl0): 88.134.151.111
Jan 14 23:45:38     dhclient: Trying recorded lease 88.134.151.111
Jan 14 23:45:38     dhclient: No DHCPOFFERS received.
Jan 14 23:45:33     dhclient: DHCPDISCOVER on xl0 to 255.255.255.255 
port 67 interval 5
Jan 14 23:45:17     dhclient: DHCPDISCOVER on xl0 to 255.255.255.255 
port 67 interval 16
Jan 14 23:44:58     dhclient: DHCPDISCOVER on xl0 to 255.255.255.255 
port 67 interval 19
Jan 14 23:44:47     dhclient: DHCPDISCOVER on xl0 to 255.255.255.255 
port 67 interval 11
Jan 14 23:44:41     dhclient: DHCPDISCOVER on xl0 to 255.255.255.255 
port 67 interval 6
Jan 14 23:44:37     dhclient: DHCPDISCOVER on xl0 to 255.255.255.255 
port 67 interval 4
Jan 14 23:44:29     dhclient: DHCPREQUEST on xl0 to 83.169.185.50 port 67
Jan 14 23:44:22     dhclient: DHCPREQUEST on xl0 to 83.169.185.50 port 67
Jan 14 23:05:33     dhclient: bound to 88.134.151.111 -- renewal in 2329 
seconds.
Jan 14 23:05:32     dhclient: DHCPACK from 83.169.185.50
Jan 14 23:05:32     dhclient: DHCPREQUEST on xl0 to 83.169.185.50 port 67


Additional information:
Somebody at a messageboard mentioned to me that he had a similar 
problem. When he changed to pfSense it went away.
Yet somebody else mentioned that he had a similar problem because the 
NIC on his mainboard had a MAC adress which was used widely on the 
Internet. When he changed that MAC, the problem went away. Now I tried 
the "MAC spoofing" feature of m0n0wall, my problem persists.

Greetings
Carsten Holbach


Carsten Holbach schrieb:
> Hello
>
> My internet connection runs over Kabel Deutschland, which is a cable 
> provider here in Germany (guess the name :-))
>
> Since some week I have a problem:
> Every night between 11:50pm and 0:10am the m0n0wall will lose it's WAN 
> IP adress. It tries to renew it via DHCP, but it won't receive one.
> My first guess was that my provider may have a problem with the 
> DHCP-server. But I connected my PC the cable modem directly for some 
> days, and the problem went away. Back to m0n0wall (a new box with 
> different NICs), and the problem showed up again.
>
> Here's a snapshot of the log files (an older one, before I connected 
> my PC to the cablemodem directly):
>
>
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