Cable modem issue with m0n0wall

Hi,

Comcast is in the process of taking over my broadband service from 
Insight Communications.

Since switching to a Comcast address range, I have been having frequent 
problems with my Internet connection. In the log (the SW error should be 
irrelavent--they are trying to put motorala firmware in my Linksys 
modem) below is a typical sequence that repeats over and over while 
connected via m0n0wall...then, at 15:32, I connected a sacrificial XP 
machine directly to the cable modem at which point the modem properly 
synched up immediately. On the XP machine, the network interface had the 
following values:
IP            68.x.y.z
subnet      255.255.252.0
Gateway  68.x.a.b (within same subnet as IP)
DHCP      172.30.58.34
DNS        68.57.q.r
               68.57.q.r+1

I am guessing that the IP address of the DHCP server is giving me 
trouble. Any ideas? What else do I need to provide to complete this 
picture? (There is no route to 172.x.x.x in m0n0wall routing table.)

Same issues using a Linksys BEFCMU10 modem and a Motorala SB5100 modem.

One more question: Is there a way to force m0n0wall to release and renew 
DHCP on the WAN interface?

Thank you for any help.

Cyg

*Time*  *Priority*      *Description*
2004-08-03 15:32:24 	error 	SW upgrade Failed before download - Server 
not Present SW file:SB3100-1.4.9.0-SCM00-NOSH.NNDMN.p7 - SW 
server:172.30.58.35
2004-08-03 15:32:12 	notice 	SW Download INIT - Via Config file 
msb3100_v1_silver_c01 SW file:SB3100-1.4.9.0-SCM00-NOSH.NNDMN.p7 - SW 
server:172.30.58.35
2004-08-03 15:32:09     notice  Interface index:4 LinkUp
2004-08-03 15:32:09     notice  Interface index:3 LinkUp
2004-08-03 15:32:09     notice  Interface index:2 LinkUp
2004-08-03 15:32:09     information     Authorized MAC addr:XX XX XX XX XX XX
2004-08-03 15:32:08 	information 	Cable Modem Status set to Registration 
Complete
2004-08-03 15:32:08     information     Received REG-RSP from CMTS
2004-08-03 15:32:08     information     Sending Registration Request
2004-08-03 15:32:08     information     Processing Configuration File
2004-08-03 13:49:11     information     DHCP: IP complete
2004-08-03 13:49:11     information     DHCP: Syslog server not specified
2004-08-03 13:49:11     information     DHCP: Syslog server not specified
2004-08-03 13:49:11     debug   DHCP_coldstart() successfully
2004-08-03 13:49:09 	information 	Beginning ranging process. Initial 
Power=41.00 dBmV
2004-08-03 13:49:09 	information 	Got a map with the new UCD change 
count, and changed upstream parms
2004-08-03 13:49:05     information     Sync recovery loop is locked
2004-08-03 13:49:02     information     Scan Downstream Frequency...
2004-08-03 14:43:40 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:43:38 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:43:37 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:43:34 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:43:33 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:43:32 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:19:26 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:18:44 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:18:43 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:18:42 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:16:37 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:16:36 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:16:35 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:16:34 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:16:33 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:16:32 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:16:31 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:16:30 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 14:16:29 	critical 	Started Unicast Maintenance Ranging - No 
Response received - T3 time-out
2004-08-03 13:49:00     information     Authorized MAC addr:XX XX XX XX XX XX
2004-08-03 13:48:59 	information 	Cable Modem Status set to Registration 
Complete
2004-08-03 13:48:59     information     Received REG-RSP from CMTS
2004-08-03 13:48:59     information     Sending Registration Request
2004-08-03 13:48:59     information     Processing Configuration File
2004-08-03 13:48:58     information     DHCP: IP complete
2004-08-03 13:48:58     information     dfiedfiedfiedfiedfiedfiedfiedfied
2004-08-03 13:48:58     information     DHCP: Syslog server not specified
2004-08-03 13:48:57     debug   DHCP_coldstart() successfully
2004-08-03 13:48:55 	information 	Beginning ranging process. Initial 
Power=58.00 dBmV
2004-08-03 13:48:51     information     Sync recovery loop is locked
2004-08-03 13:48:47     information     Scan Downstream Frequency...
2004-08-03 13:48:45     information     DHCP: back to initial state