cable modem and ISA 2004
- From: bgreg <bgreg@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 4 Aug 2008 15:46:13 -0700
Recently switched from Verizon DSL to cable modem provided by Cablevision in
NJ. With DSL I had external NIC set to 192.168.1.3 and connected patch cable
to DSL modem/router at 192.168.1.1. Inside nic to 172.25.10.3. Worked well
for years. With cable config using cable modem Motorola SBV5222 a router must
be used. Purchased Linksys BESFR41. From ethernet port of cable modem I
connect to ethernet port of Linksys router. IP address of cable modem is
192.168.100.1 so I configured ethernet port of Linksys to 192.168.100.5 and
external nic to 192.168.100.3, 255.255.255.0 with gateway
192.168.100.5(Linksys)I logged in to linksys and get external address and DNS
listed as 167.206.245.129 & .130. Have rerun CEICW mutiple times using DNS
addresses listed by Linksys. I cannot get out to internet at server or any
workstations on LAN. If I connect LAN card directly to cable modem and allow
DHCP at LAN card, I can connect. Same occurs at at workstation. I 've
observed logging at ISA 2004 and connection is opened and closed at port 53.
It seems that it is being blocked. Anyone had similar problems with Cable
modem /cable ISP blocking specific ports. Ports are listed open (stealth
mode) via GRC's Shields up. Anyone experienced similar issues?
.
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