- Need Help with Surfboard 5100 Modem
- Posted by mcp6453 on November 1st, 2004
Will a Surfboard 5100 server as a router? It has a DHCP server built in,
but two computers connected through a switch are not able to get IP
addresses. I read somewhere that the Surfboard is not really a router
unless the cable is down. The one machine that is work is pulling a
public IP. The other machine is not able to get an IP address ("server
unreachable.")
At one point, the cable was, in fact, down, and the working machine
pulled a private IP address.
What's going on with this unit?
Thanks!
- Posted by Warren on November 1st, 2004
mcp6453 wrote:
The 5100 is not a router. It will, however, act as a DHCP server, and
assign IP addresses when there is no active coax connection. You may
need to release and renew the IP on a machine connected to the
cablemodem to be served an address.
Make sure that you are releasing and renewing for the correct adapter.
If, for example, you have an internal dial-up modem installed, renewing
all connections will also attempt to renew a lease via the dial-up
adapter (PPP adapter) and you'll receive a server unreachable error.
Release/renew only the Ethernet adapter's connection.
The IP addresses served by the cablemodem will be 192.168.100.11,
192.168.100.12, etc.
--
Warren H.
==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.
Blatant Plug: Black & Decker Landscaping Tools & Parts:
http://www.holzemville.com/mall/blackanddecker
- Posted by James Knott on November 1st, 2004
mcp6453 wrote:
I just tried an experiment. I connected both my Linux firewall and notebook
computers, to my modem via a hub. When the modem is off line, both
computers can get an address from it and communicate. However, shortly
after switching the modem back on line, the notebook loses it's address and
the firewall reverts to it's original address.
--
(This space intentionally left blank)
- Posted by Bit Twister on November 1st, 2004
On Mon, 01 Nov 2004 13:15:38 -0500, James Knott wrote:
Yep, if you buy more ip addresses from rogers.com both would run on
the cable modem. Or buy a router not a hub and you can run both
through the single ip address.
- Posted by James Knott on November 1st, 2004
Bit Twister wrote:
As I mentioned, I have a firewall I built myself, using Linux. In addition
to the ethernet ports for the local network and wan, I've also got another
nic for my wifi, a vpn and dial in access. You won't find many cheap
firewall/router boxes that do all that.
--
(This space intentionally left blank)
- Posted by Bit Twister on November 1st, 2004
On Mon, 01 Nov 2004 16:47:10 -0500, James Knott wrote:
Agree, I also run linux as my firewall box and do not have to worry
about a virus disabling the firewall. 
http://news.zdnet.co.uk/internet/sec...9172165,00.htm
- Posted by James Knott on November 2nd, 2004
Bit Twister wrote:
The SB5100 comes with a standby switch, that disconnects the local side,
from the internet. It might be a good idea for Windows users to make use
of it.
--
(This space intentionally left blank)
- Posted by Bit Twister on November 2nd, 2004
On Tue, 02 Nov 2004 10:38:15 -0500, James Knott wrote:
Yes, that standby switch is a very good firewall. 8-)
But average time for an windows infection is 16 minutes after connecting
to the net with a new box. That is quicker than downloading the
updates.
For new virues they have to wait for an AV vendor to catch the virus,
test the detection/cleanup, load into the production database, and
sometime later the customer loads the update to stop the malware. 
