Question about Arris SURFboard® SB5101 Cable Modem
There is a configuration facility included with the modem that you should be able to access to help troubleshoot the connection.
The Cable Modem has three active interfaces, the HFC, the Ethernet and the USB and each
interface has both a MAC and an IP address associated with it. When operating normally it is the
IP address of the HFC interface that is used for diagnostic access to the modem. However the IP
address associated with the Ethernet interface is always available to the client side network,
unless it has been disabled by management command. This means that a PC on the client side
can access the WEB pages within the modem using the reserved address 192.168.100.1. This is
a non-routed address so it cannot be reached from the Internet (routed) side of the network
The SB5100 family of modems contain an internal DHCP server, which is active until the modem
registers with the CMTS. In the case of a problem that prevents the modem from completing its
registration, the modem can still give an IP address to the client PC to enable diagnostics access.
This address is given with a very short lease (around 10 seconds) so that as soon as the
registration does complete the client PC obtains its proper IP address from the core network
Posted on Mar 24, 2017
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Posted on Jan 02, 2017
SOURCE: cable modem + dlink router
Your modem needs to be rebooted in order for your router to pull an IP from the modem. To do this, look for a little hole in the back of your modem and use a pen to push the button. Wait for the reboot to finish and then try again in about 20 seconds.
Posted on Jan 20, 2008
when you are on Cable Internet with a "modem" only connected directly to the computer, what the ISP see is the computer's MAC Address (command prompt -> type ipconfig and hit enter).
put a router (which has it's own MAC Address) in-between and the ISP wont let you cause it sees the router not the computer.
check physical connection: cable modem -> router -> computer(hard wire for this troubleshooting)
access the d-link gui and locate the “Clone MAC Address" button (supposed to clone the computers MAC Address - verify if it's the same), save settings & reboot the router.
Posted on Jan 26, 2009
SOURCE: Unable to set up wireless router
Shut down your computer, unplug the cable modem and the switch. Connect all three - computer to switch, switch to modem. Make sure that the ethernet cable between the router and the modem is in the router uplink port and that the computer is plugged into one of the four ports that look alike. Wait 30 seconds - plug in the modem. Wait another 30 seconds, plug in the router, wait another 30 seconds and boot the computer. Open a browser and see if you have internet access. If you still don't, then try to check the browser by typing 192.168.1.1 into the address bar of the browser. That should give you the browser sign in screen. The Linksys default is to leave the user name blank and type admin for the password. That should give you access to the router so you can check the settings. If this doesn't work, document carefully what happens and post again with your results and we'll try to go from there.
Posted on Jun 08, 2009
I have a similar problem. The common denominator seems to be the SB5101. I have a brand new Belkin Surf 300N, same issue. The modem will not give DHCP to the router. I can connect fine via ethernet to the modem directly.
This modem seems to be a dinosaur.
Posted on Aug 06, 2010
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