Andy said:
I found out that I have to disconnect power to modem for 30 seconds when connecting direct from modem to computer.
Is this enuf to show that there is no hardware issue ?
Andy
Model: Cisco DPC3008
Vendor: Cisco
Hardware Revision: 1.0
Serial Number: M
MAC Address:
Bootloader Revision: 2.3.1_R3
Current Software Revision: d3000-v302r125532-120517a-L2VPN-CMCST
Firmware Name: d3000-v302r125532-120517a-L2VPN-CMCST.bin
Firmware Build Time: May 17 11:31:04 2012
Cable Modem Status: Operational
Wireless Network:
Results from a Direct from computer to cable modem
Pinging 192.168.100.1 with 32 bytes of data:
Reply from 192.168.100.1: bytes=32 time<1ms TTL=64
Reply from 192.168.100.1: bytes=32 time<1ms TTL=64
Reply from 192.168.100.1: bytes=32 time<1ms TTL=64
Reply from 192.168.100.1: bytes=32 time<1ms TTL=64
Ping statistics for 192.168.100.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
OK, so I'm working on the stick diagram. This is
what I have so far.
192.168.100.1
1xEthernet
Comcast ----- Cisco DPC3008 ------------------ Router Wired ------- Computer
Cable Modem -----X and WiFi, Model
1xUSB number unknown
(Where I got my details on the cable modem...)
http://www.cisco.com/web/consumer/products/gatemod-dpc3000.html#~specifications
Now, you're telling me you connected the computer to the
cable modem directly, and pinged it. If you want to
continue testing this...
192.168.100.1
1xEthernet
Comcast ----- Cisco DPC3008 --------------------------------------- Computer
Cable Modem -----X
1xUSB
.... you can try pinging something on the Internet,
or use the browser and prove you can reach some sites.
ping
www.sun.com
I picked that one, because in the past it only
seemed to have one IP mapping.
You could also use something like Speedtest.net or
one of the other network speed testing sites. I
see there is a
http://speedtest.comcast.net/
available. You could try your browser on that site,
and see if you can get a reading of network speed. If
it runs at a decent speed, you've done a pretty good test
of the modem and "pipes".
*******
OK, so let's say that the testing of the direct connection
works. Then we should go back to the "full" setup.
192.168.100.1
1xEthernet
Comcast ----- Cisco DPC3008 ------------------ Router Wired ------- Computer
Cable Modem -----X and WiFi, Model
1xUSB number unknown
On the computer at this point, I would want to check the IP address
of the computer. In Command Prompt, try
ipconfig
On my computer, I'd get
192.168.1.1
but your setup could be different. The addresses are 192.168.x.x,
where you can select say 192.168.2.x subnet if you want. It doesn't
have to be 192.168.1.x. In any case, I'd probably avoid 192.168.100.x,
because the path between the Cisco and your separate router,
is using that. I have a setup similar to the diagram, in that
I use modem box and a separate router, and the subnets on either
side use different numeric values. (I.e. 192.168.100.x on the WAN
side of the router, and 192.168.1.x on the LAN side.)
So when you do ipconfig, the number that comes back can tell
you something about the setup. (It tells you whether the
computer was able to do the DHCP address thing with the router
or not. The value tells you whether it succeeded.) If you get
an APIPA address, then maybe the router is ignoring you, or
the Ethernet wire is broken etc.
Let's say your computer has a "nice" ipconfig value, and you're
ready to move on. Now, it's time to ping the router. But
since we don't know anything about the router at this point,
we don't know if it's at 10.x.x.x or 192.168.1.1 or where
it's at. The documentation may tell us something.
Actually, I had a program once, that would scan all possible IPV4
addresses, looking for a response. So if somebody set the
router to some goofy value (as a joke), it might take all night,
but you can find the address without resetting the router.
If you absolutely can't contact the router (using the known
address), then you can reset it.
If you can figure out the address of the router, then log into
it and check the configuration. I'm using what I think is
an unroutable address here, just as an example value. I think
I've run into at least one product, that used an address like
this. Sometimes, the router has a symbolic address rather
than a number, because they think it's easier to remember.
I can't remember the symbolic value for mine - I'd have
to look it up. Remember, we're trying to figure out the
address of the router, so we can log in.
http://10.0.0.1
You'll be prompted for username and password.
[ The router can have five Ethernet ports (as an example).
Four of the ports are one color, and are on the LAN side.
Those ports are where you connect the computer. The fifth
port is labeled "WAN" and that port connects to the cable
modem. Since the cable modem has a GbE port with MDIX on it,
you don't have to worry about Ethernet cable type. Connect
the WAN port on the router, to the cable modems single
Ethernet port. ]
OK, so if you can log into the router, you can browse through
the settings.
If you tell me the router model number, I can take a
quick peek at the manual...
Paul
