I have a LAN at home:
Comcast cable internet
Motorola SB5100 cable modem
Cable / DSL 4 port router (wired)
5-port switch
multiple PCs connected to the switch / router.
First, here are the symptoms:
Router is a Linksys BEFSR41 v3. It gets assigned a WAN IP address and the whole works. The PCs get assigned IPs from the DHCP server. However, none of the PCs can see each other, but the PCs can access the router and the cable modem.
I disabled/changed the MAC address cloning (accidentally) and since I am no longer using the PC that I originally set up the network with, the cloned address is different. I noticed that it resulted in the router refusing to get assigned a WAN IP address from the cable modem. I am using Comcast - do they set it so the cable modem only works with 1 certain MAC address on the router (the first one it sees)?
Prior to me fudging with the cloned MAC address, everything LOOKED normal except the PCs could not access the internet or the LAN (other than the cable modem and router). When I changed the cloned MAC address, the rotuer did not get a WAN IP address.
My Linksys router acted up about 1-2 months ago so I bought a D-link DI-604. It lasted about 2 weeks when the same thing happened. It would not get assigned a WAN IP address and I ended up returning the D-link for a refund. I noticed that I had to use the same cloned MAC address as the Linksys (which is cloned from a PC card on a laptop that I no longer use) in order for it to get assigned a WAN IP but eventually even that did not work.
I discovered this problem in the morning right before I had to go to work, so I have no way of checking things here and there, so if you have questions I can answer them off the top of my head. Right now, I am considering either:
1). Buying a new router
2). Swapping in an old Linksys BEFSR41 v1 router and cloning the MAC address of the PC card
3). Calling Comcast and asking them about the MAC address thing
4). Hooking up a laptop directly to the cable modem
Here are some other pertinent notes that may or may not be related:
1). My cable signal has been on the fritz for over a month. Ch 2-4 sometimes come on fuzzy and when it does, my cable modem loses its signal. It comes back. I noticed that it did this last summer when there was major construction in the area. This year, there is another major construction site in the area.
2). Two router "failures" within 3 months is too much to be a coincidence... The Linksys router is 3 years old and the D-Link was brand new. There are other people in the house that watch streaming video programs - did this overload the router? They do this for approximately 4-6 hours a day. I can't imagine it doing this since I usually play online games for a few hours a day for several years...
Thanks in advance.
Comcast cable internet
Motorola SB5100 cable modem
Cable / DSL 4 port router (wired)
5-port switch
multiple PCs connected to the switch / router.
First, here are the symptoms:
Router is a Linksys BEFSR41 v3. It gets assigned a WAN IP address and the whole works. The PCs get assigned IPs from the DHCP server. However, none of the PCs can see each other, but the PCs can access the router and the cable modem.
I disabled/changed the MAC address cloning (accidentally) and since I am no longer using the PC that I originally set up the network with, the cloned address is different. I noticed that it resulted in the router refusing to get assigned a WAN IP address from the cable modem. I am using Comcast - do they set it so the cable modem only works with 1 certain MAC address on the router (the first one it sees)?
Prior to me fudging with the cloned MAC address, everything LOOKED normal except the PCs could not access the internet or the LAN (other than the cable modem and router). When I changed the cloned MAC address, the rotuer did not get a WAN IP address.
My Linksys router acted up about 1-2 months ago so I bought a D-link DI-604. It lasted about 2 weeks when the same thing happened. It would not get assigned a WAN IP address and I ended up returning the D-link for a refund. I noticed that I had to use the same cloned MAC address as the Linksys (which is cloned from a PC card on a laptop that I no longer use) in order for it to get assigned a WAN IP but eventually even that did not work.
I discovered this problem in the morning right before I had to go to work, so I have no way of checking things here and there, so if you have questions I can answer them off the top of my head. Right now, I am considering either:
1). Buying a new router
2). Swapping in an old Linksys BEFSR41 v1 router and cloning the MAC address of the PC card
3). Calling Comcast and asking them about the MAC address thing
4). Hooking up a laptop directly to the cable modem
Here are some other pertinent notes that may or may not be related:
1). My cable signal has been on the fritz for over a month. Ch 2-4 sometimes come on fuzzy and when it does, my cable modem loses its signal. It comes back. I noticed that it did this last summer when there was major construction in the area. This year, there is another major construction site in the area.
2). Two router "failures" within 3 months is too much to be a coincidence... The Linksys router is 3 years old and the D-Link was brand new. There are other people in the house that watch streaming video programs - did this overload the router? They do this for approximately 4-6 hours a day. I can't imagine it doing this since I usually play online games for a few hours a day for several years...
Thanks in advance.
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