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CM500 will connect to only one router through ethernet switch
I connected a LInksys E3000 router to Comcast through a CM500 modem and TP 5-port gigabit ethernet switch by cloning the MAC address. No problem. But I can not get two other routers in different buildings to connect through CAT 5e cable I ran to them. Both an ASUS AC1900 roouter and an old Zonet or something aren't connecting, though I can see both networks from my home laptop. They don't work whether hardwired or through the router, whether Linux, Windows or Android. Only the Linksys works. I hooked up my working laptop directly to each ethernet cable at each building and it works fine, but laptops not configured with the Linksys will work at either building. I can't get an additional TrendNet TEW-651 router set up in my home, either. Only the Linksys works. Is this an IP address problem? What setting is off with this modem? Will this modem support only one router?
Thank you so much for the response. This explains it.
So, my Comcast ISP provides only one IP address. I bought a new modem to replace the rental modem from Xfinity, which had a router in it and worked fine. I didn't realize that the system wouldn't work with the new modem because it had been connected to the router in the modem, not the modem itself. I hooked up the ethernet switch to the router and it works fine now. Thanks you for the explanation.
The reason I'm doing this is because we have two renters on our property that I trenched CAT 5 cable to so they can share our internet service. One renter is hooked up to DISH TV, which we share. The other renter has just a router.
3 Replies
firestonesmith wrote:
...laptops not configured with the Linksys will work at either building.
I meant to say "WON'T work at either building."
> [...] Will this modem support only one router?
Most likely, _any_ modem in your environment will support only one
device (like one computer, or one NAT router). If your ISP connection
offers only one IP address, then you can connect one device (like, say,
a NAT router) to the modem. Other devices can be connected to that
router. If you try to connect multiple devices to the modem (using a
network switch), then only one of them will get a WAN IP address from
the ISP, and the others would essentially be ignored.
> [...] I can't get an additional TrendNet TEW-651 router set up in my
> home, either. [...]
Likely the same problem. Unless your ISP is providing you with a
block of IP addresses instead of the usual single address, you need to
connect one router, only. to your modem. Other devices must then be
connected to that router.
Why are you trying to connect multiple routers to a single modem?
Greater wireless coverage and/or general LAN expansion? If so, then you
may want to configure your additional routers as wireless access points,
rather than as full-function routers. That should leave you with a
single, extended LAN, where multiple devices can communicate with each
other and with the Internet. Details of how to do that configuration
may vary from one router model to another. On some Netgear models,
there's a one-step option to do it; on models without such an option,
there's a general procedure which should work:
https://community.netgear.com/t5/x/x/m-p/1463500
That's written for a Netgear C6300, but the steps are about the same for
any other router (any make/model) which lacks a one-step WAP option.
With descriptions like "an ASUS AC1900" or "an old Zonet or something",
I can't say much about the details. (I have done it with a TP-Link
TL-WDR3600, however.)Thank you so much for the response. This explains it.
So, my Comcast ISP provides only one IP address. I bought a new modem to replace the rental modem from Xfinity, which had a router in it and worked fine. I didn't realize that the system wouldn't work with the new modem because it had been connected to the router in the modem, not the modem itself. I hooked up the ethernet switch to the router and it works fine now. Thanks you for the explanation.
The reason I'm doing this is because we have two renters on our property that I trenched CAT 5 cable to so they can share our internet service. One renter is hooked up to DISH TV, which we share. The other renter has just a router.