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CM500 No Internet on Ethernet
Hi, I just replaced an out of date Arris with the CM500. Took awhile just to get it to connect, but we finally got it. I have a 5 port switch coming off the one ethernet cable. I have one laptop on ...
> The modem only gets 1 public ip address. It assigns that to the router
> which then sets up private ip addresses.Not really. The modem does not get an external IP address from the
ISP. The (first?) gizmo which is connected to the modem would get that
external IP address from the ISP. The ISP grants that address to the
gizmo (typically a NAT router), not to the modem. The modem's only
involvement is as a conduit.> If you put the switch before the router, it gets that public ip
> address and not a private one.I wouldn't expect "a 5 port [unmanaged] switch" to get _any_ IP
address, but only one device (at a time) can get the one external
address from the ISP, and that's bad enough.> You need to go modem---->router--->switch
True-ish. Ethernet is bidirectional, so a more accurate
representation would be: ISP <--> modem <--> NAT router <--> switch
> The modem only gets 1 public ip address. It assigns that to the router
> which then sets up private ip addresses.
Not really. The modem does not get an external IP address from the
ISP. The (first?) gizmo which is connected to the modem would get that
external IP address from the ISP. The ISP grants that address to the
gizmo (typically a NAT router), not to the modem. The modem's only
involvement is as a conduit.
> If you put the switch before the router, it gets that public ip
> address and not a private one.
I wouldn't expect "a 5 port [unmanaged] switch" to get _any_ IP
address, but only one device (at a time) can get the one external
address from the ISP, and that's bad enough.
> You need to go modem---->router--->switch
True-ish. Ethernet is bidirectional, so a more accurate
representation would be: ISP <--> modem <--> NAT router <--> switch
Thanks guys. Makes perfect sense. I can live with it until I decide on something else more to my liking. I should have read more into it. Thanks to you both!
Regards,
Tom