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CM500 and CM600 public or private IP address assigned to router?
I would like to use my router's port forwarding capability to remotely access devices on my LAN such as IP cameras. I know that with an integrated modem/router this can be done - I have it working now...
If you are on Time-warner network, they should assign you a public IP and for e.g. if you connect CM500 Cable modem with a R7000 Router, thr router will get Public IP and you will not have double NAT situation.
I didnt know which ISP you had service with. some ISPs in asia provide private IPs to the users and it will create double NAT situation.
I have not seen any ISP so far in US providing Private IPs but I have only worked with Comcasts and Time Warners. Not sure of smaller players.
1- Do the CM500/600 modems have the ability to assign the public IP address to a router?
-- All the Cable modem I know allow public IP,
actually it gives whatever IP that is assigned by the ISP. the modem just acts as a bridge. If comcast want to assign a public, modem will give public to the Router (I know comcast does)
2- will port forwarding still work when a router has been assigned a private IP address? I'm not a networking expert, but conceptually does the modem convert public IP+port x to private IP + port x?
-- Nopes, if your ISP (I dont know which), does not have public, Port fwd is not useful. you can still use some applications such as teamviewer.
3 - when a router is configured to send the WAN IP address to a dynamic DNS service does it send it's assigned private IP address or does it have the ability to determine the public IP address and send it?
-- This is tricky. I need to check how this is handled in double NAT situation.
Thanks for the response vkdelta.
My ISP is Time Warner. I am sure they assign a public IP. Today I use a modem/router combo and the config/status pages show a public IP address is assigned.
So based on your resoponse that a modem-only device will act as a bridge, I am pretty sure that that getting rid of my modem/router combo and moving to a separate modem and router will result in the router being assigned the public IP and port forwarding working.
You mentioned double NAT is tricky, I understand that, but I don't see that a double NAT would happen -- does the modem perform a NAT function? I assume that it doesn't.
If you are on Time-warner network, they should assign you a public IP and for e.g. if you connect CM500 Cable modem with a R7000 Router, thr router will get Public IP and you will not have double NAT situation.
I didnt know which ISP you had service with. some ISPs in asia provide private IPs to the users and it will create double NAT situation.
I have not seen any ISP so far in US providing Private IPs but I have only worked with Comcasts and Time Warners. Not sure of smaller players.