Originally Posted by mlah384
I've been trying to read through the many pages of this thread, but am unable to find the answer to "what is bridge mode and what's the benefit?"
Xfinity is now pushing a "gateway
", a combination of cable modem
and wireless router
, to their customers in areas where they are supported. The new box handles phone as well as Internet, and, if I am not mistaken, implements native dual stack (IPv4 and IPv6). So the one box will handle up to two phone lines (if one has phone service through Comcast), as well as up to four Ethernet lines (10/100Mbps and 1Gbps) and a limited number of wireless devices if one has Internet services through Comcast (Xfinity).
That will be fine for Internet customers like me who have just a few Internet devices and they are near where the gateway will be located, and will use either WiFi (wireless) or Ethernet (wired) connection to the router to give those devices access to the Internet. And by doing that, we don't have to understand how Comcast had decided to implement dual native stack for IPv4 and IPv6 and yet benefit from having both of these Internet Protocols available.
Some customers, however, have more demanding needs or want to access the WiFi from a longer distance or have more walls between their devices and the gateway, so they have their own routers for better WiFi signal strength, more ports, or other features, or even wanting to remain in control of as much of the customer's LAN as possible. But attaching a router to a router can be problematic. The answer is to set the router part of the gateway into "bridge mode" so it no longer acts as a router, but instead "bridges" an Ethernet port to the modem part, so the customer's router handles DHCP services, NAT for IPv4, etc., instead of having the gateway do all this.
"Bridge mode" affects only the Internet part of the gateway; it does not affect the phone part of the gateway.
As far as I am aware, a customer can still buy a supported modem and a router and should be able to save on rental fees, but it means having to do the configuration oneself (or paying for such a setup) but should save money over the long run. In this case, "bridge mode" is meaningless since the customer would be attaching a router to a modem, not attaching a router to a "gateway" that has both modem and router circuitry in the same box.
I have been following this thread in part because I had received an upgrade notice that the modem I am renting has to be upgraded to handle newer services, the current modem being DOCSIS 2.0 (instead of DOCSIS 3.0) and my current router having no clue on what IPv6 is, so renting a box that doesn't have the limitation of my old equipment has a certain amount of appeal.
Note: none of this affects TV service. Where I am, analog (NTSC) cable service is long dead (having been removed between midnight and 6am on October 9, 2012), and the last time I checked most of the QAM (digital cable TV) channels are scrambled (encrypted). The removal of analog cable TV channels freed up bandwidth on the cable to allow either more digital TV channels or to allow increased modem bandwidth (or both) or other services (e.g., phone, home monitoring).
Technically, this thread is about Xfinity's X1 services, which is TV services and doesn't deal with the Internet services (other than both TV and Internet are coming from the same company through the same coax). And currently I am not using their X1 services, but instead just being on their "Digital Starter Package" and renting one of their HD DVRs as the set-top box (which, in my case, is in a shelf under
the TV, even though it is still called a set-top