Having supported and built cable modem systems for years (including them),
Cox Business will do modems a few ways, but usually provisioning at the
modem a limit quantity of mac/ip's (normally == 1) for what can pass, then
you just *use* them as you would normally, either grabbing dhcp (with a new
mac) or using statically assigning to the same public host as the main (ie
firewall/router). If you get a contiguous /29 or larger network
block/prefix from them or on your own, they'll usually give you a static ip
and route that /29 prefix *at* your primary ip, so traffic knows how to get
to you, then you just apply them with nat or however normally to the
interface. They can also do private mpls connectivity, but that's another
bag...
As David said, your modem is NOT a router, mostly a Layer 1-2 bridge with
some provisioned security features (DOCSIS BPI), unless it's one of their
combo boxes with router/wifi built-in, but those tend to suck and you don't
want to use those anyways. Any routing occurs at the Cox CMTS (cable modem
termination system, your cable gateway router), or your gateway
firewall/router.
-mb
On Sun, Jul 9, 2023 at 11:34 PM David Schwartz via PLUG-discuss <
plug-discuss@lists.phxlinux.org> wrote:
> Cable modems pull the signal from a coax line and turn it into an ethernet
> signal that comes out of a single RJ-45 plug.
>
> I dunno squat about what goes on inside of those boxes, but routers
> typically have a WAN port and a bunch of “internal” ports that are all
> RJ-45 plugs.
>
> If you can get Cox to send traffic for a group of IPs to your modem, then
> they should all come out the ethernet side as well, right?
>
> Remember that their modem is NOT a “router”. You can plug a router into
> it, tho.
>
> -David Schwartz
>
>
>
>
> On Jul 9, 2023, at 10:34 PM, Michael Butash via PLUG-discuss <
> plug-discuss@lists.phxlinux.org> wrote:
>
> On using openwrt on legacy routers, start here, find anything that is
> *well* supported and hunt on ebay, or go to a thrift shop and search this
> list if you find a decent looking box. At one point years ago I'd scooped
> up several decent goodwill routers for some $5-7ea and flashed to openwrt
> to give to family and friends when they complained about their crappy
> router and wifi not working. Probably still have one or two floating
> around...
>
> https://openwrt.org/toh/start
>
> -mb
>
>
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