I'm about to change from DSL to Cable

Discussion in 'Tomato Firmware' started by SM188, May 3, 2009.

  1. SM188

    SM188 Addicted to LI Member

    is there a setting I need to turn on with it like PPPoE on DSL modems? Cause that's how I'd like to keep it where the router is being used to keep my connection and not the modem.
  2. gawd0wns

    gawd0wns Network Guru Member

    When you get cable, you don't have to do anything. Your ISP will most likely authorize you access to the network/internet by the MAC address of your modem, I have never heard of any cable providers requiring a login.

    Under WAN internet type, under Basic settings, you will most likely have to select DHCP, or STATIC if you have a STATIC setup... Though I think DHCP should still work in this scenario.

    Cable is like cruise control, you don't have to do anything... except steer.
  3. FattysGoneWild

    FattysGoneWild LI Guru Member

    Yeah cable is extremely simple. Plug and play. I would suggest cloning the mac address since you will be moving to cable. Certainly not a have to. I have always done it myself though.
  4. gawd0wns

    gawd0wns Network Guru Member

    I'm just curious, why don't you want your cable modem to handle the connection? Unless your router has a spot to convert the cable signal, I don't see how it will be possible.

    I think everything concerning the actual DHCP negotiation is done at the router level and not the cable modem.
  5. bripab007

    bripab007 Network Guru Member

    Gawd0wns, your cable company does, indeed, hand out an IP address, either static or dynamic, to your router, via the cable modem acting as a bridge.

    You're confusing this with the DHCP that your router handles internall on your LAN.
  6. SM188

    SM188 Addicted to LI Member

    I want the router to handle the connection is because when I first had DSL hooked up. I had my router set on automatic DHCP (if I recall) and the signal would drop here and there. But once I switched it to PPPoE my signal hasn't dropped. I just want to avoid doing the power cycle garbage I went through
  7. humba

    humba Network Guru Member

    That's not something you have control over. A cable modem is a simple media bridge.. it converts the signal from the Coax cable to Ethernet. You then connect any Ethernet capable equipment to the Ethernet port of the cable modem (there are also modems that are USB based (mine even has both) but I'd recommend strongly against that.. and nowadays every computer has an Ethernet port anyway)..
    There's no such thing as keeping a connection alive... you're thinking of PPPoE where there's a layer above the physical one (the model always does the physical layer.. it never gets to tomato/any router/any device connected to the modem). If your DSL provider uses PPPoE that session on top of the physical layer can be terminated on the modem, or a router, or a PC. But, that's not the only way to do DSL either - there are DSL providers that use DHCP so there's no PPPoE session to terminate (things are just like Cable with DHCP). Other DSL providers provide you a static address that you need to plug into the end equipment (router, pc, whatever)... once again there are also cable providers that do it like that and once again there's no PPPoE connection to terminate anywhere.

    Bottom line, only when you have PPPoE (or PPTP.. there are a bunch of protocols but PPPoE is by far the most widely used one) is there a connection that you can terminate on an equipment of your choice. With cable, unless your cable provider uses a Telstra like System (change it in your router.. you'll see they do have authentication), there's no session to terminate and no credentials.. and if you want to cut the Internet link, there' no PPPoE session to tear down.. instead you need to deactivate the WAN port of your router, or disconnect the physical connection, unplug the cable modem, unplug the coax input to your cable modem, or activate the "No internet" mode some cable modems have (that's a button on the device that allows you to terminate any and all connectivity.. but you cannot do that remotely, somebody needs to press the button).

    Also, what you said about your DSL cannot quite be.. if the provider uses PPPoE, you would have to put the DSL modem into bridge mode.. just changing what the router does wouldn't be enough as the modem would still try to set up the connection. And I have yet to encounter a provider that would allow you to chose if you used DHCP or PPPoE.. not even sure that's technically possible. When your router uses DHCP and your modem is set up without bridging, the modem would terminate the PPPoE session and then you'd use DHCP on the LAN port of the modem.. so if you connect Tomato there, then it would do DHCP. But if you then want to terminate the PPPoE session no the router, there's no way around reconfiguring the modem.
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