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Connecting Cisco 871 to Digiweb link

  • 17-12-2008 07:45PM
    #1
    andycool
    Closed Accounts Posts: 13 ✭


    Hi
    I am looking to connect our 871 to our Digiweb 6mb up/down Cambridge equipment link.

    I have been playing around with the config and still have not managed to get a link live.

    Does anyone have a suggested config to get this working please?

    Thanks

    Andy


Comments

  • #2
    Alun
    Registered Users, Registered Users 2, Paid Member Posts: 21,529 ✭✭✭✭Alun


    What is this "Digiweb 6mb up/down Cambridge equipment link" exactly? I'm assuming it's a (wireless) modem of some sort?

    Post up what you have already and I can see if there's anything obvious you're missing.


  • #3
    Ruaidhri
    Closed Accounts Posts: 1,719 ✭✭✭Ruaidhri


    andycool wrote: »
    Hi
    I am looking to connect our 871 to our Digiweb 6mb up/down Cambridge equipment link.

    I have been playing around with the config and still have not managed to get a link live.

    Does anyone have a suggested config to get this working please?

    Thanks

    Andy

    Hi Andy,

    First off, can you let us know what you're trying to do ie: NAT all your LAN connections behind the Router, and get the routers IP address from your ISP (via PPP/PPPoE)

    Next, can you get the outputs from:

    'sh ver' <-- to see what code you're running
    'sh run' <--- so we can see what's on the router
    'sh ip int brie' <-- so we know what state interfaces are in
    'sh atm pvc' <-- to determine if the DSL later is up (ie the ATM PVC)
    'sh pppoe se all' <-- to determine if we have PPPoE connectivity

    Regards,
    Ruairi


  • #4
    Alun
    Registered Users, Registered Users 2, Paid Member Posts: 21,529 ✭✭✭✭Alun


    Ruaidhri wrote: »
    'sh ver' <-- to see what code you're running
    'sh run' <--- so we can see what's on the router
    'sh ip int brie' <-- so we know what state interfaces are in
    'sh atm pvc' <-- to determine if the DSL later is up (ie the ATM PVC)
    'sh pppoe se all' <-- to determine if we have PPPoE connectivity

    It's an 871, it doesn't have a DSL interface just an Ethernet WAN interface for connecting to a separate cable/DSL modem (it's the 877 that has the DSL modem built-in). We first need to find out what this modem is exactly (possibly a Digiweb wireless modem) and what interface it's expecting. I seem to remember those modems don't do PPPoE at all and it's just a straight connection with whatever connects to it getting it's IP configuration via DHCP. So we don't probably need to deal with PPPoE, or Dialers or anything like that, just either a straight routing configuration if it's a plain 871 or if it's an 871W then an IRB setup to bridge the Ethernet and wireless connections together which is what I have on my 877W.


  • #5
    Ruaidhri
    Closed Accounts Posts: 1,719 ✭✭✭Ruaidhri


    No need to get narky when someone's trying to help ;)

    If it's plain IP routing, just create two vlans, assign your interfaces to them (ie: Fa4 -> vlan2. the rest in vlan1), enable 'ip routing'.

    But I guess you'll need to configure the DSL modem upstream to have a route back to vlan1, so maybe NAT is your best approach.

    You can check if the modem supports PPPoE(oE) by enabling the pppoe-client on your interface, and doing pppoe debugs (you'll see the service offering if it does support it)

    /Ruairi


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