static route, next hop vs interface question.

Discussion in 'Cisco' started by cozzmo1@hotmail.com, Jan 15, 2006.

  1. Guest

    I put in a static route
    ip route 172.20.21.50 255.255.255.240 ethernet 0
    I saw the trace go to the next hop, but no further.
    after changing from the outbound interface to the next hop routers
    interface IP,
    ip route 172.20.21.50 255.255.255.240 142.1.11.45
    I had no problem reaching the destination.
    Does anyone know why?

    Thanks
    crzzy1
     
    , Jan 15, 2006
    #1
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  2. In article <>,
    <> wrote:
    >I put in a static route
    >ip route 172.20.21.50 255.255.255.240 ethernet 0
    >I saw the trace go to the next hop, but no further.
    >after changing from the outbound interface to the next hop routers
    >interface IP,
    >ip route 172.20.21.50 255.255.255.240 142.1.11.45
    >I had no problem reaching the destination.
    >Does anyone know why?


    proxy arp.
     
    Walter Roberson, Jan 15, 2006
    #2
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  3. Guest

    I put in a static route
    ip route 172.20.21.50 255.255.255.240 ethernet 0
    I saw the trace go to the next hop, but no further.
    after changing from the outbound interface to the next hop routers
    interface IP,
    ip route 172.20.21.50 255.255.255.240 142.1.11.45
    I had no problem reaching the destination.
    Does anyone know why?

    Thanks
    crzzy1

    correction to the above this is what I used to reach my destination
    (172.20.21.50)
    ip route 172.20.21.32 255.255.255.240 e0 (Doesn't work)
    ip route 172.20.21.32 255.255.255.240 142.1.11.45 (works)
     
    , Jan 15, 2006
    #3
  4. In article <>,
    <> wrote:
    >correction to the above this is what I used to reach my destination
    >(172.20.21.50)
    >ip route 172.20.21.32 255.255.255.240 e0 (Doesn't work)
    >ip route 172.20.21.32 255.255.255.240 142.1.11.45 (works)


    As I said... proxy arp. When you set an explicit next hop, your
    router is going to arp for that next hop, and that device will
    answer conveying back its MAC address. When you set the next
    hop as your current interface, then your router is going to ARP for
    the IP of the destination that is in the packet, and unless the
    remote router knows that it is to answer for -all- unknown IP
    address ranges (i.e, "proxy arp") then that router isn't going to answer
    (and nothing local will either because it isn't the IP address
    of anything local...)
     
    Walter Roberson, Jan 15, 2006
    #4
  5. Guest

    I looked it up.
    You are correct, the next hop is a foundry router, and the proxy arp is
    disabled by default.
    Nice work...
    Thanks,
    crzzy1
     
    , Jan 16, 2006
    #5
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