Router configuration --- help

Discussion in 'Cisco' started by Benson, Sep 10, 2004.

  1. Benson

    Benson Guest

    Hi,
    I want to set up a internetworking environment:

    The Network Topology:

    Internet ----R1 ---LAN1---R2----IPLC----R3----LAN2


    1. 3 routers: R1, R2, R3
    2. R1 = ADSL Router, the LAN IP = 202.27.9.16/28
    IP = 202.27.9.16/28
    Default = 202.27.9.17
    DNS = 202.27.9.19
    3. R2 = IPLC Router, LAN IP = 202.27.9.18; WAN IP = 192.168.1.253/24
    4. R3 = IPLC Router, WAN IP = 192.168.1.254/24, LAN IP = ??

    How can I configure the R2 & R3, so that I can use the LAN1 IP Address
    from the LAN2 ?

    Thank you so much
     
    Benson, Sep 10, 2004
    #1
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  2. In article <>,
    (Benson) wrote:

    > Hi,
    > I want to set up a internetworking environment:
    >
    > The Network Topology:
    >
    > Internet ----R1 ---LAN1---R2----IPLC----R3----LAN2
    >
    >
    > 1. 3 routers: R1, R2, R3
    > 2. R1 = ADSL Router, the LAN IP = 202.27.9.16/28
    > IP = 202.27.9.16/28
    > Default = 202.27.9.17
    > DNS = 202.27.9.19
    > 3. R2 = IPLC Router, LAN IP = 202.27.9.18; WAN IP = 192.168.1.253/24
    > 4. R3 = IPLC Router, WAN IP = 192.168.1.254/24, LAN IP = ??
    >
    > How can I configure the R2 & R3, so that I can use the LAN1 IP Address
    > from the LAN2 ?


    One way would be to subnet your address block. Use 202.27.9.16/29 on
    LAN1, and 202.27.9.24/29 on LAN2. However, this would limit you to 4
    client IPs on LAN1 and 5 client IPs on LAN2.

    You could configure bridging over the IPLC, so that LAN1 and LAN2 would
    be considered to be a single network.

    You could use private IPs on LAN2 and configure NAT on R3 to translate
    some LAN1 addresses to these IPs.

    --
    Barry Margolin,
    Arlington, MA
    *** PLEASE post questions in newsgroups, not directly to me ***
     
    Barry Margolin, Sep 10, 2004
    #2
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  3. Benson

    Benson Guest

    Hi, Barry,

    Thank you for your help.

    But since IP addresses are assigned by ISP, I do not want to lose any
    one of them, how can I configure the R2 & R3 to be a bridge, so that I
    can use the LAN1 IP addresses from LAN2 ?

    Thank you



    Barry Margolin <> wrote in message news:<>...
    > In article <>,
    > (Benson) wrote:
    >
    > > Hi,
    > > I want to set up a internetworking environment:
    > >
    > > The Network Topology:
    > >
    > > Internet ----R1 ---LAN1---R2----IPLC----R3----LAN2
    > >
    > >
    > > 1. 3 routers: R1, R2, R3
    > > 2. R1 = ADSL Router, the LAN IP = 202.27.9.16/28
    > > IP = 202.27.9.16/28
    > > Default = 202.27.9.17
    > > DNS = 202.27.9.19
    > > 3. R2 = IPLC Router, LAN IP = 202.27.9.18; WAN IP = 192.168.1.253/24
    > > 4. R3 = IPLC Router, WAN IP = 192.168.1.254/24, LAN IP = ??
    > >
    > > How can I configure the R2 & R3, so that I can use the LAN1 IP Address
    > > from the LAN2 ?

    >
    > One way would be to subnet your address block. Use 202.27.9.16/29 on
    > LAN1, and 202.27.9.24/29 on LAN2. However, this would limit you to 4
    > client IPs on LAN1 and 5 client IPs on LAN2.
    >
    > You could configure bridging over the IPLC, so that LAN1 and LAN2 would
    > be considered to be a single network.
    >
    > You could use private IPs on LAN2 and configure NAT on R3 to translate
    > some LAN1 addresses to these IPs.
     
    Benson, Sep 10, 2004
    #3
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