NAT - another problem?

Discussion in 'Cisco' started by =?iso-8859-15?Q?=F8ystein?=, Apr 9, 2005.

  1. Got problems with my network (Cisco 805 Routers)

    I got 3 site with four machines each:

    All the machines on the sites has the same IP addresses. This is something
    that I am not allowed to change.

    Machine 1 : IP 20.0.1.24
    Machine 2 : IP 20.0.1.25
    Machine 3 : IP 20.0.1.10

    I have alos a fourth site that should be able to access all the 9
    machines. The problems is that they use the same IP addresses.

    My solution is to use static NAT:

    Site 1:
    ip nat inside source static 20.0.1.10 10.0.1.10
    ip nat inside source static 20.0.1.24 10.0.1.14
    ip nat inside source static 20.0.1.25 10.0.1.15
    Router LAN IP 20.0.1.1 ip nat inside
    Router WAN IP 10.0.1.1 ip nat outside
    Site 2:
    ip nat inside source static 20.0.1.10 10.0.1.20
    ip nat inside source static 20.0.1.24 10.0.1.24
    ip nat inside source static 20.0.1.25 10.0.1.25
    Router LAN IP 20.0.1.1 ip nat inside
    Router WAN IP 10.0.1.3 ip nat outside
    Site 3:
    ip nat inside source static 20.0.1.10 10.0.1.30
    ip nat inside source static 20.0.1.24 10.0.1.34
    ip nat inside source static 20.0.1.25 10.0.1.35
    Router LAN IP 20.0.1.1 ip nat inside
    Router WAN IP 10.0.1.4 ip nat outside

    On site 4 my routing table looks like this:

    I do know that some classless subnetting would be better for the size of
    my routing table...
    ip route 10.0.1.10 255.255.255.255 10.0.1.1
    ip route 10.0.1.14 255.255.255.255 10.0.1.1
    ip route 10.0.1.15 255.255.255.255 10.0.1.1
    ip route 10.0.1.20 255.255.255.255 10.0.1.3
    ip route 10.0.1.24 255.255.255.255 10.0.1.3
    ip route 10.0.1.25 255.255.255.255 10.0.1.3
    ip route 10.0.1.30 255.255.255.255 10.0.1.4
    ip route 10.0.1.34 255.255.255.255 10.0.1.4
    ip route 10.0.1.35 255.255.255.255 10.0.1.4

    All my routers is available to ping all the machines in the network. My
    PROBLEM is that the clients on the LAN are not able to reach other clients
    on different sites. All clients has 20.0.1.1 as default router.

    Is my NAT configures correctly?
    Am I allowed to use the IP address I use? This is a totally private
    network and is not connected to the Internet.

    Regards Frengky

    --
    Sendt med M2 - Operas revolusjonerende e-postprogram:
    http://www.opera.com/m2/
    =?iso-8859-15?Q?=F8ystein?=, Apr 9, 2005
    #1
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  2. =?iso-8859-15?Q?=F8ystein?=

    rave Guest

    >From the config snippets you have attached the NAT seems right to em
    however if you can paste the entire config I can tell you more.
    rave, Apr 9, 2005
    #2
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