Cisco NAT Question

Discussion in 'Cisco' started by rstevens@cstechsol.com, Jul 25, 2007.

  1. Guest

    Hey all,

    This one has me a little stumped, I have two Cisco routers
    configured as below: I have all of the correct NAT command and NAT is
    working fine for Router A, but anything coming from Router B
    192.168.3.x is not getting NAT'd. I made sure that I have access-list
    1 permit 192.168.3.0 0.0.0.255 as I do for 192.168.1.0 in order to
    process NAT.

    Any ideas why Router B can not NAT out Router A?

    Router A

    Ethernet 1 192.168.1.1 255.255.255.0
    nat inside
    Serial 0
    nat outside

    Router B
    Ethernet 1 192.168.1.254 255.255.255.0

    Ethernet 2 192.168.3.1 255.255.255.0
    , Jul 25, 2007
    #1
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  2. Al Guest

    On Jul 25, 8:22 pm, wrote:
    > Hey all,
    >
    > This one has me a little stumped, I have two Cisco routers
    > configured as below: I have all of the correct NAT command and NAT is
    > working fine for Router A, but anything coming from Router B
    > 192.168.3.x is not getting NAT'd. I made sure that I have access-list
    > 1 permit 192.168.3.0 0.0.0.255 as I do for 192.168.1.0 in order to
    > process NAT.
    >
    > Any ideas why Router B can not NAT out Router A?
    >
    > Router A
    >
    > Ethernet 1 192.168.1.1 255.255.255.0
    > nat inside
    > Serial 0
    > nat outside
    >
    > Router B
    > Ethernet 1 192.168.1.254 255.255.255.0
    >
    > Ethernet 2 192.168.3.1 255.255.255.0


    Kinda hard to say without seeing a bit more of the configs - can you
    post full (sanitised if necessary) configs for routers A & B?
    Having said that,...

    I'd be looking at ACLs and routing first of all. Can you ping
    192.168.1.1 from 192.168.3.1 for example?
    What do you see if you do a debug on router A for NAT?
    Can you consider NAT on router B to overload 192.168.3.0/24 onto
    192.168.1.254?
    Al, Jul 25, 2007
    #2
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