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  • Cisco 3750 routing LAN to WAN fails

    Hi,,

    We have a cisco c3750 router with ip-services image (12.50)
    A cable modem maintains the fysical connection to ISP. so:

    internet -> modem /ethernet out -> cisco 3750, port 24. -> other switchports -> LAN-clients

    All ports are in default VLAN 1.
    port 23: windows 2003 server with dns/dhcp server.(192.168.10.100, default gateway 192.168.10.1 )
    port 22: PC with windows XP ( dhcp-client )
    vlan 1 : ip address 192.168.10.1 (default gateway )

    Goal: connecting PC/hosts in VLAN 1 to internet

    status:
    set ip routing,
    WAN port (fa1/0/24) configured as a router and succesfully connected to internet.
    I can reach any internet-addresse from the console.
    Also the PC gets an ip-address from the server. problem: routing from VLAN 1 to "internet/port 24" isn't working.

    What step should i take?
    tried default-router /default network /default gate-way stuff, nothing seems to work. According to the documentation it should work..

  • #2
    Re: Cisco 3750 routing LAN to WAN fails

    Not sure how your External IP (or WAN port) would look like but I think you have to do NAT.
    Marcel
    Technical Consultant
    Netherlands
    http://www.phetios.com
    http://blog.nessus.nl

    MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
    "No matter how secure, there is always the human factor."

    "Enjoy life today, tomorrow may never come."
    "If you're going through hell, keep going. ~Winston Churchill"

    Comment


    • #3
      Re: Cisco 3750 routing LAN to WAN fails

      Originally posted by ictbus View Post
      Hi,,

      We have a cisco c3750 router with ip-services image (12.50)
      A cable modem maintains the fysical connection to ISP. so:

      internet -> modem /ethernet out -> cisco 3750, port 24. -> other switchports -> LAN-clients

      All ports are in default VLAN 1.
      port 23: windows 2003 server with dns/dhcp server.(192.168.10.100, default gateway 192.168.10.1 )
      port 22: PC with windows XP ( dhcp-client )
      vlan 1 : ip address 192.168.10.1 (default gateway )

      Goal: connecting PC/hosts in VLAN 1 to internet

      status:
      set ip routing,
      WAN port (fa1/0/24) configured as a router and succesfully connected to internet.
      I can reach any internet-addresse from the console.
      Also the PC gets an ip-address from the server. problem: routing from VLAN 1 to "internet/port 24" isn't working.

      What step should i take?
      tried default-router /default network /default gate-way stuff, nothing seems to work. According to the documentation it should work..

      What VLAN is f0/24 in? Are all of your ports, including f0/24 in VLAN 1?

      Comment


      • #4
        Re: Cisco 3750 routing LAN to WAN fails

        Can you show us your config?
        CCNA, Network+

        Comment


        • #5
          Re: Cisco 3750 routing LAN to WAN fails

          sorry not necessary anymore. We found out this router doesn't support NAT. That's why we can't go to internet without an extra firewall/router.

          Comment

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