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Can Get On Network But Cannot Get On Internet

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  • Can Get On Network But Cannot Get On Internet

    I am trying to put in a new T1 with two 1841 routers. Here is the setup:

    RouterA
    FE 0/0
    IP address 172.16.1.10 255.255.255.0
    no shutdown

    S0/0
    IP address 172.16.250.1 255.255.255.252
    encapsulation HDLC
    no shutdown


    RouterB
    FE 0/0
    IP address 172.16.12.1 255.255.255.0
    no shutdown

    S0/0
    IP address 172.16.250.2 255.255.255.252
    encapsulation HDLC
    no shutdown

    PC
    IP Address: 172.16.12.4 255.255.255.0
    default gateway 172.16.12.1

    RouterA is attached to our network (172.16.1.0)
    When I'm on the PC (attached to RouterB via FE0/0) I can ping the entire network but cannot ping our firewall (172.16.1.254) which gets us out to the Internet.

    I set up EIGRP and also static routes
    Here are the static routes set up:

    RouterA
    ip route#0.0.0.0 0.0.0.0 172.16.1.254

    RouterB
    ip route##0.0.0.0 0.0.0.0 172.16.250.1

    Also, I cannot ping from RouterA Serial0 to 172.16.1.254 (firewall)
    Does anyone have any idea how I can get on the Internet?

    Thank you

  • #2
    Re: Can Get On Network But Cannot Get On Internet

    sorry if I'm don't get what ur saying, but I'm a little bit confused, I'm trying to imagine how your network topology looks like.
    ur using same subnet for the clients and the firewall? yet the firewall connects u to the internet?

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    • #3
      Re: Can Get On Network But Cannot Get On Internet

      Try adding a clock rate to one of the routers on the WAN interface.
      MCITP:SA, MCSA 2003, MCP, CCNA, A+, Net+, Security+

      Comment


      • #4
        Re: Can Get On Network But Cannot Get On Internet

        Are you able to ping the FE on router A (172.16.1.10)? I am guessing you can by the comment you "can ping the entire network". Also are you learning routes via EIGRP on the firewall? Make sure there is a route back if you are using static routing on the firewall. Are you able to post the routing table from the firewall and also check to make sure it is set to respond to ICMP? Are you able to ping out to the internet from the firewall?

        Also if the firewall is how you are connected to the internet and this is via a T1, does the firewall have a CSU/DSU?


        The clock source on a cisco by default should be line, most likely the ISP is going to be set to internal so you should be set to line or external. This can be checked by looking at the service module or controller. If you are set incorrectly then you will see some slips and errored sec, which will also create some CRC and Frame errors which you would see on the show interface xxxxx command. If you have any questions about the clocking I would contact your provider.
        Last edited by mnbc; 16th August 2008, 21:18. Reason: Adding additional info

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