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cisco 857w and internal ftp server problem

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  • cisco 857w and internal ftp server problem

    i have a pc with windows 2003 server enterprise edition and I have put cerverus ftp server in order to I have access from outside to inside.my router is cisco 857w and cannot find the wrong setup.i open the port 20 and 21 tcp and i have no firewall.
    can anyone help me???sorry for my bad english iam from greece.

  • #2
    Re: cisco 857w and internal ftp server problem

    Have you configured a proper static NAT?

    For a quick reference, take a look here:
    http://blogs.techrepublic.com.com/ne...tag=rbxccnbtr1
    Regards,
    Csaba Papp
    MCSA+messaging, MCSE, CCNA
    ...............................
    Remember to give credit where credit is due and leave reputation points where appropriate
    .................................

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    • #3
      Re: cisco 857w and internal ftp server problem

      i have create a static nat.this is my config.check please......
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      • #4
        Re: cisco 857w and internal ftp server problem

        Netstorm,

        Configure your FTP server to run Passive FTP. Then the only nat statement you should need it the following:

        ip nat inside source static tcp 10.10.10.6 21 interface Dialer0 21

        The reason for this is because active ftp connections client connects on port 21 and then the server initiates a connection from port 20 to a port above 1024 for the client side. Most firewalls today block active ftp connections do to security risks due to the fact that you have an external host (i.e. ftp server) trying to initiate a connection to a trusted host (i.e. host behind other firewall). If your FTP server software supports Passive FTP connections then the above NAT statement should work.

        Ryan

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