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Question About Linksys WRT54G

Discussion in 'Cisco/Linksys Wireless Routers' started by Rev. Michael L. Burns, Oct 22, 2007.

  1. Rev. Michael L. Burns

    Rev. Michael L. Burns LI Guru Member

    I have been trying to get Microsoft's Remote Assistance program to work. I first tried to get it to work between my notebook (wireless connection) and my desktop which was connected by cable to the router. I could not get a connection in either direction.

    I then connected my notebook to the router by cable and turned off the wireless. Still could not get it to work. I disabled the firewall on both systems to no avail.

    After re-enabling the firewalls, I unchecked the 'Filter Internet NAT Redirection' under the security tab in the router setup. I can now use Remote Assistance from either system regardless whether I am connected by cable or wireless.

    What exactly is this doing? Am I throwing open the gates to attacks through the router by doing this? Is there a better way? Any suggestions.

  2. mstombs

    mstombs Network Guru Member

    The Author of Tomato firmware, changed the name and sense of this switch to "NAT Loopback", which better describes its function.

    When the filter is on, attempts to connect to the WAN IP (held by the router) from within the LAN are blocked.

    When the filter is off, it is possible to test port forwarding rules on your router by trying to connect to the ISP WAN IP from a machine within the LAN. If you have no port-forwarding rules attempting to connect to a web server on the WAN IP address gets you to the router management screen - which is probably why there is a switch.

    I see no particular security concern, as this is a lan-side function.

    No idea why it solves your problem - but enabling the filter is known to sometimes break auto issuing of IP addresses by dhcp, for example.

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