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Cable Modem Access

Discussion in 'Tomato Firmware' started by asterger, Aug 19, 2008.

  1. asterger

    asterger Network Guru Member

    Hello,

    I am able to access my Thomson Cable Modem on 192.168.100.1 however my router is configured at 192.168.0.1. I have not added any reference MASQUERADE line to the default iptables.

    How am I able to access the cable modem on a different subnet?

    -- asterger
     
  2. mstombs

    mstombs Network Guru Member

    You only need a secondary IP address and the nat masquerade command when the modem only knows how to reply to a local IP address. The modem will be in the default route of router so requests get to the modem - the potential problem is the reply route. Even with a PPPOE bridge modem if the modem can have its default route set as the internal router you can avoid the NAT masquerade. In the case of the cable modem it has been configured to accept and reply to its local IP address on the LAN side.

    I once had a Terayon cable modem which needed a secondary IP address on the router (but no nat masquerade), I later had a newer cable modem that didn't need the IP address.
     

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