Are either of these a security risk?

Discussion in 'Networking Issues' started by Bird333, May 25, 2007.

  1. Bird333

    Bird333 Network Guru Member

    In the first scenario, I am creating another interface on the WAN port to bridge to my lan to have DHCP give wired clients ip addresses. This is with a La Fonera device connected to a switch and the dsl modem and other computers connected to the same switch. Here are the steps taken:

    1. Establish PPPoE internet connection (this may take a few minutes before a solid connection is made)

    2. SSH into the router

    3. I typed this command

    ifconfig eth0:2 netmask up

    4. Then I added this interface to the br0 bridge where ath0 is with this command

    brctl addif br0 eth0:2
    (when you type 'brctl show' it shows the interface as eth0 instead of eth0:2)

    The next scenario involves adding an ip address to the WAN interface in the same subnet as the dsl modem default address to be able to access the modem interface through the router. This is described on this webpage:

    Can someone tell me definatively whether either of these cause a security risk? Can you explain exactly how/why it is a risk and what commands need to be issued to get rid of the risk (if there is one) and still have the above functionality?

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