subnet masks

Discussion in 'Linux Networking' started by bulk88, Mar 8, 2005.

  1. bulk88

    bulk88 Guest

    I am not a linux user, but I need help. I have 2 routers, a linksys
    HPNA router and my DSL modem with a built in router. I want to use the
    DSL modem as a router, and the linksys HPNA router as a bridge between
    ethernet and HPNA (it can), except the linksys router needs a IP
    address. My lan is currently using 192.168.1.*, and I have the
    linksys's lan side perminently set to 192.168.1.254, but I want to set
    it to 192.168.2.1 so I dont run into a chance of DHCP overlaping into
    that IP. If I set the linksys as 192.168.2.1, I can only access it if
    my comptuer's IP is 192.168.2.* but then my dsl modem doesnt give me
    internet access. All of these routers/modems are on the same physical
    ethernet network. I have a feeling this has something to do with subnet
    masks, so which subnet mask should I use for 192.168.1.* and
    192.168.2.* computers to talk?
     
    bulk88, Mar 8, 2005
    #1
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  2. I guess you need to check if your dsl modem/router is, or can be, set to a
    broader netmask than 255.255.255.0 on its LAN side (many are limited to
    253 clients). Otherwise (as you discovered) the modem/router will ignore
    any IPs outside of its 192.168.1.0/24 network. But even if the modem had
    a netmask 255.255.0.0, it could be that your 192.168.2.* client PCs do not
    have any route to the 192.168.1.* IP of the modem/router (if their
    netmask is 255.255.255.0).

    For example, a netmask 255.255.254.0 could cover an range between
    192.168.0.0 network IP and 192.168.1.255 broadcast.

    A netmask 255.255.252.0 could cover an range between 192.168.0.0 network
    IP and 192.168.3.255 broadcast.
     
    David Efflandt, Mar 8, 2005
    #2
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