linksys router with different subnet

Discussion in 'Cisco' started by Patriot, Nov 1, 2003.

  1. Patriot

    Patriot Guest

    Can someone please shed some light. I have a cable modem with two linksys
    routers, one is a 4 port linksys/VPN router and the other is a 8 port. I
    want to link and configure them with a different subnet. For example, the 4
    port will use and the 8 port with How can I configure them correctly and still access the
    internet from both.

    Thank you very much
    Patriot, Nov 1, 2003
    1. Advertisements

  2. Patriot

    Kevin© Guest

    A tad off topic for a Cisco group but here goes .. ;-) This sounds like an
    exam question.

    4 Port Linksys = L4
    8 Port Linksys = L8
    Cable Modem = CM

    Cable modem will NOT give out more then one DHCP assigned address from your
    You know the DNS's given out by your ISP.
    You have enough cross over cables, etc.
    Here's how I would configure them.

    CM -> L4 -> L8.

    * CM connected to L4's WAN port.

    * L4 (port 1) is connected to WAN port on L8
    * L4 LAN address is,
    * L4's DHCP server set for
    * Set L4's DNS to ISPs.
    * Leave PCs you want to VPN into on L4's LAN.

    * L8's WAN port is set for STATIC IP and set to
    * L8's Default gateway is
    * L8's LAN address is
    * L8's DHCP server set for
    * Set L8's DNS to ISPs.
    Kevin©, Nov 2, 2003
    1. Advertisements

  3. Patriot

    Patriot Guest

    I truely appreciate your help. I will try it. Again thank you very much
    Patriot, Nov 2, 2003
  4. Patriot

    Patriot Guest

    why the PC connected to L8 is pointing to default gateway
    instead of In the L8 router I change the default gatway to but every time I renew and release the pc that I connect in one
    of the port in L8, it keeps pointing to Shouldn't it be
    pointing to the L4 gatway

    Thanks in advance
    Patriot, Nov 2, 2003
  5. Patriot

    Patriot Guest

    What I am doing wrong. I can ping the default gateway in L4 from
    any computer that is connected to L8 but I can't ping the DG in
    L8 from L4 router.

    Any help will be greatly appreciated

    Patriot, Nov 2, 2003
  6. Patriot

    Kevin© Guest


    L8 devices can PING anything inside 192.168.1.x, good. Can L8 and L4 PCs
    reach the Internet?

    Since the PCs on the L8's LAN know their default gateway which,
    L8 forwards the packets onto L4s network. All is well for them outbound.
    Your now having issues inbound to L8's LAN.

    These Linksys devices are pretty simple. They probably don't have a section
    for adding custom routes or even do ICMP redirection. As a result L4's LAN
    PCs don't know anything about the 192.168.2.x segment, they simply see
    traffic looking like it's coming from (NAT'ed PCs in

    On the L8 can you switch off NAT and only have it route? I'll be buying
    one of these soon, once I sell my old SMC. I'm not that familiar with the
    LinkSys in terms of setting up STATIC NATs (making say NAT to, for example.). But you 'may' need to STATIC NAT each PC on
    L8 in order for them to be seen properly by L4 PCs.

    I'm assuming Microsoft PCs here. One thing you can try is on a PC in
    192.168.1.x add a manual route towards 192.168.2.x. You'll need to go into
    the PC and add a route adjustment from a command prompt.

    route add mask

    This tells the L4 PC that to reach the 192.168.2.x network, they need to
    talk to (L8's WAN port). The question is will L8 allow them
    in? It things 192.168.1.x as untrusted on the WAN interface.

    What you may need to consider if this gets too complicated or isn't adequate
    for your needs, this may not even work right, is to pick up a cheap 8 port
    switch and hang it off one of L4's LAN ports.
    Kevin©, Nov 2, 2003
  7. Patriot

    Kevin© Guest

    Sorry missed this.

    L8 is the router for L8's PCs. He's the default gateway for L8's PCs.
    They have to have as their gateway.

    He'll forward or route the traffic from L8's PC's out his WAN port onto his
    default gateway which is L4, or L4 then sends it to the
    Kevin©, Nov 2, 2003
  8. Patriot

    Patriot Guest

    Thanks a lot. Yes I can get in to the internet with any port from both L4
    and L8. I will try the second solution for the pinging and let you know.

    Thanks for all your help
    Patriot, Nov 2, 2003
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.