Re: smallest possible network, was Re: VOIP with a linksys PAP2

From: Kevin J. Cummings (cummings_at_kjchome.homeip.net)
Date: 06/17/05

  • Next message: David Cary Hart: "Re: News Reader?" 
    Date: Fri, 17 Jun 2005 15:19:25 -0400
To: THUFIR HAWAT <hawat.thufir@gmail.com>, For users of Fedora Core releases <fedora-list@redhat.com>

    THUFIR HAWAT wrote:
    > I've been reading the pdf manual (lost the paper version). err,when
    > all else fails read the manual? on page 4 there's a picture of the
    > wl-330g connected to a switch:
    >
    > "Device Installation
    >
    > Using DC power
    >
    > 1. Insert one end of the supplied RJ-45 cable to the WL-330g Ethernet
    > port.
    >
    > 2. Insert the other of the RJ-45 cable to a network hub, switch,
    > router or wall
    > patch Ethernet port.

    In this case, that would be your hub.

    > 3. Connect the power adapter plug to the WL-330g DC-IN socket.
    >
    > 4. Connect the WL-330g power adapter to a wall socket.

    OK, power on the wl-330g

    > 5. Connect the network hub, switch, or router power adapter plug to
    > the DC-IN socket of the device.
    >
    > 6. connect the network hub, switch, or router power adapter to a wall
    > socket."

    Then power up the hub

    > in the picture there's a third socket/hole/button/whatever on the far
    > right. I can't find any mention as to what this is.

    To the right of what?

    > also, I have a hub, not a switch.

    OK

    > and, on page 19 the manual states that
    >
    > "Device setup
    >
    > Using the device in a local network
    >
    > You can use the WL-330g to connect a WLAN-enabled computer to a local
    > network with
    > or without a DHCP server.
    >
    > To connect a WLAN-enabled computer to a local network:
    >
    > 1. Switch the WL-330g to AP mode. (Default SSID: AP xxxxx), then turn
    > on the
    > device.
    >
    > 2. Connect one end of the supplied RJ-45 cable to the Ethernet port of
    > the device
    > and the other end to the Ethernet port of the local network.
    >
    > 3.) Use the WLAN adapter software in the WLAN enabled computer to
    > perform a Site
    > Survey. Make sure the computer's WLAN adapter is set to Infrastructure
    > mode.
    >
    > 4.) Establish connection with the WL-330g.
    >
    > 5.) Set the IP configuration of the computer to establis connection to
    > the local
    > network. Verify you connection.

    You indicated that your computer (named arakis) can already successfully
    communicate with your wl-330g and the internet beyond. This is when it
    is plugged directly into eth0 on arakis. Does the connection *still*
    work when you plug the wl-330g into the hub instead (and plug eth0 into
    the hub as well)? This is with the PAP2 disconnected. Kinda like:

    internet ==> router
    route ==> wl-330g
    wl-330g ==> hub
    arakis eth0 ==> hub

    Now your hub really is the "hub" of your local network. If this works,
    it may be possible then plug your PAP2 into the hub and have *it* work
    as well. All without having to use arakis as a router.

    > Use the Wireless Setting Utility to change WL-330g SSID or encryption
    > settings."
    >
    >
    > so, I was wrong. the wl-330g is smarter than I, for whatever reason,
    > had thought. However, even this is, ultimately, the best set-up, I'm
    > going in a different direction. I want proof that the cables and hub
    > work. to that end, I just want some ftp, or whatever, between my two
    > computers.
    >
    > I've named my two computers arrakis and caladan.
    >
    > I've got:
    >
    > internet ==> router
    > router ==> wl-330g
    > wl-330g ==> eth0 of arrakis
    > eth1 of arrakis ==> hub
    > hub ==> eth0 of caladan
    >
    > now, I'll look in <http://www.tldp.org/> for info about this. here's
    > my sysctl.conf file:
    >
    > [thufir@localhost ~]$ cat /etc/sysctl.conf
    > # Kernel sysctl configuration file for Red Hat Linux
    > #
    > # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and
    > # sysctl.conf(5) for more details.
    >
    > # Controls IP packet forwarding
    > net.ipv4.ip_forward = 0
       ^^^^^^^^^^^^^^^^^^^^^^^

    > # Controls source route verification
    > net.ipv4.conf.default.rp_filter = 1
    >
    > # Do not accept source routing
    > net.ipv4.conf.default.accept_source_route = 0
    >
    > # Controls the System Request debugging functionality of the kernel
    > kernel.sysrq = 0
    >
    > # Controls whether core dumps will append the PID to the core filename.
    > # Useful for debugging multi-threaded applications.
    > kernel.core_uses_pid = 1
    >
    >
    > # Controls IP packet forwarding
    > net.ipv4.ip_forward = 1
       ^^^^^^^^^^^^^^^^^^^^^^^

    Notice that you set this twice, once to 0, and a second time to 1. Try
    removing (or commenting out the set to 0)

    > [thufir@localhost ~]$
    >
    > I'll start with the basics. do I want a Virtual Private Network?
    > <http://www.tldp.org/HOWTO/VPN-HOWTO/x192.html>

    VPN is for making your home network be a part of a remote network while
    using the internet as a connection method. It encapuslates and encrypts
    the traffic between the two networks so that the data remains secure
    while it transits the internet. Its usful in an environment when one
    wants to work from home without jeopardizing the security of your
    employer's networks/data. I would say NO, you do want want to worry
    about VPN right now.

    > I just want transfer a small file between the computers as a test.

    Ignore the internet connection for now (unplug eth0 is you want to) and
    concentrate on the following network connections:

    arakis eth1 <==> hub <==> caladon eth0

    If you've plugged in the cables right, you should see "link" lights on
    your hub light up for each connection (yes?).

    use system-config-network to configure each ethernet card. create a
    private network between the two, for example, choose a private class C
    network like: 192.168.10.0 with a NETMASK of 255.255.255.0 and a
    BROADCAST mask of 192.168.10.255. Assign address 192.168.10.1 to
    arakis, and 192.168.10.2 to caladon. After both computers are
    configured, make sure that both interfaces are ACTIVE. Once they are
    active, you should be able to see the results with:

    ifconfig eth1 on arakis
    ifconfig eth0 on caladon

    You should then see routes in your routing table on arakis similar to:

    > route
    > Kernel IP routing table
    > Destination Gateway Genmask Flags Metric Ref Use Iface
    > 192.168.10.0 * 255.255.255.0 U 0 0 0 eth1

    and on caledon:

    > route
    > Kernel IP routing table
    > Destination Gateway Genmask Flags Metric Ref Use Iface
    > 192.168.10.0 * 255.255.255.0 U 0 0 0 eth0
    > default 192.168.10.0 0.0.0.0 UG 0 0 0 eth0

    (the default route on caledon is unimportant for this test since we
    won't be sending any packets beyond the local network, but may be
    important and possibly even change in the final configuration depending
    on your final network topology)

    If it works, you can:

    ping 192.168.10.2 on arakis

    and

    ping 192.168.10.1 on caladon

    and see the output of the packet timings on your screens.

    Can you get this far? Is this clear enough for you? 

    -- 
Kevin J. Cummings
kjchome@rcn.com
cummings@kjchome.homeip.net
cummings@kjc386.framingham.ma.us
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