Baffled by a Cable Modem

Tue Jun 16 23:14:27 UTC 2009

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    Message: 4
    Date: Tue, 16 Jun 2009 12:16:46 -0600
    From: Frank Cox <theatre at sasktel.net>
    Subject: Re: Baffled by a Cable Modem
    To: dnvot at yahoo.com, "=?ISO-8859-1?Q? Community_assistance,
        _encouragement, ?=     and advice for using Fedora.  "
        <fedora-list at redhat.com>
    Cc: dnvot at yahoo.com
    Message-ID: <20090616121646.2b392da2.theatre at sasktel.net>
    Content-Type: text/plain; charset=ISO-8859-1

    On Tue, 16 Jun 2009 10:50:01 -0700 (PDT)
    dnvot at yahoo.com wrote:

    >  Can anyone give me a clew on where to start?

   > Do you have this modem hooked up with USB or ethernet?

    It is hooked to an ethernet port on my motherboard (sis190)

   > What is the content of /etc/resolv.conf

    # Generated by NetworkManager
domain dc.dc.cox.net
search dc.dc.cox.net
nameserver 68.105.28.11
nameserver 68.105.29.11
nameserver 68.105.28.12

>    Can you ping something?  Try "ping google.com".  If that doesn't work, try
    "ping 74.125.45.100"

   PING google.com (74.125.45.100) 56(84) bytes of data.
64 bytes from yx-in-f100.google.com (74.125.45.100): icmp_seq=1 ttl=56 time=32.0 ms
64 bytes from yx-in-f100.google.com (74.125.45.100): icmp_seq=2 ttl=56 time=27.7 ms

   >> What is the output of the "route" command?

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.122.0   *               255.255.255.0   U     0      0        0 virbr0
98.169.152.0    *               255.255.248.0   U     1      0        0 eth0
default         ip98-169-152-1. 0.0.0.0         UG    0      0        0 eth0

    >What files do you have in your /etc/sysconfig/networking/devices directory.
    >Post them here.

     ifcfg-eth0

  # Silicon Integrated Systems [SiS] 190 Gigabit Ethernet Adapter
DEVICE=eth0
HWADDR=00:1e:90:e1:05:40
ONBOOT=no

Here is another thing that might help

eth0      Link encap:Ethernet  HWaddr 00:1E:90:E1:05:40  
          inet addr:98.169.155.38  Bcast:98.169.159.255  Mask:255.255.248.0
          inet6 addr: fe80::21e:90ff:fee1:540/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10756 errors:29 dropped:0 overruns:0 frame:29
          TX packets:125 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:780151 (761.8 KiB)  TX bytes:14868 (14.5 KiB)
          Interrupt:19 Base address:0xdead 

    After answering these questions we'll be in a better position to help you.

    -- 
    MELVILLE THEATRE ~ Melville Sask ~ http://www.melvilletheatre.com

I looked at these before and tried to compare them when running the verizon dsl network.
Hopefully you can see problems.

    -
    Message: 6
    Date: Tue, 16 Jun 2009 15:25:13 -0300
    From: Fernando Cassia <fcassia at gmail.com>
    Subject: Re: Baffled by a Cable Modem
    To: dnvot at yahoo.com, "Community assistance, encouragement,    and advice
        for using Fedora." <fedora-list at redhat.com>
    Message-ID:
        <52733fad0906161125t6a4e6e4jad1a8bc398c9c610 at mail.gmail.com>
    Content-Type: text/plain; charset=ISO-8859-1

    On Tue, Jun 16, 2009 at 2:50 PM, <dnvot at yahoo.com> wrote:

    >
   > Two things come to mind: MTU size, and Mac address. You could also try
   > using a fixed IP address instead of DHCP to eliminate another layer of
   > trouble.

The MTU is 1500 -see ifconfig above. Is that OK? It is the same as on the Verizon set-up

   >Do you have the cable modem's IP address as the default router? That's
    >all you need, often.
  I don't think I do - and I don't know how to do it. Wouldn't the IP change on a DHCP boot? Thanks for the input. Sorry if I am a little dumb about this stuff.
    FC

    ------------------------------

    Date: Tue, 16 Jun 2009 14:44:04 -0400
    From: Tom Killian <tom.killian at gmail.com>
    Subject: Re: Baffled by a Cable Modem
    To: fedora-list at redhat.com
    Message-ID:
        <e7bbf08d0906161144p4cb3f666vcf3fc1cfdb6a055a at mail.gmail.com>
    Content-Type: text/plain; charset=ISO-8859-1

   > Check the MTU.  The default is 1500 bytes, but some providers use a
   > smaller value (e.g., on a DSL connection running PPPoE, the MTU is
    > 1492 bytes).  If the interface MTU is set to a value smaller than 1500
   > (left over from a DSL configuration?), packets from the cable modem
   > are probably being lost.
 thanks. It seems OK.

    ------------------------------

    From: "Mike Burger" <mburger at bubbanfriends.org>
    Subject: Re: Baffled by a Cable Modem
    To: dnvot at yahoo.com, "Community assistance, encouragement,    and advice
        for using Fedora." <fedora-list at redhat.com>

    > It sounds, to me, like you're connecting from your PC to the DSL modem,
    > and attempting to connect using PPOE software.
   I did a lsmod and saw nothing about ppoe, I also did a search of /var/log/messages for ppoe with no results. Is there somewhere else I should look?

   > You may be better off using a router, instead...let it handle all the
   > authentication and negotiation, and just let your PC connect through the
   >  router, and do what it does.

I think I will Fight On here for a while. I don't know anything about routers, and I guess it would cost money. Maybe later. Thank you for the input.
    -- 
    Mike Burger
    http://www.bubbanfriends.org

Another thing that is baffling to me is that Google Earth works fine. I looked at tokyo, which I am sure I never did before, to avoid a cacheed answer. It worked fine and the modem lights were real busy.    

You guys are great.
    ------------------------------

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