Pierre-Alex,
Let's dig into the details of your problem.
If you can plug your PC into the DSL modem's Ethernet port with a crossover
cable and
operate successfully you know that the PC and the DSL modem are not the
problem. You
also know that both the DSL's and the PC's ports are MDI ports. Why?
Normally you use a
straight-through cable from the PC NIC MDI port to a switch or hub's MDI-X
port.. A
crossover cable is used to connect MDI to MDI ports (2 PCs) or to connect
MDI-X to MDI-X
ports (2 switches).
Next you say you connected your PC (and other PCs) into a switch with a
straight-through
cable and then you connected the switch to the DSL modem with another
straight-through
cable. Now you can ping by name but the ping times out.
Are you getting a link light on the switch port connected to each PC and to
the DSL
modem?
This is not a good troubleshooting technique at this point. The successful
ping-by-name
does not prove you are pinging through the switch to the DSL modem to the
Internet
because the name could be resolved by name-cache or hosts file or even a DNS
server on
one of the other PCs plugged into your switch. A better troubleshooting
technique would
be to stick with IP addresses. It would be best to ping to the IP address of
the router
on the other end of the DSL connect at the ISP. (Some other Internet address
would work,
providing the ISP hasn't blocked ICMP echo and echo-reply (ping) to the
Internet.) Use
traceroute or tracert (depending on the PC's OS) and you will see where the
connection
quits.
Try isolating the problem to a box before you get too deep into your
troubleshooting.
Replace the switch with a simple hub and see if the hub works. If so,
someone may have
configured some VLANs on the switch. Take a look at the switch
configuration. Or you may
have a bad port on the switch. Or the UPLINK button may be IN when it should
be OUT.
What kind of switch is it?
HTH,
Jonathan
Pierre-Alex wrote:
> I have a DSL connection and multiple ip addresses.
>
> When I plug any computer directly to the DSL modem (with a cross over
cable)
>
> everything works fine. However when I plug all of the computers and the DSL
> modem to the
>
> switch (with straight through cables) I get "time out" responses when
> pinging the default gateway.
>
> If I ping by name (e.g, ping yahoo.com) I get the name resolved, but the
> pings time out.
>
> It has been a week of troubleshooting and still no light! Anyone?
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