When I connect second PC to router, both PC's request timesout, why?

I have Netgear Router with 4-port switch, Router uplink connected to
Cable modem, I have 4 wired ports on router, when I connect my XP PC,
there is always internet connection to the PC, when I conect second
PC(win 2k/Linux) to the router port, then both PC's loosing internet
connection, my both ping programs on both PC's prints "request times
out" message, what was the reason?.

Can you ping each machine from the other?

Dan

"Santa" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) om...
> I have Netgear Router with 4-port switch, Router uplink connected to
> Cable modem, I have 4 wired ports on router, when I connect my XP PC,
> there is always internet connection to the PC, when I conect second
> PC(win 2k/Linux) to the router port, then both PC's loosing internet
> connection, my both ping programs on both PC's prints "request times
> out" message, what was the reason?.

On 30 Jun 2004 10:34:12 -0700, (E-Mail Removed) (Santa) strung
together this:

>I have Netgear Router with 4-port switch, Router uplink connected to
>Cable modem,

Shouldn't that be the 'WAN' or 'internet' port?

>my both ping programs on both PC's prints "request times
>out" message, what was the reason?.

Well, that's a rather vague question with thousands of answers, but
it's worth a shot I suppose.
What are the IP addresses of these two machines?
--

SJW
A.C.S. Ltd

On Wed, 30 Jun 2004, Lurch <(E-Mail Removed)> wrote:
> On 30 Jun 2004 10:34:12 -0700, (E-Mail Removed) (Santa) strung
> together this:
>
>>I have Netgear Router with 4-port switch, Router uplink connected to
>>Cable modem,
>
> Shouldn't that be the 'WAN' or 'internet' port?

That could be the problem if the modem is in fact connected to Uplink port
(dumbed down to just a switch) instead of modem to WAN port. The cable
DHCP may only give out a single IP.

>> my both ping programs on both PC'sprints "request times
>>out" message, what was the reason?.
>
> Well,that's a rather vague question with thousands of answers, but
> it's worth a shot I suppose.
> What are the IP addresses of these two machines?

In other words what is output of /sbin/ifconfig and "/sbin/route -n" in
Linux or ipconfig and "route /print" in Windows?

--
David Efflandt - All spam ignored http://www.de-srv.com/

Yes, I can ping each PC from another (win2k to xp and viceversa).

The router is gateway, which had DHCP, gateway IP is 192.168.0.1, My
XP machine Ip is 192.168.0.2 and Win2K PC IP is 192.168.0.3.

On Wed, 30 Jun 2004 18:58:58 +0100, Lurch wrote:

> On 30 Jun 2004 10:34:12 -0700, (E-Mail Removed) (Santa) strung
> together this:
>
>>I have Netgear Router with 4-port switch, Router uplink connected to
>>Cable modem,
>
> Shouldn't that be the 'WAN' or 'internet' port?

I would say. I have a Linksys firewall/router. It has an uplink port on
one side (actually cross-wired to port#1 internally!), and the WAN port on
the other side. Hmm, that reminds me, I once mis-connected a different hub
like that. I had a computer in both port#1 and the uplink port. Didn't
work worth a damn. Odd errors, too, I suppose lots of collisions?

>>my both ping programs on both PC's prints "request times
>>out" message, what was the reason?.

Check your wiring. Is yours a firewall/router? or regular hub? If just a
hub, I'd consider getting a firewall/router. They're less than $100 these
days, and you'll be glad you did (no "cracked" machines by script kiddies).

> Well, that's a rather vague question with thousands of answers, but
> it's worth a shot I suppose.
> What are the IP addresses of these two machines?

--
Juhan Leemet
Logicognosis, Inc.

You didn't say what IP addresses those computers have. Could it be they are
the same?
If the router provides DHCP then it should not be an issue. Even so, you
might assign IP addresses by DHCP in a part of the range that you aren't
using for static IP addresses - just to be safe. It sure can't hurt with so
few computers involved!

If they're the same then they probably couldn't ping each other though....
but it might explain loss of connectivity.

What happens if the XP machines of off the router. Does the Win2K/Linux
machine see anything? Can it ping the router or reach the internet in that
situation?

Any firewalls that might prevent internet access?

You didn't say how you're connecting to the ISP.
If you had connection software running on the XP machine
and, if you are passing the IP address straight through the router without
using NAT, then the problem your'e having might happen I guess.

The router should be making the connection to the ISP, getting the internet
IP address from the ISP and should be translating that IP address into your
internal private IP addresses on the LAN.

You are using NAT and you are using private range IP addresses on the LAN,
right?

Fred






"Santa" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) om...
> I have Netgear Router with 4-port switch, Router uplink connected to
> Cable modem, I have 4 wired ports on router, when I connect my XP PC,
> there is always internet connection to the PC, when I conect second
> PC(win 2k/Linux) to the router port, then both PC's loosing internet
> connection, my both ping programs on both PC's prints "request times
> out" message, what was the reason?.

This is not really a common issue here, because your setup is VERY
BASIC.

You have a router that works because it has 1 xp client that is able
to browse the web. This means Life is good here, DHCP is working
hardware is all good.

You add a SECOND client and Everything loses connection. HMMMMM! This
seams PURELY Hardware to me OR IP CONFLICT but your XP client machine
would probably notify you of this problem and/or the second added
machine. I HAVE SEEN THIS BEFORE, could u possibly have the same MAC
address on both machines? But you would also get a warning.

When you add the additional machine, do you notice ALOT of activity on
the router? Try a DIFFERENT NIC on the second machine for testing
purposes.

Let's just think about this. WITH OUT the adding of the SECOND
MACHINE EVERYTHING WORKS FINE. This means I would not play with any
firewall or NAT settings. EVERYTHING IS WORKING. YOU add a SECOND
MACHINE and EVERYTHING STOPS WORKING. Play around with your hardware.
The router could even be faulty. WHO KNOWS but i think it is hardware
related.

Run a packet sniffer on the XP client machine, EVEN THO in a switched
network environment you cant see everything you WILL see broadcasts.
If there is a duplicate IP or some trouble you MIGHT see the BROADCAST
of the error before they both fail. OR AT LEAST WHY YOUR nic isnt
working.

all the PC's get IP address from Router. Router is connected to Cable
Modem, DHCP is enabled on the Router, this is Router-cum-4 port
switch, As soon as I turned on second PC, the both PC's looses
connection, I installed (WinPcap) can this be used to sniff teh
packets?. Any other suggestions please.

Also, If I turnoff Xp and turn on the Linux machine, everything OK,
whenever I add second one this happens, also I verified the IP
addresss, all are different, main Gateway is 192.168.0.1 and all
others are .2 and .3 Ip adderesses. I verfied "route print", it says
192.168.0.1 is default gateway. But still as soon as I add secondf
one, both timesout.