Cannot contact wired computer from wireless network

My Internet connection is as follows:

1) My cable modem connects to a hub.

2) My hub connects to two computers, by wire. My hub also connects to
a Linksys WRT54G wireless router, by wire. All three devices have IP
addresses 24.x.x.x and all three have the same subnet.

3) My WRT54G wireless router supplies Internet access to my laptop. My
laptop gets (through DHCP) an internal IP 168.192.x.x.

Problem:

I cannot connect from my laptop to either of the wired computers in
the network.

My WRT54G has built-in traceroute and ping functions. I cannot even
use these features to ping my desktop computer using its IP address
(24.x.x.x).

On my laptop, when I try to connect via ftp to my desktop computer, I
see that the SYN_SENT packet has been sent when I run netstat. But my
desktop computer does not receive the SYN_SENT packet.

When I am at school, connected to their wireless network, I can
connect to my desktop computer without any problem.

Any one have a solution?

"Rory" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) om...
> My Internet connection is as follows:
>
> 1) My cable modem connects to a hub.
>

Why does your modem connect to a hub and not the WAN port of the router?

That's because they are separated by the router's NAT/firewall. Your
desktops are on the public / WAN side with no protection at all, but your
laptop is in the private / protected network.

Connect the modem to the wireless router, and connect the desktop PC to the
LAN ports. You don't need the hub anymore. Now all machines will get the
protection of firewall like NAT, a DHCP server, etc., they will be on the
same 192.network, they will be able to see each other,etc.

In your existing config - the computers connected to the hub are at
risk....as you can tell since you can easily get to them from the internet.
Your desktops must be riddled with spyware, adware, Trojans, viruses, etc.
You probably need some serious cleanup.

Under the new/correct config, if you want to access the machines that are
behind the firewall - you will need to open the ports (ftp 23, http 80, etc)
to get to them.

"Rory" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) om...
> My Internet connection is as follows:
>
> 1) My cable modem connects to a hub.
>
> 2) My hub connects to two computers, by wire. My hub also connects to
> a Linksys WRT54G wireless router, by wire. All three devices have IP
> addresses 24.x.x.x and all three have the same subnet.
>
> 3) My WRT54G wireless router supplies Internet access to my laptop. My
> laptop gets (through DHCP) an internal IP 168.192.x.x.
>
> Problem:
>
> I cannot connect from my laptop to either of the wired computers in
> the network.
>
> My WRT54G has built-in traceroute and ping functions. I cannot even
> use these features to ping my desktop computer using its IP address
> (24.x.x.x).
>
> On my laptop, when I try to connect via ftp to my desktop computer, I
> see that the SYN_SENT packet has been sent when I run netstat. But my
> desktop computer does not receive the SYN_SENT packet.
>
> When I am at school, connected to their wireless network, I can
> connect to my desktop computer without any problem.
>
> Any one have a solution?

Other posters have addressed your post. Note IP of 169.xxx.xxx.xxx means
network adapter is not getting a
private IP (192.168.xxx.xxx) from DHCP but instead generates a 169.xxx
address.


"Rory" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) om...
> My Internet connection is as follows:
>
> 1) My cable modem connects to a hub.
>
> 2) My hub connects to two computers, by wire. My hub also connects to
> a Linksys WRT54G wireless router, by wire. All three devices have IP
> addresses 24.x.x.x and all three have the same subnet.
>
> 3) My WRT54G wireless router supplies Internet access to my laptop. My
> laptop gets (through DHCP) an internal IP 168.192.x.x.
>
> Problem:
>
> I cannot connect from my laptop to either of the wired computers in
> the network.
>
> My WRT54G has built-in traceroute and ping functions. I cannot even
> use these features to ping my desktop computer using its IP address
> (24.x.x.x).
>
> On my laptop, when I try to connect via ftp to my desktop computer, I
> see that the SYN_SENT packet has been sent when I run netstat. But my
> desktop computer does not receive the SYN_SENT packet.
>
> When I am at school, connected to their wireless network, I can
> connect to my desktop computer without any problem.
>
> Any one have a solution?

(E-Mail Removed) (Rory) wrote in news:9a52281c.0501221653.1f78c694
@posting.google.com:

> My Internet connection is as follows:
>
> 1) My cable modem connects to a hub.

It should be connected to the router.

>
> 2) My hub connects to two computers, by wire. My hub also connects to
> a Linksys WRT54G wireless router, by wire. All three devices have IP
> addresses 24.x.x.x and all three have the same subnet.

You don't need the hub anymore. The router has a built in switch that is
better than the hub.

>
> 3) My WRT54G wireless router supplies Internet access to my laptop. My
> laptop gets (through DHCP) an internal IP 168.192.x.x.

The laptop should be getting a private side IP of 192.168.xxx.xxx from
the DHCP server on the router.

>
> Problem:
>
> I cannot connect from my laptop to either of the wired computers in
> the network.

They need to be connected to the router.

>
> My WRT54G has built-in traceroute and ping functions. I cannot even
> use these features to ping my desktop computer using its IP address
> (24.x.x.x).

If the hub was connected to the router, then you would be able to ping
the machines on the LAN behind the router. You need the hub if you plan
on extend your LAN because you have more machines that can be plugged
into the 4 LAN ports on the router.

>
> On my laptop, when I try to connect via ftp to my desktop computer, I
> see that the SYN_SENT packet has been sent when I run netstat. But my
> desktop computer does not receive the SYN_SENT packet.

Why are you even doing it? Are you doing it to send and receive files.
With the router as the gateway device, it will provide the ICS and you
can set the machines to share resouces like it should be done behind the
protection of a NAT router.
>
> When I am at school, connected to their wireless network, I can
> connect to my desktop computer without any problem.

If those machines don't have a host based FW on them protecting them,
they have most likely been hacked to death.

If you want to make contact with a machine behind the router over the
Internet, then you must configure the router to open the appropriate port
(s) by using the port forwarding feature of the router.

http://tinyurl.com/c56t

You should keep the machines out of the DMZ.

The like also explains about NAT and the NAT router and also about hubs
and switches. The router has a built in switch.

Duane

I do not want to remove the hub, since I have multiple servers running
on the wired computers (business accounts are allowed to do so). I'd
prefer not to deal with port forewarding, so by using a hub, I do not
need to deal with this.

I still do not think you have addressed the problem. From my laptop,
which is behind the router, I should be able to communicate with my
desktop computer (via ftp, http, etc.) just as if it were some computer
miles away, since I'm using it's Internet IP address and not it's lan
IP address. I am not setting this up like a lan.

"Rory" <(E-Mail Removed)> wrote in news:1106526729.559216.226200
@z14g2000cwz.googlegroups.com:

> I do not want to remove the hub, since I have multiple servers running
> on the wired computers (business accounts are allowed to do so). I'd
> prefer not to deal with port forewarding, so by using a hub, I do not
> need to deal with this.

>
> I still do not think you have addressed the problem. From my laptop,
> which is behind the router, I should be able to communicate with my
> desktop computer (via ftp, http, etc.) just as if it were some computer
> miles away, since I'm using it's Internet IP address and not it's lan
> IP address. I am not setting this up like a lan.
>

If you only have one IP from the ISP that covers your entire network, then
I don't see how it's going to work. If you had more than one IP from the
ISP and the desktop machine was assigned one and you had a modem that could
handle more than one IP from the ISP, I could see it working somehow. I am
no expert on this. I am curious as to where the desktop machine is getting
its IP and Subnet from. You know where the laptop is getting it from which
is the router.

Duane

Hi Duane.

I have 5 IP addresses allocated to me by my internet provider, which is
another reason that I have no problem with using the hub.

Hi Duane.

I have 5 IP addresses allocated to me by my internet provider, which is
another reason that I have no problem with using the hub.

"Rory" <(E-Mail Removed)> wrote in news:1106540737.797837.202350
@z14g2000cwz.googlegroups.com:

> Hi Duane.
>
> I have 5 IP addresses allocated to me by my internet provider, which is
> another reason that I have no problem with using the hub.
>

Well, you may want to get switch as it will prevent network traffic
collision and speed up the network.

So, you're saying that the laptop has normal Internet access and you can
ping other internet IP(s) or www(s) from behind the router, but you cannot
FTP, Telnet or anything not even ping the IP of the desktop machine that
has a public IP assigned by the ISP.

What happens if you put the machine into the DMZ of the router and try
something of course protecting the machine with a personal FW solution for
the test? And what happens if you do it with a wire connection from the DMZ
of the router or from behind the router with a wire connection can you
establish a connection? I'll assume that the desktop machine has a FW
protecting it that you must set rules to open the appropriate ports.

Duane