Re: Xstart Problem with Linksys Router
From: Seth Kurtzberg (
)
Date: Thu May 16 2002 - 16:44:16 EDT
Hong,
You are looking in the wrong place altogether.
It won't do you any good to open up the telnet port, because you are trying
to run X windows traffic. Obviously, telnet traffic is working. That is why
terminal emulator mode works. X traffic typically uses port 6000.
On Wednesday 15 May 2002 12:04 pm, you wrote:
> I see similar questions asked on this usergroup, but couldn't find the
> answer.
>
> I'm using Exceed v6.2 at home on a WinXP machine connected to a cable
> modem via Linksys wireless router (BEFW11S4 V.2). Without the router,
> everything works so I know that it's not the problem with WinXP or the
> cable modem. With the Linksys router, however, the X-window never
> shows up on Xstart. Xstart only works with the "Terminal Emulator"
> mode but I'd like to use it in the "X Window" mode. I understand that
> it's related to the firewall issue, and in fact I got some suggestions
> from the Linksys tech support (see appended message below).
>
> Following Linksys instruction below, I have tried the IP address
> 192.168.1.100 and port number 23 (telnet) in the port forwarding
> setting. I have also tried the DMZ host which should open up the port
> regardless of the port forwarding. I even tried to disable DHCP and
> set up static IP as 192.168.1.100 under both port forwarding and DMZ
> host options. Unfortunately, none of these worked for me. Was there
> something wrong in the IP address or the port number? How do I
> properly set up the static IP address if necessary? If anyone figured
> out the solution to this problem, I'd very much appreciate hearing
> about it. Thank you.
>
> Hong
>
>
>
>
> ====================================================
> The following is the response I got from the Linksys tech support:
>
> Thank you for contacting Linksys Customer Support.
>
> The router has a built-in firewall, which prevents outside users from
> accessing your internal network. Because of this, you have to open
> ports in order to use online applications.The router¡¯s Port Forwarding
> feature allows users from the Internet to access certain services on
> the internal network behind the router without compromising your
> security.
> When you want to use this application, first find out their service
> port numbers.In your case find out the ports used by Exceed
> To specify a server behind the firewall and forward the necessary
> ports, kindly follow these simple steps:
>
> 1. Go to http://192.168.1.1, and input the password for the router
> 2. Go to the ¡°Advanced¡± tab> ¡°Forwarding¡±
> 3. Enter the Static IP address of the computer
> 4. Specify the service port nubmer
> 5. Choose Both for protocols.
> 6. Click ¡°Apply¡± and ¡°Continue¡±.
>
> Lastly, in order for your router to successfully trigger ports, the SPI
> feature of the router should be disabled. This feature checks the state
> of a packet to verify that the destination IP address matches the
> source IP of the original request. SPI opens the ports as needed as
> long as the data transfer session originates from a LAN side computer.
> Think of SPI as "Dynamic Port Forwarding".
>
> The SPI option is an experimental feature. If you enable SPI, it will
> DISABLE THE FORWARDING FEATURE. SPI looks at each packet a little more
> in depth than just normal routing.2 It checks where the packet is going
> and where it is from and remembers this info for the future. If a
> packet comes to your door that has the right routing information, a
> normal NAT might just pass the packet on regardless. However, an SPI
> firewall might say, 'Hey, wait a minute, this packet is from somewhere
> that I haven't visited lately, its unsolicited, so I'm just going to
> ignore it.'
> The SPI option can be found in the router's Filters Page :
> http://192.168.1.1/Filters.htm ; under the Advance tab of the router's
> web utility page.
>
> If the above procedure does not work, then I would advise you to use
> the DMZ host feature. The DMZ Host setting allows one local user to be
> exposed to the Internet to use a special-purpose service such as online
> gaming, audio/video-conferencing, application hosting, etc. DMZ hosting
> allows 1 PC to be exposed to outsiders. This means that this PC will
> not have any firewall protection simply because the computer which is
> specified at this tab is placed outside the router's firewall. It is as
> if you are bypassing the router and directly connecting your computer
> to the modem. This feature can be found at the DMZ Host tab under the
> Advanced tab of the router's web utility page. The computer you are
> intendng to place outside the firewall should have a static IP address
> below that of the IP range of the DHCP server of the router. This IP
> address should be specified at the said tab.
--
Seth Kurtzberg
MIS Corp.
Office: (480) 661-1849
Fax: (480) 614-8909
email:
pager: 888-605-9296 or email
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: Fri May 31 2002 - 23:54:01 EDT
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