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Suleyman Kutlu
Member
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# Posted: 11 Sep 2008 09:03
Hello,
I am using Thomson TWG850-4U in my home network. I have a weird situation that the laptop on wireless network can not even ping the desktop on ethernet nework.
The cable-modem can ping both computer and both computer can access Internet and ping the cable-modem, but not eachother.
Where can be the problem? Any help is appreciated.
Thanks..
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Helpdeskguy
Member
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# Posted: 12 Sep 2008 09:47
it could be that a firewall is preventing the computers from seeing each other.
if you able to, turn the firewall off or open the necessary ports
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Suleyman Kutlu
Member
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# Posted: 12 Sep 2008 10:04
I turned off the firewall and tried the connectivity but nothing changed.
On the otherhand, in normal situations, the traffic should not pass over the firewall because they are on the same TCP/IP subnet. The cable modem, uses the same C-Class subnet for both wireles and wired network and assignes addresses to the clients. So wireless laptop and wired desktop are on the same subnet 192.168.0.x/24.
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Helpdeskguy
Member
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# Posted: 12 Sep 2008 13:17
the subnet looks something like 255.255......
the router assigns different ip's for each device. 192.168.0.2, 192.168.0.3etc.
your trying to go from one mac addr. through the router to another mac addr.
if you have any programs like norton, turn them off and see if it helps
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Suleyman Kutlu
Member
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# Posted: 12 Sep 2008 13:40
Tested, no success.
The IP addresses are 192.168.0.10 and 192.168.0.11, and the subnet mask is 255.255.255.0 (24 bit) on each of the computers and on the modem.
I see the MAC addresses on the Router's Web interface in Network/Computers pages.
There is no firewall (including Windows Firewall) on the computers.
The same two computers can communicate with each other if they are both on wired side.
Also with one of my frieds, we made such a test inhis house with the same device:
- We disaled the firewall on the cable modem
- We connected one laptop to wireless network and the other laptop to the ethernet port.
- They could not ping each other.
- Connected both laptops over wireless network and they could ping each other
- Connected both laptops to the ethernet ports (and disabled the wireless interfces on the laptops), they could ping each other.
During these tests, we did not changed anything on the laptops. So we are sure that firewall configuration or other security sw on the laptops have no effect.
It seems that the problem is on the cable modem side.
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Helpdeskguy
Member
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# Posted: 12 Sep 2008 14:31
i could be a port issue
are you just not able to ping? or can you not communicate at all from wireless to wired pc's
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Helpdeskguy
Member
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# Posted: 12 Sep 2008 14:32
my bad. It could be a port issue
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Helpdeskguy
Member
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# Posted: 12 Sep 2008 14:35
have you tried tcp/ip filtering?
http://technet.microsoft.com/en-us/library/cc77941 7.aspx
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Helpdeskguy
Member
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# Posted: 12 Sep 2008 15:29
here is the user manul for your modem if you dont have it already.
http://www.thomson.net/SiteCollectionDocuments/Pro ducts/User%20guides/Cable/modems%20and%20gateways/ EMEA/userguide_twg850-4_en_092007.pdf
start with pages 35 and 37. hope this helps.
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Shnerdly
Moderator
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# Posted: 12 Sep 2008 18:35 - Edited by: Shnerdly
Suleyman Kutlu
What are the Operating Systems of the problem computers?
It sounds like you have reasonable knowledge of networking but if any of what I say doesn't make sense to you please ask me to clarify what ever it is.
If your computers are on the same subnet with proper IP addresses, they should be able to communicate unless there are firewalls on the computers preventing it. Having said that, are you certain that you are connecting to the correct wireless connection? Perhaps one of your neighbors has the same Modem/Router and your connecting to their network instead of yours. That would certainly prevent communication between the two computers.
I would recommend installing Net Stumbler and see if there are other wireless connections in your area on the same channel. If there are two in the neighborhood with the same SSID it could be the problem. You should check the channel of everyone in your neighborhood anyway just to make sure your not going to interfere with each other.
Also you should set your SSID to something unique to eliminate the possibility of connecting to the wrong network.
Let us know if this did or didn't help.
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Suleyman Kutlu
Member
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# Posted: 13 Sep 2008 04:34
Hi Helpdeskguy,
Thanks for your interest.
Let me clarify somethings:
1. I am testing ICMP and it is not filtered any place, I am sure.
2. If I use the same computers amd the same cable modem without changing any piece of configuration, and connect the computers on the same communication media eveything is OK.
SO it should not be a port issue.
I asked to the manufacturer via mail but no answer yet.
I suspect a defect / bug in the software / firmware.
Did you ever heard such a weird thing?
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Suleyman Kutlu
Member
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# Posted: 13 Sep 2008 04:44
Hi Shnerdly,
My back ground is in networking  and I always believe that, sometimes one can not see a minor point or an ugly configuration bug while others can see easily. So we are all here
The first thiing I set when I buy a ADSL / cable modem is to set the SSID to a Unique one and to set the mac filtering and WPA2-PSK or whatever supported encryption pass phrase.
In this case, I set the SSID to a unique one, set the password.
One of the computers is running Windows Vista Ultimate, the other is running Windows XP. If both computers are on the wireless network or both on the wired network there is no problem.
If one is on wireless and one is on wired network then the problem begins:
- They can all access internet.
- The cable modem can ping both wired and wireless computer
- Both wired and wireless computers can ping the cable modem
- Computers can not ping or communicate between eachother.
- The configuration of cable modem is not changed anyhow during the tests.
- Computers do not have firewall (even Windows firewall is disabled).
I hope I am clear.
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Suleyman Kutlu
Member
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# Posted: 13 Sep 2008 04:46
An addition:
Even if there is a filtering or something like that was missed to be disabled on the computers, they can communicate while they are both on wireless or both on wired network. So this filtering issue can not be the cause of the problem, I think.
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Shnerdly
Moderator
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# Posted: 13 Sep 2008 15:25 - Edited by: Shnerdly
I just needed to see if there was a possibility that the wireless you are connecting to is not from the same source as the wired connection.
Networking is also my specialty so this is quite perplexing. The only thing I saw in the user manual for the modem that might be part of the problem was that the unit can support a "Guest Wireless Connection" but it would be on a different subnet. The manual gives the example of 192.168.2.??? It seems to me that the way it's worded the unit is capable of supporting two wireless subnets at the same time. The one tied to the wired connections and the Guest subnet. It doesn't say if you can assign the same subnet IP's to the guest connection or not but I suspect that either way it would isolate the guest connection from the wired connection. I know you said the IP's are on the same subnet but could this possibly be the problem, that your wireless is possibly on the Guest connection?
One other thought is weather or not you have tried it with the WEP turned off to see if that is possibly the problem. It shouldn't be, but you never know.
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Suleyman Kutlu
Member
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# Posted: 15 Sep 2008 04:30
I did not tried by turning of WEP or WPA2. I am using WPA2-PSK. I will give a try for this.
But I think I am not on the guest network because when I want to connect to the wireles network I am asked the pass phrase and then I am connected to the modem and the internet.
I know that (tested) when I provide a wrong pass phrase, the wireless interface on the laptop shows me as connected but in a few seconds, the link goes down.
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Shnerdly
Moderator
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# Posted: 15 Sep 2008 10:36
The WEP or WPA2-PSK could probably also be setup on the Guest Network.
The info on the Guest Network is a ways past the regular wireless part in the manual. It might be worth looking in to.
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Suleyman Kutlu
Member
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# Posted: 15 Sep 2008 10:44
Ooops, a slight difference in the software I think.
I saw this "Guest Network" topic in the manuals but I did not even looked at it and never thought of where it would be set up.
I have WMM setup after the Bridging setup. I don't have Guest Network setup in the configuration web pages, as shown in the manual pages. I realized this when I looked into the manual pages that you mentioned.
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Suleyman Kutlu
Member
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# Posted: 26 Sep 2008 05:58
The problem is solved by the help of UPC (my Internet provider). The problem was a bug in the software, after appling the fix, everything is working well.
Thanks for everybody for their extensive support.
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wewo
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# Posted: 28 Oct 2008 04:46
Hi board!
I have the same problem, but my UPC helpdesk in austria is not able/willing to help me. Could you please tell me the sw-version of your modem?
Mine is:
System
HW Revision 2.0 VENDOR Thomson
BOOT Revision 2.1.7i SW Revision ST9D.00.25
MODEL TWG850-4U Software Version ST9D.00.25
Software Build and Revisions
Firmware Name TWG850-4U-9D.00.25-080515-S-001.bin
Firmware Build Time 09:27:58 Thu May 15 2008
best regards
wewo
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wewo
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# Posted: 29 Oct 2008 07:00
the austrian service line will tell you that the problem is not supported by UPC  but maybe you will be connected to a better call agent than is was 
keep us informed!
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kangoe
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# Posted: 29 Oct 2008 07:48
After a long discussion with my ISP (UPC Austria), I've been told that they don't have new firmware even I told them there is new one (01.01). They also told me that they can not help on if the problem is internal network as long as all my computers connect to internet.
One thing so bad, we can not update this router(TWG850-4) ourselves. Seems like UPC Austria does not carte about the new firmware.
I am not sure how long we will wait but I may buy a new wireless router.
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krz
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# Posted: 29 Oct 2008 08:22
Minutes ago I was told that UPC Austria has talks with Thomson. If they get an updated firmware, they will deploy it automatically (no user action needed).
When? No information, but it seems that lots of users have this problem, so I have to reset my modem to defaults anyway... argh
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Anonymous
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# Posted: 11 Mar 2009 17:35
Hi to all,
I had the same troubles and today SUDENLY it was working fine, between my WLAN Laptop and desktop PC
Strange because I didnt change anything and the router still have version ST9D.00.25
BR
Shorty
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bkircher
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# Posted: 11 Jun 2009 14:19
I do have the same problem:
Wireless to Wireless or Internet --> OK
LAN to LAN or Internet --> OK
BUT no connection between LAN and Wireless. UPC Support doesn't care about my internal stuff.
Hardware Version 2.0
Software Version ST9D.00.25
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Shnerdly
Moderator
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# Posted: 11 Jun 2009 22:12
bkircher
If you would describe your hardware, we might be able to help.
Need to know what modem and/or router and the operating systems of the computers. Are any firewalls installed?
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bkircher
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# Posted: 14 Jun 2009 07:54
bkircher
If you would describe your hardware, we might be able to help.
Need to know what modem and/or router and the operating systems of the computers. Are any firewalls installed?
Sorry, I thought that the TWG850-4U was clear. I'm using Mac, PC and Printer on the LAN and WLAN.
Currently everything works fine - I have disabled the wireless function an the TWG850-4U and I'm using another WLAN-Router, which is a pity because now I need two electricity guzzler.
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Shnerdly
Moderator
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# Posted: 14 Jun 2009 09:14 - Edited by: Shnerdly
bkircher
I try never to make assumptions on hardware. People often post unrelated problems in threads.
It would seem that there is a common problem specific to the TWG850-4U.
When the LAN to Wireless problem is present, what are the IP Addresses of the two computers. They are internal addresses so there is no security risk in posting them.
I don't have one to look at through the user interface. Perhaps there is a button to tick to allow communication or perhaps it puts the wireless on a different subnet. Does it have a DMZ setup page?
Are you using any software firewalls? Are you sure you are not using the "Guest Wireless" in the modem.
As far as UPC not wanting to help with your internal problem, This is a modem problem. If they own the modem it IS their problem. Se the post of 26 Sep 2008.
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TheLostOne
Member
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# Posted: 29 Jul 2009 14:38
Hello,
I just wanted to ask if there's already a solution.
My parents just got the same device from their ISP (UPC Austria) and they have exactly the same problem.
I wanted to write Suleyman Kutlu asking him to share his fix but unfortunately there is no PM option on this board.
@Shnerdly:
When the LAN to Wireless problem is present, what are the IP Addresses of the two computers. They are internal addresses so there is no security risk in posting them.
When I remember correctly:
wired PC: 192.168.1.11
WLan laptop: 192.168.1.12
I don't have one to look at through the user interface. Perhaps there is a button to tick to allow communication or perhaps it puts the wireless on a different subnet. Does it have a DMZ setup page?
I can't check the settings right now, but according to the URL there's a DMZ setup page.
Are you using any software firewalls? Are you sure you are not using the "Guest Wireless" in the modem.
A software firewall is installed but I checked the settings. Everything is ok and nothing gets blocked.
I have to check next time whether a "Guest Wireless" network is set up or not.
Thanks and kind regards
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user upc austria
Member
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# Posted: 19 Oct 2009 15:39 - Edited by: user upc austria
Hi !
I have the same problem with the Thomson TWG 850 in austria. The internet connection on every computer is working fine but itīs not possible to connect directly between LAN an WLAN. The UPC - helpdesk had no idea about the problem - it was the first time he heard about that... ???
It really seems to be a firmware bug.
Has anyone a solution for upc austria?
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Suleyman Kutlu
Member
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# Posted: 19 Oct 2009 18:16
Hello,
I have written a solution here before (on 26 Sep). It was a bug-fix firmware update from my ISP (UPC in the Netherlands). At that time, they admitted the bug in the firmware and made an update. But...
But after some months, the problem popped up again with another attached problem occuring from time tom time: WLAN interface disabled itself and I could not enable it with an error message "WLAN is disabled, call yoiur ISP". After long long discussions with UPC, I could not get a result. Besides they did not accept the bug in firmware although I told them they have accepted before. Anyway, my solution was to buy a Wireless-N Router and use it for WLAN and LAN at all.
DO NOT USE Thomson Wireless Modems..
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