Hi,The (recent) updates of WinXP has caused a Wndows component called "Internet Gateway Devices Discovery" to be installed. When opening the network connections folder, it appears on top of if as "Internet Gateway". If examining its settings, it essentially shows the devices which, on the local network, will accept Internet connection. It also show a little map from the computer to the Internet gateway and from the to the Internet (a mini version of the map that appears with Vista or Win7).The problem which I discovered is that if you disconnect it, you not only loose Internet connection for that computer but ALSO for the other computers that share the same VDSL modem to access Internet. Indeed, disconnecting this Internet gateway results in the VDSL modem (SAGEM) to disconnect it-self from the ISP. So, all computers in the LAN loose their connection... This is very annoying, as it may create problems ... (one user may disconnect Internet access for all other users...).Note added: I also have discovered that among the "services" shown one sees the FTP servers present on the LAN( I do not understand why, as an FTP server cannot be used to access Internet !). Now, if one unchecks the FTP server, the SAGEM modem ... unactivates it at the levle of the port-forwarding and the server becomes inaccessible until the port-forwarding is reestablished manually...All that can be made WITHOUT having to enter the password set for protecting the modem because it goes through the UPnP protocol that bypasses the web access to the modem ....The solution I found is to remove "Internet Gateway Devices Discovery" component, but is this the only solution ?Any suggestion ? 1 person needs an answerI do too

HiI am Not familiar with your specific ISP.In most cases to use multiple computers in a Network, while sharing one Internet connection, there is a need for a Router.The Router also keeps the connection alive through its WAN port entries, and thus the computers have No roll in the autentication of the Internet connection.You seem to have a None conventional Network topology, please describe it in more details.Example, http://www.ezlan.net/PPPOE.html Jack-MVP Windows Networking. WWW.EZLAN.NET

Hi Jack,Thank you for your reply.Here is the description of my settings:1. Topology----------- 3 computers (2 WinXPSP3 and 1 Vista SP1) connected (wire) to a hub (switch)- the switch goes to the VDSL modem SAGEM F@ast - the modem is connected to the phone line 2. Functioning---------------- the modem is accessing Internet using PPOE and distributes LAN private IP adresses (192.168.xxx.yyy) to the computers (so, it is a modem/router)- the configuration of the modem is by web access (192.168.1.1.) and is protected by a password.3. Problem----------"Internet Gateway Devices Discovery" is in effect in the WinXP computers and "Internet" appears as one of the connections in the "Network folders" above the physical connections ( Then if THAT "Internet" connection is disabled (on any of the 2 WinXP computers, then this computer does not have access to Internet any more AND the connection of the modem to the ISP is also shut off (this requires no password).Result: all other computers lose Internet access until the connection of the modem to the ISP is manually re-established (either by re-enabling the "Internet" connection on the computer where its has been disabled [no password required] OR by accessing the modem through its web interface and manually reconnecting it to the ISP [this requires a password to access the web interface]).IMPORTANT: the other computers do NOT access Internet through the computers in which the Internet gateway has been disabled but directly through the modem via the hub.4. Interpretation (and question)--------------------------------The "Internet Gateway Devices Discovery" communicates to the modem through UPnP (which requires no password) and the modem (wrongly) interprets the information sent by the computer that it disables its Internet access as an instruction to shut the PPOE connection to the ISP...The modem uses Jungo Open_RG software (http://www.jungo.com/openrg/pr_openrg.html) I saw one post on another forum suggesting that this may also happen with other modems (see http://forums.techguy.org/tech-tips-tricks/365202-removing-internet-gateway-connection-network.html and go to the bottom of the post), but this is an old post and it seems that the person has only one computer; so, it may different from what I describe). Any idea ?

HiI am not familiar with your provider and its way of connection.Usually when you have a Router, there is No need for any managing software.The PPPOE is kept alive by the Router's WAN port and it the LAN should Not interfere with it.If the way your system set with its software is obligatory for your type of connection, your ISP is the one that needs to deal with it.Otherwise it might be that the solution is to get rid of the Jungo Open_RG software. Switch off uPnP, and uninstall any other software that involve s PPPOE or managing the LAN and the Connection.Some ISPs give the users Managing software that might help to save few minutes of configuration (and keep the users ignorant about their system). This software many times hinders the Network when it grows beyond one computer and employs newer OS’.-------------------Log to this page and download the DHCP patch for Vista, employ it on your Vista computer just in case.http://support.microsoft.com/kb/928233Unplug the XP computers. Make sure that the Vista computer is clean from any of the "Junk" related to the PPPOE or discovery.Use the instructions on this page and try to connect manually through the browser to the Router with the Vista computer, make sure that the Router is configured correctly, and see if you have an Internet connection. http://help.optuszoo.com.au/help/dsl/connected/windows/optus_modems/sagem_1201If you do get a connection with Vista only, clean the XP computers too. Jack-MVP Windows Networking. WWW.EZLAN.NET

Dear Jack,Thank you for your reply. Eventually, I'll indeed have to talk to my ISP, but the problem is that they are totally unable to answer this type of question. Indeedn the modem is imposed not by them but by the Belgian telecommunication company (Belgacom) that operates the network on which ISP works. And the modem was designed by SAGEM for Belgacom, but both refuse to give the details about how it works. I cannot use another modem, as it may not work on the network. This seems silly, but it is the reality.Anyway, I solved the problem by removing Internet gateway Devices discovery on the two XP machines, and I will not disable it on the Vista. So far, the system works.By the way, MANY thanks for the link to KB928233. Indeed, I got this problem (no IP address from certain routers) when traveling with my Vista computer (it is a laptop) and it may well be caused by what is described in this KB. I'll try it next time I have the problem to see whether the fix cures it. Do you know if I need to reboot the computer after applying the fix or whether it will work immediately. This will indeed enable me to see whether the problem is caused by this broadcast flag issue...Paul

HiI am glad that it is working. The rule is, if in doubt Reboot . Jack-MVP Windows Networking. WWW.EZLAN.NET