XP cannot ping W2K

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I have 2 machines at home one running on XP and the other on W2K. I have a wireless router goes to the internet and both machines getting IP from it using DHCP. Hence the ip for the 2 machines are 192.168.254.x From the W2K mahcine, I can ping the XP mahcine and access the web server in it (Apache). However, from the XP machine, I cannot pint the W2K machine and cannot access the web server in it. I have tried disable the perosonal firewall in both machines. And have also tried to enable all ports in the firewall for the subnet 192.168.254.x Whatelse I need to check then? Regards, Vol
ASKED: July 8, 2005  4:42 AM
UPDATED: July 24, 2005  6:30 PM

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Have you done the usual connectivity checks: Can you ping the loopback address? Can you ping your own IP? Can you ping the router? If you perform a tracert, is it going to the right place? Have you swapped the ports and cables to check for physical damage? Have you updated the drivers? Have you swapped the cards around? If you have personal firewalls on the machines, you should add your network to the trusted network option of the software, rather than manually open all ports. Have you checked the machine for malware? When you do run ipconfig, do you get unusual characters appearing (wingdings looking things)?

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  • Volyip
    I have performed the bolow: In W2k machine, I can ping itself, I can ping the XP machine, and I can access the web server in the XP machine. In XP mahicne, I can ping itself, I can ping the router, but I cannot ping the W2k machine nor I can access the web server in the W2k machine. Both machines can go to internet. I tried to stop the personal firewall in both machines. But the result is still the same. When the personal firewall is running on both machine, I actually has open all the traffic for the subnet 192.168.254.x
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  • Cptrelentless
    Do you have any existing routing tables in your router that may be sending the packets somewhere else? Have you run tracert to see? A useful free packet monitoring software package is ethereal. If you have a look at the packets going in and out of the interface this may help.
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  • Volyip
    The router does not have routing table, I believe. I do a tracert in XP to tracert the W2K's ip address, however, it does not go anywhere and just shows request time out....
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  • Bobkberg
    Ok, let's expand a bit on cptrelentless' reply. I'm guessing that you need some more background. What he's referring to is checking the PC's routing table. Whether you know it or not, most computers (using IP) build a routing table. You can view it by opening a command prompt and typing "route -print" (minus quotes, followed by the Enter key) Another thing to check on is the ARP (Address Resolution Protocol) cache. This is the "mapping" between a MAC (Ethernet) address and the IP address. Each computer will have an ARP entry for any other system on the local subnet with which it has communicated. You view this by typing: "arp -a" at the command prompt. As cptrelentless also suggested, you need to run a "tracert IP" at the command prompt to see if it's getting there. At the risk of getting too technical, you should learn how to use a sniffer (like Windump/TCPDump/Ethereal) to see what traffic is passing by. Bob
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  • Cptrelentless
    Thanks Bob. If the packets are being dropped, are they being dropped at the router, i.e. does tracert show the router? If so, your problem is there. Have you updated the firmware for the router? Have you tried resetting it?
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  • Netguru
    I've had similar symptoms when a VPN driver is loaded in the IP stack (unlikely, but possible). Do you use the machine to access computers at your workplace? I've also had something like this happen after removing certain programs or spyware. It might be worth running a TCP/IP stack reset utility. I use WinSockXPFIX--here is one link for it with instructions: http://www.iup.edu/house/resnet/winfix.shtm or you can google for other download sites.
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  • Volyip
    All, thanks for reply. I tried to do a "route add" to add a static route to the w2k machine in the xp machine. But xp still can't ping w2k. Both machines are suing wireless card to access internet through the wireless router. They both can access internet and have no problem. W2k can actually ping xp machine. I have tried stopped all personal firewall, XP firewall as well as the VPN software (Securermote). Still, only W2K can ping XP, but not vice versa. I do a tracert to W2k machine in XP machine, but it goes no where. Not even the router. I dont' have a sniff software yet but I will try to find one. Just my curious, if W2k can ping Xp but not the other way, which mahcine is potentially having problem? W2k or XP?
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  • Vdnet666
    One more idea is to disable network card in xp (not wireless) or in w2k. Are U positively sure subnet masks are the same, btw?
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  • Volyip
    The ip and Subnet Mask are getting from wireless router using DHCP in both machines. So the subnet mask are identical.
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  • Mrcyborg
    have you done an ipconfig /all, this will give you the ip address of the dhcp server (router) etc. Do this on both PC's to make sure you are getting the right IP addresses. Does your router use DNS if so are the settings correct. On your router you should be able to check your dhcp lease make sure the correct MAC addreses are there of your wireless cards. One other thing to try is a static IP address.
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  • Bobkberg
    The most direct way to get a sniffer is to go to www.ethereal.com and download ethereal. In your case, go to downloads, and select one of the Windows installer packages from a site in your country. You'll also need winpcap (packet capture library)from www.winpcap.org. Learning how to use a sniffer is an essential skill in troubleshooting any network. Bob
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  • MennoT
    Routing cannot be the problem, since the responses to the ping from the Win2k host find their way back without a problem. Before going to sniffing, there is one thing more you could try. On the XP machine, start monitoring TCP connections by issuing the command 'netstat -an 1 >file' in a command shell, where file is the name of some file to collect the data in. Every second, the data will be written. Now make an attempt to connect to the web server. When this times out (is that how it ends? what message do you get?), go back to the command shell and issue Control-C to stop the netstat command. In the output of this command, collected in the mentioned file, you will see the status of (attempted) sessions, every second. For instance, you might see, that the http session to the win2k box remains in the status SYN_SENT. This means, that a session request has been sent, but no answer has been received. Otherwise, you might see another status, or nothing at all. In the latter case, the problems are at the XP box for sure.
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