I have some computers on my network where DNS resolution in Windows XP Home does not work. I can ping an outside IP address, but I can't ping an outside address if I ping by name. I've tried booting the computer in safe mode with networking and it still has the same problem. I've tried changing DNS servers but that doesn't do anything. I have also reinstalled the drivers but that does nothing for me. DNS servers, or domain name servers, are what make it possible for your internet-connected device to look up a website by its domain name (URL) and receive an an IP address in return. Without the IP address of the website you are trying to visit, your device cannot download the contents of that website and your connection will not work. The HOSTS file appears to be normal. I have 2 computers that are affected by this and both are Windows XP Home and both occured at the same time. However, I'm in WIndows XP Professional and I don't have this problem. The Home machines are up to date in terms of patches. It is beginning to seem more and more like a virus/trojan to me than some kind of glitch in Windows. Can someone please tell me how to resolve this issue and confirm that this is a virus/trojan? Your XP machines should probably be using the router as your DNS server. That will elimate the need to contact outside DNS servers. Is your Netgear getting it's DNS information from DHCP? Check in your Netgear's interface what machines it is using for DNS. If it is nothing, see if it can get that information from DHCP from the ISP. If not, check with your ISP what DNS servers you can use and set it manually in the NetGear. Also, some routers have an nslookup or a ping utility. See if you can use it to ping by name or look up a name. Try this: Find out what your DNS servers' IP addresses are (if you don't already know). Say, for example, one is 10.1.1.1. (the following is assuming you can ping the DNS server IP address from the PC. If you can't then you definitely have a problem in your router somewhere, but from what you're saying it doesn't sound like this will be the problem) Drop to a Command prompt and try to telnet to that IP address on port 53: 'telnet 10.1.1.1 53'. You should just get a blank screen. If so then at least you can talk to the DNS server itself. If you get a timeout or a connection refused then something (most likely your router) is blocking it. If it's not working, try eliminating the router by your cable/DSL modem directly to the problematic PC. This should enable it to get an IP address directly from your ISP's DHCP server. If it works then, it's probably the router (though I've never seen that happen before.weird) BTW, nslookup is simply a DNS testing utility. If you type, say, 'nslookup experts-exchange.com' you chould get a response from your DNS server telling you it's name and IP address and the IP address of the domain you requested: Example from my machine: C: Documents and Settings bwhite>nslookup experts-exchange.com Server: baran.ronconet.com Address: 208.247.106.7 Non-authoritative answer: Name: experts-exchange.com Address: 64.156.132.140 Hope this helps! Internet Connection Firewall is not turned on. This is what I get from nslookup DNS request timed out. Timeout was 2 seconds. *** Can't find server name for address 24.205.1.14: Timed out DNS request timed out. Timeout was 2 seconds. *** Can't find server name for address 66.215.64.14: Timed out *** Default servers are not available Default Server: UnKnown Address: 24.205.1.14 as for brett's entry, just because you can't ping a dns server does not mean its down. Pinging uses icmp packets while dns requests typically use udp packets. Therefore, a server admin can firewall the dns server from the icmp packets and it would still work as a dns server. As i have already said in a comment up above, i have already established that the problem is with my netgear router/switch combo. Here's another wierd thing i've just noticed. On my windows xp machines, dns will only work if my ip is set to 192.168.0.2. If i change it to 192.168.0.3, or anything else for that matter, it won't work. On top of that, i have a windows me machine and a linux machine and both will work regardless of the ip assigned. I am curious if i add another win98 or nix machine if either one of those will also have its dns fail but unfortunately, i don't have another machine to test that out. So, anyone think they can figure this out? Btw, i've tried looking for something that is blocking specific ips in my router configuration but there is no such option. How to find excel version. I've also reset my router to factory settings. Hi, You should be able to enter the routers web admin page or similar and check out it's firewall. If you can post the information given on the routers web page for the firewall, we can have a look and verify that it is a problem with the router. When you said that you can set the IP to '.2' and it works, I assume that this is manually configured. When you change it to '.3' are you leaving it as manually configured or setting it back to be a DHCP client? It sounds like the firewall is blocking all requests for ip's that are not '.2' so if you can post the routers firewall config here, we can have a look at it for you! Just refresh the DNS resolver cache.
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