No Network connection

195 pts.
Tags:
IT Network connectivity
Network Connection Problem
Networking
Proxy server
Hi, Iam a user within our cooperate network and just recently I have noticed that everytime I tried to hook to the internet, it seems that the connection failed. I tried several times, but just couldn't help. I even go to the tools on my browser, >>internet option to check might there is any change to our proxy server address but couldn't find anything wrong. For sure I know that I won't be able access the cooperate email as well. Therefore I thought might there is a problem with the adapters so I check the device manager but sees all up and running. I tried checking the cat 5 but its ok. I tried tracert to the dhcp and it failed, I tried pinging the dhcp and it failed as well. No problem with IP addressing cos its dhcp job.
OK when I bring in a laptop or another computer and hook it to the same connection, it just work perfecty. So for me my suspicion is on the pc itself. 
But what  I want is to discuss this so that I solve the problem or even share it with my IT staffs.


Software/Hardware used:
Software/Hardware

Answer Wiki

Thanks. We'll let you know when a new response is added.

It sounds like name resolution (DNS) is not working properly. Confirm DNS settings. It could also be that there are client computer firewall settings blocking these actions on this particular problem computer.

Are you SURE DHCP is working properly? What information does <b>ipconfig /all</b> show? If the address is a 169.254.x.x address, then DHCP is probably not working right on this client. 169.254.x.x addresses are usually locally assigned addresses and are not distributed by DHCP.

-Labnuke99

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  • Subhendu Sen
    Though u did not mention here the OS type, I guessed it is a Windows OS Click Start > Run > cmd and type ipconfig /all, it helps to display computer's DNS suffix, IP address, subnet mask, and default gateway Make sure that computer has the appropriate settings for DNS and WINS servers, an available IP address, the proper subnet mask, the proper default gateway, and the correct host name. Link here for More Info, remember it is based on XP
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  • Subhendu Sen
    Thanks, at least this time my guess worked. However, it is not fair to put ur comments in "Answer Wiki" rather put in "Discussion Area". Labnuke99 also supplied some valuable information about ur Q. So respect his answer / comments and put ur comments in discussion area. Not only thanks me, also give the same to Labnuke99. Hope u understand this and u may overcome this problems.
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  • carlosdl
    Comments by 875431: "you right Rachil. It was windows XP that I am using. Anyway thanks for your contribution. I'll try follow that."
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  • Sixball
    Good steps from both Labnuke and Rechil. Additionally, even if you DO get a solid IP configuration via DHCP, ensure your TCP/IP stack is working fine - just ping the 127.0.0.1 loopback as a double-check. If thats fine, then move up to the next step...
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  • 875431
    I've assigned to obtained an IP address automatically from the DHCP. With this bad pc hooked up on the connectionNetwork, I got a messege\ No network address\. With that my IP and subnet are all set to >0000>. Ok when I brought in a laptop and hook it on the same connection where the bad pc was, it just work fine. but this its my private laptop. Seeing that I'm connecting on our cooperation network, when try pinging DHCP it all returned. But when I do \ipconfig \all I got an different IP from the original pc. Therefore I taught the DHCP is fine. Howerver with original pc hooked on I don't know.
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  • 875431
    Thanx anyway Rachil I've learned from the mistake
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  • 875431
    All, thank you very much for your contribution I have noted down your answers. Hope when I go back to the office on monday, I will fix the problem. Thanx, appreciate your cooperation.
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  • carlosdl
    Did you try the loopback ping suggested by Sixball ?
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  • 875431
    No I didn't.
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  • 875431
    When you talked about loopback what sort of device will i ping, is it my own device or the server?
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  • TomLiotta
    When you talked about loopback what sort of device will i ping... The loopback address is 127.0.0.1. When you ping that address, the ping doesn't leave the device. It simply gets handled within the device itself and verifies that the services for TCP/IP are active. If you run ping loopback from a laptop, the laptop is the only device tested. If you run it from another PC, that PC is the only device tested. Tom
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  • 875431
    Got it Tom. Thank you.
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  • Subhendu Sen
    I hope ur problem is now solved !
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  • 875431
    We'll get back to you with a feedback. I'm a newbie in Networking hence problems beyond control to me, I prefer you guys to help me. So far I learn quiet a few new stuffs and do hope as we go along I'll have alot of tools for troubleshooting a networking problems.
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  • Sixball
    If you stil run into the DHCP errors, can you get the PC online with statically assigned IP info? If neither are working for you, the PCs NIC might be hosed...
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  • 875431
    is it possible to do loopback ping from a client or remote machiine?
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  • 875431
    Hi Sixball, I do the loopback ping and I get an reply. however there was another messege that appears such as this "No network address" I thought individual devices have unique address, but why does this happen? I want to know pliz..
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  • Labnuke99
    Each network device does have a unique hardware (MAC) address that is generated by the vendor. However, that is not enough to communicate on an IP network. Each device must also have a unique and routable IP address to communicate with peers and remote systems. So, in this case, it sounds like the system is getting an autoconfigured IP address (169.254.x.x) and not getting a DHCP address from the network. So, that could be a NIC hardware issue as previously mentioned or cabling problems. More information on IP addressing can be found on Wikipedia.
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  • 875431
    ok, thanks Labnuke99. may be I will tray changing the NIC hardware as suggested. it's become obviouse thats way.
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  • 875431
    hey all, the problem been solved. we finally change NIC hardware and yap, im part of our network again. It is through you that I have instructed our IT support staffs to do this that and eventually its up and running. Once again Thank you very much for your valuable contribution.
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  • Subhendu Sen
    @875431, thanks for ur quick response ! And also thanks to Labnuke99.
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  • Sixball
    Thanks for letting us know! Always start from Layer 1 (physical) and work your way up..
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  • Davidmichel
    With Windows systems more than a few times a connectivity problem was resolved by going to the Windows Device Manager, uninstalling the network adapter, restarting, and then reinstalling it. First download the latest version of the driver for the NIC and copy it onto this system.
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  • Scribble
    make sure your lan is enabled if so try this from cmd type ipconfig /release and then ipconfig /renew this should request an new ip from you dhcp server.
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