Lan card auto disconnect & connect.

[malik0080]

Hello everyone,
i am facing the problem of lan card auto disconnect & connect.I have an assembled pc dual core with realtek lan card.Some days before everything was ok.But from 2 days this problem occurred.I googled related to this & found nothing working. Please help...
i am using tenda router & connected 4 others computers also which working fine on this lan cable.Unistalled lan driver installed new from rtl site.
disabled energy efficient ethernet.
disabled shutdown -wake on lan.
reset winsock
reset ipv4
reset ipv6

 

[GokAy]

When you say disconnecting, does it change to red cross or yellow no internet connection (limited)?

All PCs have dynamic IPs? Any other DHCP server running in the network?

Try a System Restore to a date prior to the issue - http://www.sevenforums.com/tutorials/700-system-restore.html
Is that 2nd DNS server (202.56.230.2) working? Run in cmd:

nslookup
server 202.56.230.2
[URL="http://www.google.com"]google.com[/URL]

Does it respond back with the IP addresses?
If not remove it.

 

[malik0080]

thanks for the reply

its went yellow first & than shows unplugged,sometime in network connection there is no connection of lan card.
I formatted the windows 7 installed a new 1 & checked, found same problem, than i installed win XP & the problem is still there
right now i am using win 7 *64 & no solution.
there is no another DHCP , When i ping to any IP even router IP address its HOST UNREACHABLE.

 

[GokAy]

If it is still same with both Win 7 and XP, either router needs a factory reset or ethernet card is malfunctioning. Try factory reset (check router manual).

 

[malik0080]

Tried factory reset. No solution......On this cable & router its working fine on another computer....

 

[GokAy]

Try changing MAC Address of the network card with Win7 MAC Address Changer v2.0
Take note of original and then change last 2 fields.