Simple Network Troubleshooting
Tips
Here are a few tips that
you can try to fix your
network. Please follow
the steps listed below
in the same sequence.
1) If you have installed
any firewall like Zone
Alarm or Norton Personal
Firewall, please disable
it.
Windows XP comes with
"Internet Connection
Firewall". Disable
it temporarily.
Most network problems
may be due to improperly
configured firewalls.
I have encountered cases
like Windows file sharing
fails to work when the
firewall on the PC is
improperly configured.
2) Note the TCP/IP settings
from the PC that fails
to connect to the network.
Compare this settings
with the other good PC.
Ensure it is using the
same network address and
subnet mask.
Use Winipcfg for Win9x
PCs. For Win XP or Win
2000, use ipconfig from
command prompt.
3) "ping itself
then ping others"
method
The problematic PC has
an IP address of 192.168.1.1,
named hulk.
"ping 127.0.0.1"
"ping localhost"
"ping 192.168.1.1"
"ping hulk"
If either one above got
no reply, TCP/IP stack
got problem.
For WinXP, you need to
reset the TCP/IP stack
with:
netsh int ip reset
resetlog.txt
Next ping other PCs on
the network:
"ping 192.168.1.2"
"ping neighbour"
"neighbour"
is the name of the other
PC. If ping fails with
name, that means there
is a NetBIOS name resolution
failure. Make sure that
NetBIOS over TCP/IP is
enabled. You will get
this errors:
Unknown host <name>
or Ping request could
not find host <name>
If the problematic PC
can ping the other PC
but cannot access the
internet, then you need
to check the default gateway.
Make sure the TCP/IP
default gateway setting
is set correctly.
ping the gateway IP address
(if fails, the default
gateway is down)
ping the dns IP address
(if fails, the dns server
is down)
You can set it to the
DNS IP address provided
by your ISP. It is unlikely
that the ISP's DNS server
to be down.
ping external website
IP address (ISP proxy
down or the website is
down)
ping www.blarblar.com
(DNS server down or website
down)
Good Luck!
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