Weird networking problem

C

cameronjpu

I am an independent admin helping out a client of mine. They have a
network with only two computers, the router is outside the office (in
the basement). We have a switch inside the office. IP addresses are
manually assigned. Both computers have no firewall but the windows xp
firewall.

They share a folder that is hosted on one of the computers, and
everything has worked fine for a long time. Suddenly late last week,
the remote system could no longer access the host system's shared
files. Can't get to the workgroup even. The weirdest thing is that
neither computer can even ping the other, but the internet never
stopped working perfectly.

The two computers' ipconfig/all outputs are below:

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Susan Stolov>ipconfig/all

***************************************REMOTE
COMPUTER************************
Windows IP Configuration

Host Name . . . . . . . . . . . . : Station01
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/100 VE
Network Connecti
on
Physical Address. . . . . . . . . : 00-16-76-8A-37-EB
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 66.7.37.59
Subnet Mask . . . . . . . . . . . : 255.255.255.248
Default Gateway . . . . . . . . . : 66.7.37.57
DNS Servers . . . . . . . . . . . : 66.7.25.98
64.52.192.98

***************************************SERVER
COMPUTER************************

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Susan Stolov>ipconfig/all

Windows IP Configuration

Host Name . . . . . . . . . . . . : WIPMaster
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/100 VE
Network Connecti
on
Physical Address. . . . . . . . . : 00-16-76-8A-37-EB
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 66.7.37.60
Subnet Mask . . . . . . . . . . . : 255.255.255.248
Default Gateway . . . . . . . . . : 66.7.37.57
DNS Servers . . . . . . . . . . . : 66.7.25.98
64.52.192.98

C:\Documents and Settings\Susan Stolov>

Computers have been rebooted. Switch reset. Tried DHCP but IP
addresses could not be obtained. I'll see if I can access the network
room, it's a building-provided service so that could be tricky.

Any clue about where to start looking?

Thanks.

J

JohnB

Looks like they use 2 static IPs from their ISP. I can ping the DNS server
and the computer named Server Computer (.60)
And you're saying both computers can get to the interent? Even the .59
computer (Remote Computer)? Because the problem appears to be with that
computer. Can you ping your router from that PC? If so, what about your
primary DNS?

cameronjpu said:
I am an independent admin helping out a client of mine. They have a
network with only two computers, the router is outside the office (in
the basement). We have a switch inside the office. IP addresses are
manually assigned. Both computers have no firewall but the windows xp
firewall.

They share a folder that is hosted on one of the computers, and
everything has worked fine for a long time. Suddenly late last week,
the remote system could no longer access the host system's shared
files. Can't get to the workgroup even. The weirdest thing is that
neither computer can even ping the other, but the internet never
stopped working perfectly.

The two computers' ipconfig/all outputs are below:

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Susan Stolov>ipconfig/all

***************************************REMOTE
COMPUTER************************
Windows IP Configuration

Host Name . . . . . . . . . . . . : Station01
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/100 VE
Network Connecti
on
Physical Address. . . . . . . . . : 00-16-76-8A-37-EB
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 66.7.37.59
Subnet Mask . . . . . . . . . . . : 255.255.255.248
Default Gateway . . . . . . . . . : 66.7.37.57
DNS Servers . . . . . . . . . . . : 66.7.25.98
64.52.192.98

***************************************SERVER
COMPUTER************************

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Susan Stolov>ipconfig/all

Windows IP Configuration

Host Name . . . . . . . . . . . . : WIPMaster
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/100 VE
Network Connecti
on
Physical Address. . . . . . . . . : 00-16-76-8A-37-EB
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 66.7.37.60
Subnet Mask . . . . . . . . . . . : 255.255.255.248
Default Gateway . . . . . . . . . : 66.7.37.57
DNS Servers . . . . . . . . . . . : 66.7.25.98
64.52.192.98

C:\Documents and Settings\Susan Stolov>

Computers have been rebooted. Switch reset. Tried DHCP but IP
addresses could not be obtained. I'll see if I can access the network
room, it's a building-provided service so that could be tricky.

Any clue about where to start looking?

Thanks.

J

John

I'm curious... did anyone screw around with the MAC address? Both PCs have
exactly the same MAC.

cameronjpu said:
I am an independent admin helping out a client of mine. They have a
network with only two computers, the router is outside the office (in
the basement). We have a switch inside the office. IP addresses are
manually assigned. Both computers have no firewall but the windows xp
firewall.

They share a folder that is hosted on one of the computers, and
everything has worked fine for a long time. Suddenly late last week,
the remote system could no longer access the host system's shared
files. Can't get to the workgroup even. The weirdest thing is that
neither computer can even ping the other, but the internet never
stopped working perfectly.

The two computers' ipconfig/all outputs are below:

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Susan Stolov>ipconfig/all

***************************************REMOTE
COMPUTER************************
Windows IP Configuration

Host Name . . . . . . . . . . . . : Station01
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/100 VE
Network Connecti
on
Physical Address. . . . . . . . . : 00-16-76-8A-37-EB
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 66.7.37.59
Subnet Mask . . . . . . . . . . . : 255.255.255.248
Default Gateway . . . . . . . . . : 66.7.37.57
DNS Servers . . . . . . . . . . . : 66.7.25.98
64.52.192.98

***************************************SERVER
COMPUTER************************

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Susan Stolov>ipconfig/all

Windows IP Configuration

Host Name . . . . . . . . . . . . : WIPMaster
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/100 VE
Network Connecti
on
Physical Address. . . . . . . . . : 00-16-76-8A-37-EB
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 66.7.37.60
Subnet Mask . . . . . . . . . . . : 255.255.255.248
Default Gateway . . . . . . . . . : 66.7.37.57
DNS Servers . . . . . . . . . . . : 66.7.25.98
64.52.192.98

C:\Documents and Settings\Susan Stolov>

Computers have been rebooted. Switch reset. Tried DHCP but IP
addresses could not be obtained. I'll see if I can access the network
room, it's a building-provided service so that could be tricky.

Any clue about where to start looking?

Thanks.

J

JohnB

Blocking ICMP on the .59 computer won't prevent that computer from pinging
the .60 computer, which is what he said is part of the problem. It is VERY
odd that both NICS show the same MAC address.

James W. Long said:
is there a firewall running on the 59 machine...?
{which may be blocking icmp echo request}
if so, that can be part of the problem.

James W. Long said:
James W. Long said:
do you see traffic on the icon in the tray?
gw is pingable, router is up. 60 is up. 59 no answer.

in this order:

are you SURE the 59 Machine is actually connected to the switch??
move the cable to a different port on the switch. they DO go bad.

check the cable- any heavy marks kinks etc which make it suspect?

got a spare known good cable ?

wouldnt hurt to do a repair on the connectoid in network (59) machine
(right click -> repair)
it will flush the dsn cache and reinit the connection assuming it can be.

might be a setting in the router has erroneously excluded the 59 machine
from access.
check this.

and if that doesnt work
delete the connectoid on the 59 machine
and make a new one. that will set all the data structures in the registry
straight again.

I am an independent admin helping out a client of mine. They have a
network with only two computers, the router is outside the office (in
the basement). We have a switch inside the office. IP addresses are
manually assigned. Both computers have no firewall but the windows xp
firewall.

They share a folder that is hosted on one of the computers, and
everything has worked fine for a long time. Suddenly late last week,
the remote system could no longer access the host system's shared
files. Can't get to the workgroup even. The weirdest thing is that
neither computer can even ping the other, but the internet never
stopped working perfectly.

The two computers' ipconfig/all outputs are below:

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Susan Stolov>ipconfig/all

***************************************REMOTE
COMPUTER************************
Windows IP Configuration

Host Name . . . . . . . . . . . . : Station01
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/100 VE
Network Connecti
on
Physical Address. . . . . . . . . : 00-16-76-8A-37-EB
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 66.7.37.59
Subnet Mask . . . . . . . . . . . : 255.255.255.248
Default Gateway . . . . . . . . . : 66.7.37.57
DNS Servers . . . . . . . . . . . : 66.7.25.98
64.52.192.98

***************************************SERVER
COMPUTER************************

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Susan Stolov>ipconfig/all

Windows IP Configuration

Host Name . . . . . . . . . . . . : WIPMaster
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/100 VE
Network Connecti
on
Physical Address. . . . . . . . . : 00-16-76-8A-37-EB
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 66.7.37.60
Subnet Mask . . . . . . . . . . . : 255.255.255.248
Default Gateway . . . . . . . . . : 66.7.37.57
DNS Servers . . . . . . . . . . . : 66.7.25.98
64.52.192.98

C:\Documents and Settings\Susan Stolov>

Computers have been rebooted. Switch reset. Tried DHCP but IP
addresses could not be obtained. I'll see if I can access the network
room, it's a building-provided service so that could be tricky.

Any clue about where to start looking?

Thanks.

P

PD43

James W. Long said:
is there a firewall running on the 59 machine...?
{which may be blocking icmp echo request}
if so, that can be part of the problem.

Try to get it all in the first post next time.

I know... it will be hard.

Try