Strange lan access issues

[Alan87i]

I have 1 computer xp pro all updated with a weird problem.

It started a while back 1 month ago or so. I have several wireless radios in different locations all on the same lan. All use a browser port 80 to login and configure.

The radios have a .exe scan tool for locating them as well.

For some reason the tool would not locate any radio with an address above 192.168.0.132 But the same tool on the other computers in my home connected to the same switch would. My book marked link to these radios would bring up Page not found error.

I changed 1 radios IP using my laptop to .0.144 and the problem PC would see it for about 2 days. Now it doesn't again.

I also run a local server for a few games , Last night the problem PC would not list the server. But would list the internet servers. My wife 10 feet away was playing on the local server as well as 2 other members of this same lan. SO it seems to be getting worse.

I have tried shutting off windows fire wall.

Added a new nic card.

swapped switch ports and cables.

Ping is the same no reply to the affected Address's.

CC get mac address does not scan these address's either.

LM and hosts files seem normal.

I'm lost !

Thanks for any ideas.

Allan

[allen2]

Did you check the netmask (is it the same on the other computers ?)?

[Alan87i]

Did you check the netmask (is it the same on the other computers ?)?

Yes it's 255.255.255.0 every device is set the same.

[allen2]

Could you try the following :

- open a dos box, ping an ip (one not working)

- type arp -a

- then check if the output of arp -a contains the offending ip.

Even if there is a firewall, it should show the remote ip and mac address of the remote computer. If it is a sofware issue, then a "route print" might help.

The only other test i see, would be swap ethernet cable with one of the working computer and test on both if the problem moved.

[Alan87i]

Hear is the out put of the ping and arp -a commands route print is at the bottom. It shows 3 nics I put in a server nic I had the other day to test and haven't removed it yet.

I have this computer on a different cable now. I roll my own patch cables. This one was just used to setup a wireless AP with my laptop.

Below the IP 192.168.0.132 is 1 of the radios I can connect too , It's the AP that the radio that failed to connect is associated with.

What is been bugging me is Radio IP .0.136 's route for me to connect too it is my pc/ switch/ 5.8ghz wireless bridge /switch/2.4 ghz wireless bridge/900 Mhz AP/192.168.0.136 radio.

the second radio in the 2.4Ghz hop I can't ping either. It's as if something is blocking local connections By IP.

G:\Documents and Settings\Allan>ping 192.168.0.136

Pinging 192.168.0.136 with 32 bytes of data:

Request timed out.

Request timed out.

Request timed out.

Request timed out.

Ping statistics for 192.168.0.136:

Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

G:\Documents and Settings\Allan>arp -a

Interface: 192.168.0.101 --- 0x10005

Internet Address Physical Address Type

192.168.0.25 00-04-23-ce-ce-fa dynamic

192.168.0.30 00-22-15-d1-c8-a9 dynamic

192.168.0.132 00-60-b3-3f-86-5d dynamic

G:\Documents and Settings\Allan>route print

===========================================================================

Interface List

0x1 ........................... MS TCP Loopback interface

0x10003 ...00 04 23 a6 4a 94 ...... Intel® PRO/1000 MT Dual Port Server Adapte

r

0x10004 ...00 04 23 a6 4a 95 ...... Intel® PRO/1000 MT Dual Port Server Adapte

r #2

0x10005 ...00 23 54 d5 c3 91 ...... Realtek RTL8168C(P)/8111C(P) PCI-E Gigabit E

thernet NIC

===========================================================================

===========================================================================

Active Routes:

Network Destination Netmask Gateway Interface Metric

0.0.0.0 0.0.0.0 192.168.0.25 192.168.0.101 10

127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1

169.254.0.0 255.255.0.0 192.168.0.101 192.168.0.101 20

192.168.0.0 255.255.255.0 192.168.0.101 192.168.0.101 10

192.168.0.101 255.255.255.255 127.0.0.1 127.0.0.1 10

192.168.0.255 255.255.255.255 192.168.0.101 192.168.0.101 10

224.0.0.0 240.0.0.0 192.168.0.101 192.168.0.101 10

255.255.255.255 255.255.255.255 192.168.0.101 10003 1

255.255.255.255 255.255.255.255 192.168.0.101 192.168.0.101 1

255.255.255.255 255.255.255.255 192.168.0.101 10004 1

Default Gateway: 192.168.0.25

===========================================================================

Persistent Routes:

None

[Alan87i]

Using another PC I changed several IP address's on the AP's and client radios I have problems accessing.

I then can access them from my problem XP machine. Until I restart the computer. Then it's back to can't ping or access them.

[allen2]

The problem seems to come from the 2.4Ghz wireless bridge as you can't ping it either when you have the problem or the switch before. I'll check both of them and try to replace one of them with a cable when the problem occur to be sure to find the faulting component.

It seems one of those blacklist your comp after a reboot, perhaps due to a bad packet sent.

I'll also try to active XP firewall and/or disable the interface and then reboot then active the interface and try again.

I would also remove/disable all unused network adapter as they might ask for an ip address and getting denied.

So i would set a static IP/dns on the used network adapter and disable dhcp service (just to be sure).

[Alan87i]

The problem seems to come from the 2.4Ghz wireless bridge as you can't ping it either when you have the problem or the switch before. I'll check both of them and try to replace one of them with a cable when the problem occur to be sure to find the faulting component.

It seems one of those blacklist your comp after a reboot, perhaps due to a bad packet sent.

I'll also try to active XP firewall and/or disable the interface and then reboot then active the interface and try again.

I would also remove/disable all unused network adapter as they might ask for an ip address and getting denied.

So i would set a static IP/dns on the used network adapter and disable dhcp service (just to be sure).

The radios are fine 5 other pc's here can access each one and both bridges have 6 or more PC's behind them accessing the internet. It's just this one and only one XP box with problems.

I'll try your ideas and get back to you.