Problem with Ping

[Stephen Simpson]

Greetings,

We have a 20 workstation network. All the workstations are win2k pro
machines and the server is a win2k server with active directory, dns and
dhcp loaded.

The workstations are all cabled to a switch.

Here is the issue.

1) On a 'working' workstation I can ping all the other workstations (by ip)
except the 'broken' one.

2) On the 'broken' workstation I can ping (by ip) the server, the firewall,
two other computers.
3) The 'broken' computer can ping its own IP address (90.0.0.61) and
127.0.0.1
4) The 'broken' computer can get on the internet through the gateway.
5) The 'broken' computer can login to the domain and map network drives

However, the 'broken' computer cannot ping certain of the network resources
(several workstations and a printer; all of which can be pinged from the
'working' workstations). This is the problem I am trying to fix.

The various computers are all cabled to the same switch. The cabling has
tested successfully and all other network devices work as expected.

I have reinstalled TCP/IP on the workstation, tried different static ip
addresses (in the correct subnet), tried different ports on the switch,
different patch cables, etc.

In short, this workstation can connect to the servers, the internet but
cannot ping a selection of resources. The cabling is fine.

Questions:

1) Any ideas?
2) Could the problem be in the switch.
2) Could this have anything to do with the active directory on the server

We have spent several hours trying various things and have done several web
searches on this topic and have not made progress

Thanks,

Stephen Simpson

 

[Jetro]

The network is misconfigured. You cannot expect AD would work properly using
public IP address space (90.x.x.x). Reconfigure DHCP with any scope from
private IP address space, give the server a static IP address from the same
space, adjust DNS server, and configure the workstations to obtain an IP
address automatically. When you get stable working AD and local network,
reconfigure the router/firewall.
If you got the public IPs from your ISP, reconsider their necessity.

 

[Gerry Voras]

Incorrect subnet mask on the "broken" workstation, or else an incopmpletely
flushed mac buffer on the switch.