Ping Over Office Network

[Guest]

hi there,

i have a home XP Pro PC connected to the internet with only an ADSL modem.
i am having problem to ping my home PC knowing the IP. i can surf internet
at my office through my office network by setting a proxy in the Internet
Connection setting.

however, i can't ping any IP from my office. here is an example of a ping
result.

C:\>ping yahoo.com

Pinging yahoo.com [66.94.231.99] with 32 bytes of data:

Reply from 10.50.18.1: Destination net unreachable.
Reply from 10.50.18.1: Destination net unreachable.
Reply from 10.50.18.1: Destination net unreachable.
Reply from 10.50.18.1: Destination net unreachable.

Ping statistics for 66.94.231.99:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms

where 10.50.18.1 is my office Default Gateway. somehow it can find the
yahoo.com IP but cannot communicated properly. any idea what will be the
problem behind this? all my LAN connection setting is AUTO. no DNS entry.
only the Default Gateway IP is setup.

your help will be very much appreciated.

 

[David Dickinson]

Your firewall is probably blocking both pings and echos.

In addition, (if I understood you correctly) if your home PC has a private
IP address (in the range 192.168.x.x, 10.x.x.x, or 172.16.x.x through
172.31.x.x, where 0 < x < 255) then you cannot ping it from the Internet;
your ADSL router is using Network Address Translation (NAT) to translate IP
addresses between your private (LAN) network and the public (Internet)
network. Those "private" IP addresses cannot be pinged from public
networks. And if you /do/ get a response when you ping an address (such as
10.50.18.1) at your office then you are actually getting an echo from a
machine on the office's LAN.

You could, however, ping the ADSL modem's public IP address if the firewall
for the system from which you want to ping allows it.

 

[David Dickinson]

I think you are correct: If I understand you correctly, you can ping your
home PC from another PC on the internet, but not from your office PC.
However, it is difficult for me to understand why you don't have a firewall
for both PCs. While your home computer would be somewhat protected by the
DSL modem if you were using its NAT capabilities, it is vital that your
office network be protected. One machine can serve as a gateway/firewall
for internet connections from the office LAN. If you have a DSL connection,
a good DSL modem can provide both services.

I will be surprised if you actually have no firewall protection. And, as I
said, I would suspect that the firewall is blocking the pings.

More information about your office's network configuration will help.

 

[Guest]

david, anymore idea how can i go about my office network so that i can ping
and connect to my home pc?

anyone can help?

appreciate that.

thank you.