Are you a network expert?? | Jan. 18, 2010

techgeek.in's Avatar, Join Date: Dec 2009
Skilled contributor
You're working the help desk and get a call that a user can't access the UNIX host at 150.150.32.157. You are on the same subnet as the user and the UNIX host, and try to ping the UNIX host. You can successfully do so. You can also ping the user's workstation. when you ask the user to enter ping 150.150.32.157, all they get is a series of Destination Unreachable messages. What is the problem? What should you do to solve the user's problem? (note:- the problem seems to be very funny..how such problem can exist? Everything seems to be correct but still the workstation cannot ping 150.150.32.157)
shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
Approved.
techgeek.in's Avatar, Join Date: Dec 2009
Skilled contributor
Make a small correctn..In the middle of the questn ip address is written 150.150.31.157..Actually it will be 150.150.32.157 throughout..The mistake is implicit i thnk..
shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
Corrected that
venami's Avatar, Join Date: Dec 2008
Ambitious contributor
The host 150.150.32.157 may be dropping all the ICMP requests from the machine from which you are ping-ing. To solve this problem, remove that firewall setting in the host so that your machine can ping the host.
neo_vi's Avatar, Join Date: Feb 2008
Invasive contributor
I think it is a gateway problem. The user's machine doesn't have the default gateway set in his PC. to resolve this add the default gateway. In GNU/Linux the command wil be
route add default gw <ip> <interface>
techgeek.in's Avatar, Join Date: Dec 2009
Skilled contributor
Quote:
Originally Posted by venami View Post
The host 150.150.32.157 may be dropping all the ICMP requests from the machine from which you are ping-ing. To solve this problem, remove that firewall setting in the host so that your machine can ping the host.

If the host is dropping the the ICMP packets then how the help desk is able to ping the host??
techgeek.in's Avatar, Join Date: Dec 2009
Skilled contributor
Quote:
Originally Posted by neo_vi View Post
I think it is a gateway problem. The user's machine doesn't have the default gateway set in his PC. to resolve this add the default gateway. In GNU/Linux the command wil be
route add default gw <ip> <interface>
If there is a gateway problem then how the help desk is getting reply from the workstation on ping-ing the workstation of the user??
techgeek.in's Avatar, Join Date: Dec 2009
Skilled contributor
Quote:
Originally Posted by neo_vi View Post
I think it is a gateway problem. The user's machine doesn't have the default gateway set in his PC. to resolve this add the default gateway. In GNU/Linux the command wil be
route add default gw <ip> <interface>
is there any concept of gateway in a subnet???
venami's Avatar, Join Date: Dec 2008
Ambitious contributor
Quote:
Originally Posted by techgeek.in View Post
If the host is dropping the the ICMP packets then how the help desk is able to ping the host??
We can drop all the ICMP requests that comes from a particular IP address using the firewall settings. So there is a possibility of the host dropping the ICMP requests from the pinging machine and responding to other machines.