Tracing is the easy way for any Networking Team to solve some Connectivity problems.
Goto Start--> run-->type cmd
in the command prompt  TYPE Tracert(this is a file in the system folder)
Wht Tracert does is it sends packages to the specified IP over different Intermediate locations hopping.U can find out where the ip is not getting pinged seeing the Trace file log.
sample Trace output
C:\Documents and Settings\guru>tracert yahoo.com
Tracing route to yahoo.com [66.94.234.13]
over a maximum of 30 hops:
  1    <1 ms    <1 ms    <1 ms  10.114.64.254
  2    <1 ms    <1 ms    <1 ms  10.114.45.187
  3    <1 ms    <1 ms    <1 ms  10.114.45.254
  4     1 ms     1 ms     1 ms  10.255.255.45
  5    38 ms    37 ms    38 ms  10.255.255.6
  6    38 ms    38 ms    39 ms  10.13.0.2
  7    38 ms    37 ms    38 ms  10.13.0.250
  8    38 ms    38 ms    38 ms  10.13.0.2
  9    38 ms    38 ms    38 ms  10.13.0.250
 10    38 ms    38 ms    39 ms  10.13.0.2
 11    39 ms    39 ms    40 ms  10.13.0.250
 12    39 ms    38 ms    39 ms  10.13.0.2
 13    38 ms    38 ms    39 ms  10.13.0.250
 14    41 ms    38 ms    38 ms  10.13.0.2
 15    38 ms    40 ms    38 ms  10.13.0.250
 16    39 ms    40 ms    39 ms  10.13.0.2
 17    42 ms    39 ms    38 ms  10.13.0.250
 18    39 ms    38 ms    39 ms  10.13.0.2
 19    40 ms    40 ms    40 ms  10.13.0.250
 20    38 ms    38 ms    39 ms  10.13.0.2
 21    39 ms    40 ms    40 ms  10.13.0.250
 22    40 ms    39 ms    40 ms  10.13.0.2
 23    40 ms    40 ms    40 ms  10.13.0.250
 24    40 ms    40 ms    41 ms  10.13.0.2
 25    40 ms    40 ms    39 ms  10.13.0.250
 26    40 ms    43 ms    39 ms  10.13.0.2
 27    42 ms    40 ms    40 ms  10.13.0.250
 28    39 ms    40 ms    39 ms  10.13.0.2
 29    41 ms    40 ms    40 ms  10.13.0.250
 30    45 ms    40 ms    40 ms  10.13.0.2
Trace complete.
for all those who dont know u can find a machines Mac address also by giving this in the command prompt  
nbtstat -a (GIVE IP HERE)    all the fellow pros here who use IP rotators or proxy can be easily caught which they think is not possible lol 
 
  
  since u cannot change ur mac address.......
Happy Gaming .....