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 .....