Cannot access IP address from another subnet

[Javier Sheh]

Hello,

I have 3 PC's in 3 different subnets in my intranet.  PC A has IP address 
135.21.42.108, PC B has IP address 135.16.102.30, PC C has IP address 
135.91.108.36.  I loaded RealVNC Free Edition 4.1.1 server on B.  I loaded 
RealVNC Free Edition 4.1.1 client on A.  No RealVNC was on C.  Before 
loading RealVNC, I was able to ping from A to B and from C to B.  I 
established RealVNC connection from A to B.  After this, I tried pinging 
from C to B, but could not get response from B.  C could ping anything on 
B's subnet (e.g. 135.16.102.50, 135.16.102.1) except B itself.  I rebooted 
PC A and PC B, but still could not get to PC B through C.  I tried another 
PC on subnet same as C and could not ping PC B either.  Is RealVNC 
establishing some kind of pipe that prevents other subnets from accessing a 
specific server address?  What can be done to clear this problem?  Is there 
some kind of option I am overlooking?  Am I closing the connection 
improperly?

I have noticed this with two other IP addresses that I used RealVNC with.  
These IP addresses cannot be pinged from a foreign subnet.

Thanks,
Javier

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