Cannot access IP address from another subnet

[Javier Sheh]

All PCs are running Windows 2000.  I found out that PC B that has the Server 
was running 3.3.3 R9 while the Client in PC A was running 4.1.1.  Could this 
cause such a problem?  I re-installed the software on both PC A and B to 
4.1.2 but still have the same problem with the IP addresses.


>From: Seak <lapidis666-vnc "at" yahoo.com>
>To: vnc-list "at" realvnc.com
>Subject: Re: Cannot access IP address from another subnet
>Date: Mon, 22 Jan 2007 19:00:31 +0100
>
>     This is very very odd.  What O/S is in your PC B?  Beside PC C can't
>ping PC B, can PC C open a VNC connection to PC B (normally the answer
>should be No)?
>
>     Have you triggered some firewall by mistake in PC B?
>
>Javier Sheh wrote:
> > 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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