problem with rexec

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Hi All,

I have two linux machines running CentOS 4.3 with kernel version
2.6.9-34.0.2EL. Each of the machines have two interfaces. One
interface is 1000 mbps and while the other one is 100mbps. I have
connected the 100mbps interface of both the machines to my network
switch and assigned them static public IP addresses given to me by the
network admin. I have connected the 1000mbps interfaces of both
machines together using a cross over cable and assigned the interfaces
private IPs namely 192.168.1.2 and 192.168.1.3. I have stopped the
firewall running at both the machines and allows all kinds of traffic.
I have installed the rsh-server package on both the machines and
enabled services like rsh, rlogin, rexec. I know about the
vulnerabilities of doing so and disabling the firewall. This is just a
test setup. I verified that the two machines can communicate using
both the 100mbps interfaces as well as the private ip addresses. I can
do rlogin/rsh/rexec between the two machines if i use the 100mbps
interfaces. I can also do rlogin/rsh between the two machines using
the private IP addresses (i.e. 1000mbps interfaces). However when i
try to rexec between the private IP addresses, i get an error that
"Where are you?" and connection lost. Why is it that i can do rexec
between the two machines using the 100mbps interfaces with static
public IP addresses but cannot do so using the private IP addresses.
Other services have no problem with this. I request if somebody can
help me out with this.

Thanks in advance.
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