Had two of the same IP's, how do I clear the damage?

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Hi All,

I set up an OpenVPN tunnel between two sites. I goofed
and had the same IP address (192.168.255.100) on each end.
I have corrected the problem.

Problem: every machine on the network works fine with the
new IP addresses (192.168.255.100-local, & 101-remote),
except the original machine (192.168.255.50) I was doing
the testing on. It can not see the 192.168.255.101 at
the remote location. (Everyone else can, but not .50)

Is it possible that its routing tables are messed up?
How do I do a mass clear and start over? How do I
clear the damage?

Many thanks,
-T
.