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$ROS_IP and $ROS_HOSTNAME basically tell the nodes running on a computer on which address they are reachable from the outside. You need to set only one of those. Whatever works better in your network. (To be absolutely sure and if you can use static IPs, i prefer using IP addresses)
So make sure, that you can ping in both directions and set $ROS_IP on the server and the workstation each to their externally reachable addresses.
jbohren already mentioned what constellation can lead to the observed behaviour. rostopic list is completely independent from the setting of $ROS_IP. It only needs an correctly set $ROS_MASTER_URI. :)
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