Connecting two remote networks over internet

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There are some possibilities to do this (like ipsec tunnels fi, or SSH tunneling), but success of any approach will depend on what kinds of traffic the firewalls on both university networks will allow. Using a third party 'in the middle' might make things easier, as all connections will be considered outgoing by both university networks then (no need to 'open up ports' for a server at one of the ends).

After setting up the actual connection, it might make sense to look into a multi-master setup in combination with throttling of some of the more 'verbose' topics (such as tf). Most of the times this is taken care of by the multi-master system though.