def addtunnel(self, remoteip, n1num, n2num, localnum):
        key = self.tunnelkey(n1num, n2num)
        if localnum == n2num:
            remotenum = n1num
        else:
            remotenum = n2num
        if key in self.tunnels.keys():
            self.session.warn("tunnel with key %s (%s-%s) already exists!" % \
                              (key, n1num, n2num))
        else:
            objid = key & ((1<<16)-1)
            self.session.info("Adding tunnel for %s-%s to %s with key %s" % \
                              (n1num, n2num, remoteip, key))
            if localnum in self.phys:
                # no bridge is needed on physical nodes; use the GreTap directly
                gt = GreTap(node=None, name=None, session=self.session,
                                remoteip=remoteip, key=key)
            else:
                gt = self.session.addobj(cls = GreTapBridge, objid = objid,
                                    policy="ACCEPT", remoteip=remoteip, key = key)
            gt.localnum = localnum
            gt.remotenum = remotenum
            self.tunnels[key] = gt
Add a new GreTapBridge between nodes on two different machines.
dataset/ETHPy150Open coreemu/core/daemon/core/broker.py/CoreBroker.addtunnel