A method, in a node of a network, of establishing a transport layer connection with another node of the network. The method comprises: sending, by the node, a first permanent identifier of the transport layer connection to the other node, the first permanent identifier being independent of at least an IP-address of the node; receiving, by the node, a second permanent identifier of the transport layer connection from the other node, the second permanent identifier being independent of at least an IP-address of the other node; and associating, by the node, the first and second permanent identifiers with a transport layer identifier of the transport layer connection.