The disclosure herein is directed to a method in a mobility management node (MME1) and a mobility management node (MME1) for executing the method of selecting a network access gateway node (PGW1, PGW2, PGW3) when establishing a PDN connection for a radio terminal (UE) to a PDN (400) identified by an APN (APN1) which mobility management node is configured to operatively manage the mobility for the radio terminal and which access gateway node is configured to operatively act as a network access gateway to the PDN so as to provide connectivity for the radio terminal to the PDN, the method comprises: receiving (401), from a number of network access gateway nodes (PGW1, PGW2, PGW3), APN capacity allocation information indicating the APN capacity that each access gateway node has allocated to serve the APN, and APN load information indicating the APN load that each access gateway currently experience with respect to the APN, receiving (402), from a Domain Name Server (DNS1), weight factor information indicating the relative amount at which each access gateway node should be selected when a PDN connection is created, and selecting (403) a network access gateway node among said number of network access gateways based on the APN capacity allocation information and the APN load information and the weight factor information.