1. A method comprising: outputting in a packet data network a first data packet from a network party towards a terminal; associating the first data packet with a time-to-live (TTL) adjusted to enable the first data packet to reach one or more intervening network entities but not to enable the first data packet to reach the terminal, in order to maintain traffic through the one or more intervening network entities to postpone expiry of a connection between the terminal and the network party in the one or more intervening network entities.