It is generally accepted that survivable networks tend to consist of network elements (nodes and links) where no individual element is significantly more important than any other element. Using a traffic based network survivability metric Si, which quantifies the impact of removing network element i from a network of N elements, this paper investigates the modification of link capacities to simultaneously maximise average network survivability (1/N/spl Sigma//sub i=1//sup N/S/sub i/) and minimise the variability of Si (var(Si)). For some networks there appears to be an unique optimal set of link capacities however, for others, a number of possible optima exist. For these networks a Pareto-optimal set was generated so that a decision could be made on which link enhancements should be performed. The change in optima as a consequence of changes in the budget for link enhancements and also in changes in the required network traffic load were also investigated.