A method of maintaining data packet forwarding information in a first network node of a wireless mesh communications network having a plurality of network nodes interconnected by wireless communications links is disclosed. The method includes receiving respective activity indicators for neighbour network nodes connected with the first network node by respective wireless communications links, and determining respective link indicators for the outgoing wireless communications links of the first network node, each such link indicator being indicative of a data packet transmission characteristic for the link concerned. The method further includes, for each of the outgoing communications links of the first network node, combining the link indicator associated with that outgoing wireless communications link with the activity indicator relating to the neighbour network node connected with the first network node via that outgoing wireless communications link, thereby to generate a routing value for the outgoing wireless communications link for the destination network node. A selected next communications link for the destination network node is determined from the generated routing values; and is then stored as forwarding information relating to the selected next communications link for the destination network node concerned.