| CPC H04L 63/20 (2013.01) [H04L 63/0272 (2013.01); H04L 63/1433 (2013.01)] | 20 Claims |

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1. One or more non-transitory computer-accessible storage media storing program instructions that when executed on or across one or more processors cause one or more computer systems to:
configure a plurality of security rule processing nodes for network traffic associated with a plurality of traffic sources and destinations;
transmit respective subsets of network configuration information associated with the plurality of traffic sources and destinations to individual ones of the security rule processing nodes, wherein the network configuration information includes a plurality of security rules; and
transmit respective addresses of at least a subset of the plurality of security rule processing nodes to a packet processing intermediary, wherein the packet processing intermediary is configured to request, with respect to individual packet flows, evaluation of applicable security rules by selected security rule processing nodes prior to initiating one or more routing actions for packets of the individual packet flows.
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