Cisco IOS URL Filtering can act as a backup or as a failover mechanism if the third-party URL filtering server is unavailable or unreachable. A third-party URL filtering server such as Websense or N2H2 is present at the headquarters location. Each branch office points to this server at the headquarters for its URL filtering needs. The requests can be cached at the branch itself using Cisco IOS URL Filtering. Additionally, if the URL filtering server is unreachable, the Cisco IOS URL Filtering static list will act as a backup filtering mechanism, as shown in Figure 2 above.
For larger branch and regional offices that need to offload URL filtering and caching to an external module, a network module is available for Cisco 2800 and 3800 Series routers
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...