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Ali Abbas » Linux Kernel Route Cache

To understand the importance of the routing cache, it is important to keep in mind and visualize the 3 main routing hash tables in use in the kernel for routing decisions… the Route Cache (what we will be discussing), the Route Policy Database and the Route Table. It is also in this order that the network subsystem queries the tables to make a forwarding decision. To display the “Route Cache”, one could simply issue the “ip route show cache” command.

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