On 09/25/2018 03:17 AM, Pepe Charli wrote: > Hi, > > In "5.1.11.1 Release Notes" said: > > "4) Now that the route caches have been removed from the kernel, ......" > > What does this mean? >
Originally, the IPv4 stack would cache the result of a route lookup in a hash table such that subsequent packets belonging to the same flow could be routed based on a simple cache lookup. The cache was removed from the IPv4 stack in kernel version 3.6. The IPv6 stack still uses a form of caching, but keeps the cached entries in the same tree structure used to store the IPv6 routing table. Beginning with kernel version 4.2, only routes with PMTU exceptions are cached, which means that the vast majority of lookup results are not cached (see https://vincent.bernat.ch/en/blog/2017-ipv6-route-lookup-linux). You can see such cached routes using the command 'ip route ls table cache'. -Tom -- Tom Eastep \ Q: What do you get when you cross a mobster with Shoreline, \ an international standard? Washington, USA \ A: Someone who makes you an offer you can't http://shorewall.org \ understand \_______________________________________________
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