Messages in this thread |  | | | Date | Fri, 25 May 2012 20:11:50 -0400 (EDT) | | Subject | Re: [PATCH] net: compute a more reasonable default ip6_rt_max_size | | From | David Miller <> |
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From: Arun Sharma <asharma@fb.com> Date: Fri, 25 May 2012 17:08:59 -0700
> On 5/25/12 3:51 PM, David Miller wrote: >> From: Arun Sharma<asharma@fb.com> >> Date: Fri, 25 May 2012 15:22:54 -0700 >> >>> On 5/25/12 1:47 PM, Eric Dumazet wrote: >>>> On Fri, 2012-05-25 at 13:15 -0700, Arun Sharma wrote: >>>>> The algorithm is based on ipv4 and alloc_large_system_hash(). >>>>> >>>> >>>> Why is it needed at all ? >>>> >>>> IPv4 has a route cache with potentially millions of entries, not IPv6. >>> >>> With the default size of 4096 for the ipv6 routing table, entries can >>> get garbage collected and hosts could lose their default route and >>> therefore lose connectivity. >>> >>> We actually saw it happen. >> >> Under no circumstances should administrator configured ipv6 routes be >> garbage collected, that is a bug. > > These were not admin configured routes. They were discovered via ipv6 > neighbor discovery.
Then such default routes should either be:
1) Passed over by GC
2) Trigger neighbour discovery when GC'd
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