❦ 21 janvier 2020 23:51 +00, Tim Bray <tim@provu.co.uk>:
>> This setting is for the size of the route cache. You can have far more
>> routes. In the past, there were bugs where each lookup will be put in
>> cache, but since 4.2, only the PMTU exceptions are stored in cache. See
>> <https://vincent.bernat.ch/en/blog/2017-ipv6-route-lookup-linux#caching>
>>
>> Do you have a lot of entries in `ip -6 route show cache`?
>
>
> No entries at all in
> `ip -6 route show cache`
>
> and none in `ip -6 route show table cache`
>
> It is a quiet time of day, so I'll check again.
>
> What prompted me to look at net.ipv6.route.max_size was because I built my own newer kernel (in desperation).
>
> Linux version 5.4.11 (from kernel.org, .config from debian buster, make olddefconfig) gives out in dmesg:
>
> Route cache is full: consider increasing sysctl net.ipv[4|6].route.max_size.
>
>
> I've never seen this message on 4.19 Debian buster, but increasing
> net.ipv6.route.max_size made all the network hangs go away, both on
> 5.4.11 and 4.19
The message was addeed in 5.1. I'll test later today to check if "ip -6
route show cache" still works.
--
Parenthesise to avoid ambiguity.
- The Elements of Programming Style (Kernighan & Plauger)
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