This may be use/interest/of relevance to some of the list doing v6 and
using linux for some of their infrastructure.
Apologies if not :)
Chris
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of bert
hubert
Sent: 27 February 2014 19:40
To: [email protected]
Subject: [Pdns-users] Heads up Linux IPv6 users: larger scale use may
require kernel tuning
Hi everybody,
More and more deployments are switching on IPv6, some of them are even
'switching over', by giving mobile devices only an IPv6 address and
utilizing DNS64/NAT64 to make this work for IPv4 legacy services. We
describe this on
http://blog.powerdns.com/2013/05/17/ripe-66-powerdns-and-dns64nat64/
However, today we had a Linux user run into problems with their large
IPv6 deployment. The root cause turned to be in the Linux kernel.
If you are doing larger scale IPv6 on Linux, check:
$ sysctl net.ipv6.route.max_size
The kernel-level default is 4096. If you have more IPv6 users than this
active simultaneously, things will slow down to a crawl. Today we raised
the value to 16384, but far higher values are probably safe too and may
be required.
We're discussing this the the relevant Linux kernel people here
http://marc.info/?l=linux-netdev&m=139352943109400&w=2 but for now,
things need to be set manually.
Good luck with your IPv6 deployments!
Bert
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