Re: How to solve race condition between IPv6 ifup and start of services?
On Sat, 21 May 2011 14:31:45 +0100, Ben Hutchings
<ben@decadent.org.uk> wrote:
>On Sat, 2011-05-21 at 15:01 +0200, Marc Haber wrote:
>> with the increasing deployment of IPv6 I begin to see an issue
>> icreasingly often: When an interface is configured for IPv6, it takes
>> a few seconds before the IPv6 address actually becomes available.
>> Services that are started in this time window won't listen on IPv6,
>> which may be unintended behavior. Many people see this behavior as a
>> bug in the distribution, which is why I am addressing this issue here
>> on -devel.
>>
>> Unfortunately, it is non-trivial to find out whether my IPv6
>> configuration has completed or not. How many addresses will be
>> assigned to us via stateless autoconfig? Are we running with privacy
>> extensions? Do we have additional static configuration?
>>
>> The most "clean" solutions for this issue would be
>> (a) Modify the services to notice when additional IP addresses come up
>> and listen there if the service is configured for that IP address
>> (b) Parse the configuration of each service in the init script and
>> wait for the configured IP addresses to actually come up.
>[...]
>
>(c) Set the IP_FREEBIND socket option before binding.
What does this do? And it needs changes to the software as well.
Greetings
Marc
--
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Marc Haber | " Questions are the | Mailadresse im Header
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