On Sat, May 21, 2011 at 03:01:39PM +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. > Both solutions are rather expensive to implement. > Is there a widely accepted method to do things any easier? It is > clearly not acceptable to have to manually log in to a newly booted > server to restart service, neither do I like the idea of changing > runlevels five minutes after reboot to kick IPv6 services to life. > Any more ideas? With an event-based init system such as upstart, you could also set up the service not to start until the specified interface is fully configured. But in general, I agree that upstream software should be intelligent about doing the right thing when started before the network is up. Apache, for one, seems to fail at this currently; I have an apache instance running on my laptop which I want to bind to ipv6, but of course since it's a roaming laptop, there isn't always an ipv6 address available at startup; apache thinks this means it should open ipv4-only sockets, requiring a restart once I'm on an ipv6 network. :/ -- Steve Langasek Give me a lever long enough and a Free OS Debian Developer to set it on, and I can move the world. Ubuntu Developer http://www.debian.org/ slanga...@ubuntu.com vor...@debian.org -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20110521224251.gb29...@virgil.dodds.net
