** Changed in: linux (Ubuntu)
Importance: Undecided => Wishlist
** Also affects: linux (Ubuntu Bionic)
Importance: Wishlist
Status: Confirmed
** Changed in: linux (Ubuntu Bionic)
Status: Confirmed => Triaged
** Tags added: bionic kernel-da-key
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https://bugs.launchpad.net/bugs/1728366
Title:
Enable CONFIG_IPV6_OPTIMISTIC_DAD
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Bionic:
Triaged
Bug description:
Feature request: Please enable CONFIG_IPV6_OPTIMISTIC_DAD.
config IPV6_OPTIMISTIC_DAD
bool "IPv6: Enable RFC 4429 Optimistic DAD"
---help---
This is experimental support for optimistic Duplicate
Address Detection. It allows for autoconfigured addresses
to be used more quickly.
If unsure, say N.
It's no longer marked EXPERIMENTAL, but as you can see the description
still calls it "experimental". I don't know its real status.
<https://tools.ietf.org/html/rfc4429>
It might make booting faster and/or more reliable, depending on how
init handles waiting for DAD before starting services. I haven't
actually used it, and don't know if it really will help anything.
This was previously requested as part of bug #447905, which went
nowhere and was automatically closed in 2010. (That bug also requested
a second, seemingly unrelated feature which is now enabled.)
I want it for the amd64 virtual and ec2 kernels in Xenial and Bionic,
but I can wait until next decade too.
The relevant sysctls remain off by default, keeping the risk low for
users who don't choose to enable it. (I think.)
Backporting 35e015e1f5773417952fe91ce8790baf9b4237a2 from 4.14-rc2
would be necessary for the net.ipv6.conf.all.optimistic_dad sysctl to
work, but net.ipv6.conf.eth0.optimistic_dad and so forth should work
without it. (I think...)
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