The parameter either6 is introduced to dracut by
commit 67354eebbcd4c358b8194ba5fd1ab1cf7dbd42aa
Author: Pingfan Liu <piliu@redhat.com>
Date: Tue Apr 24 16:41:21 2018 +0800
40network: introduce ip=either6 option
But it turns out needless.
On a sensible ipv6 network environment, DHCPv6 can not work properly alone,
because DHCPv6 protocol has no info about the gateway.
An reasonalbe process of ipv6 address set up should look like
host send: Router Solicitation
router reply: Router Advertisements
"Router Advertisements" carries many info like gateway, and if it has
other-config flag set, it carries DNS info etc. As for DHCPv6 address
allocation, it will only start if "Router Advertisements" has the 'managed'
flag set, which directs the host to start a stateful address allocation
from DHCPv6 server.
For more info:
rfc4861: Neighbor Discovery for IP version 6 (IPv6)
rfc5175: IPv6 Router Advertisement Flags Option
Signed-off-by: Pingfan Liu <piliu@redhat.com>
Acked-by: Kairui Song <kasong@redhat.com>
Adding a patch to kexec-tools
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