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dracut-module-setup.sh: use auto6 for ipv6 

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>
This commit is contained in:
Pingfan Liu 2020-12-07 12:53:47 +08:00 committed by Kairui Song
parent d5e39c9f7b
commit eaf0e813a2
1 changed files with 1 additions and 1 deletions
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2
dracut-module-setup.sh
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@ -373,7 +373,7 @@ kdump_install_net() {
if [ -n "$_static" ]; then
_proto=none
elif is_ipv6_address $_srcaddr; then
_proto=either6
_proto=auto6
else
_proto=dhcp
fi