CentOS disable IPv6 SLAAC EUI-64 Address Generation

While manually assigning a static IPv6 address on CentOS release 7.9.2009 works. I noticed that another (second) IPv6 address is being generated the so called EUI-64 containing ff::fe in the middle of the host part of the address. I want to remove it and leave only the manually assigned one, but unfortunately not able to. Currently under the interfaces i have the following parameters.

/etc/sysconfig/network-scripts/ifcfg-br0

and the interface looks like this:

DEVICE=br0
BOOTPROTO=static
NM_CONTROLLED=no
ONBOOT=yes
USERCTL=no

TYPE=Bridge
MACADDR=01:02:03:01:02:03
MTU=9000
    
IPADDR=MY_PUBLIC_IPV4
PREFIX=29
NETWORK=MY_PUBLIC_IPV4_NETWORK

DNS1=8.8.8.8
DNS2=8.8.4.4

IPV6INIT=yes
IPV6_AUTOCONF=no
DHCPV6C=no
IPV6ADDR=MY_GLOBAL_IPV6/48
IPV6_DEFAULTGW=MY_GLOBAL_IPV6_GATEWAY
IPV6_MTU=9000

ZONE=public

the interface itself is coming up and L2 and L3 networking is working fine for v4 and v6, but when i issue the command

ip addr show dev br0

I see not only the statically configured ipv6, but also a second ipv6 which is generated based on the EUI-64. I want to get rid of this second IPv6. How do i do that in CentOS?

I have also removed the dhcpv6-client service from all zones in order to see if that will changed anything but it did not .

firewall-cmd --zone=internal --remove-service=dhcpv6-client --permanent
firewall-cmd --zone=home --remove-service=dhcpv6-client --permanent
firewall-cmd --zone=public --remove-service=dhcpv6-client --permanent
firewall-cmd --zone=block --remove-service=dhcpv6-client --permanent
firewall-cmd --zone=dmz --remove-service=dhcpv6-client --permanent
firewall-cmd --zone=drop --remove-service=dhcpv6-client --permanent
firewall-cmd --zone=external --remove-service=dhcpv6-client --permanent
firewall-cmd --zone=trusted --remove-service=dhcpv6-client --permanent
firewall-cmd --zone=work --remove-service=dhcpv6-client --permanent

after that i reloaded the firewall just to be sure.

firewall-cmd --reload 

how to get rid of that EUI-64 address in CentOS/RHEL/FEDORA ?

Running:

Linux server 3.10.0-1160.6.1.el7.x86_64 #1 SMP Tue Nov 17 13:59:11 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

The IPv6 address in question i am trying to remove have scope: scope global mngtmpaddr dynamic i.e. we are not speaking about link local addresses here i.e. not fe80::

Solution 1:

In my case is not enough to put

IPV6_AUTOCONF=no 

under the interface config. It was required to put "IPV6_AUTOCONF=no" also in /etc/sysconfig/network

Then the SLAAC was disabled completely and with that also the EUI-64 address.