Disable stateless ipv6 address generation

[romikb]

I try to setup ip for server using /etc/conf.d/net.eth0

template="interface"
ipaddr="192.168.11.6/24 2a03:xxxx:xxxx:xxxx::6/64"
gateway="192.168.11.1"
gateway6="2a03:xxxx:xxxx:xxxx::"

but interface acquire 3 ipv6 addresses

# ifconfig eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.11.6  netmask 255.255.255.0  broadcast 192.168.11.255
        inet6 2a03:xxxx:xxxx:xxxx:aaaa:aaaa:aaaa:aaaa  prefixlen 64  scopeid 0x0<global>
        inet6 2a03:xxxx:xxxx:xxxx::6  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::aaaa:aaaa:aaaa:aaaa  prefixlen 64  scopeid 0x20<link>
        ether aa:aa:aa:aa:aa:aa  txqueuelen 1000  (Ethernet)
        RX packets 3448832  bytes 2497999401 (2.3 GiB)
        RX errors 0  dropped 222  overruns 0  frame 0
        TX packets 4594668  bytes 5355598657 (4.9 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

how can I exclude "2a03:xxxx:xxxx:xxxx:aaaa:aaaa:aaaa:aaaa"?

 

PS: neighbor discovery is enable on router and cannot be disabled because needed by other pc. 

[palica]

try

sysctl net.ipv6.conf.eth0.autoconf=0
sysctl net.ipv6.conf.eth0.accept_ra=0