Hi,
I just configured a dedicated server in a proxmox environment. I successfully configured the network following the provider’s guideline and actually didn’t considered anything ipv6 related.
I just noticed that postfix tried to connect to some smtp servers using their ipv6 adresse and got a “network unreachable” message.
What can I do to disable ipv6 (to begin with) ?
Thanks
Matthieu
EDIT : some output from configuration :
[root@cloud ~]# ifconfig -a
ens19 (GREEN): flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.10.10.1 netmask 255.255.255.0 broadcast 10.10.10.255
inet6 fe80::7c32:79ff:fedb:3c1e prefixlen 64 scopeid 0x20<link>
ether 7e:32:79:db:3c:1e txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 13 bytes 978 (978.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0 (RED): flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet *.*.*.* netmask 255.255.255.255 broadcast *.*.*.*
inet6 fe80::ff:*:* prefixlen 64 scopeid 0x20<link>
ether 02:00:00:36:58:0f txqueuelen 1000 (Ethernet)
RX packets 9683883 bytes 2065832230 (1.9 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 9027015 bytes 23400499232 (21.7 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@cloud ~]# ip -6 route
unreachable ::/96 dev lo metric 1024 error -113 pref medium
unreachable ::ffff:0.0.0.0/96 dev lo metric 1024 error -113 pref medium
2001:41d0:*:*::/56 dev eth0 proto kernel metric 256 expires 2505020sec pref medium
unreachable 2002:a00::/24 dev lo metric 1024 error -113 pref medium
unreachable 2002:7f00::/24 dev lo metric 1024 error -113 pref medium
unreachable 2002:a9fe::/32 dev lo metric 1024 error -113 pref medium
unreachable 2002:ac10::/28 dev lo metric 1024 error -113 pref medium
unreachable 2002:c0a8::/32 dev lo metric 1024 error -113 pref medium
unreachable 2002:e000::/19 dev lo metric 1024 error -113 pref medium
unreachable 3ffe:ffff::/32 dev lo metric 1024 error -113 pref medium
fe80::/64 dev ens19 proto kernel metric 256 pref medium
fe80::/64 dev eth0 proto kernel metric 256 pref medium
fe80::/64 dev tunbrass proto kernel metric 256 pref medium
fe80::/64 dev tunrw proto kernel metric 256 pref medium
[root@cloud ~]# cat /etc/sysconfig/network
# ================= DO NOT MODIFY THIS FILE =================
#
# Manual changes will be lost when this file is regenerated.
#
# Please read the developer's guide, which is available
# at NethServer official site: https://www.nethserver.org
#
#
NETWORKING=yes
FORWARD_IPV4=yes