添加ipv6以读取Hat 9回送接口

Question

在新创建的rhel9 VM中，环回接口不包括IPv6地址，但/etc/hosts包含用于本地主机的::1条目

[vagrant@el9-test-fd5843e6 ~]$ ip a
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: eth0:  mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:02:41:69 brd ff:ff:ff:ff:ff:ff
    altname enp0s3
    inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic noprefixroute eth0
       valid_lft 85325sec preferred_lft 85325sec
    inet6 fe80::a00:27ff:fe02:4169/64 scope link noprefixroute
       valid_lft forever preferred_lft forever

[vagrant@el9-test-fd5843e6 ~]$ cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

127.0.0.1 rhel9.localdomain

如何配置环回接口的IPv6地址？为便于参考，我使用下面的迷航框https://app.vagrantup.com/generic/boxes/rhel9对此进行测试

Answer 1

这与RHEL 9无关。您使用的是显式禁用的IPv6；查看一下/etc/sysctl.conf：

[root@node1 sysctl.d]# cat /etc/sysctl.conf
# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).


net.ipv6.conf.all.disable_ipv6 = 1

删除或注释掉该行并重新启动(或只运行sysctl -w net.ipv6.conf.all.disable_ipv6=0)，您就应该都设置好了。只要更改sysctl，就会产生以下结果：

[root@node1 sysctl.d]# ip -6 addr
1: lo:  mtu 65536 state UNKNOWN qlen 1000
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0:  mtu 1500 state UP qlen 1000
    inet6 fe80::5054:ff:fe62:ca84/64 scope link
       valid_lft forever preferred_lft forever