How to check whether linux supports ipv6

Two viewing methods: 1. Execute the "ifconfig" command to display the IP address and check the output information. If "inet6" information is included, it indicates that ipv6 is supported. 2. Execute the "netstat -tuln" command to detect the service monitoring IP, if the output result contains "tcp6" information, it means ipv6 is supported.

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

Check whether the linux server supports ipv6

Method 1: Use the ifconfig command to check whether your IP address contains an IPv6 address

If the output result contains "inet6", it means that ipv6 is supported. If ipv6 is not supported, the output result will not contain "inet6".

Method 2: Use the netstat -tuln command to check whether there is an address in IPv6 format among the IPs monitored by the service.

If the output result contains "tcp6" information, it means ipv6 is supported.

Extended knowledge: How to enable IPV6

1. vim /etc/sysctl.conf

Modify the following values is 0, if not, just add it

net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.default.disable_ipv6= 0
net.ipv6.conf .lo.disable_ipv6 = 0

2, vim /etc/modprobe.d/disable_ipv6.conf

Change the following value to 0, otherwise Just add

options ipv6 disable= 0

3. vim /etc/sysconfig/network

Change the following Modify the value yes, if not, just add it

NETWORKING IPV6=yes

At this point, the server-side support for ipv6 has been modified

4. Restart the server to test whether it supports ipv6

Restart command:

service network restart

After restarting, ifconfig checks the ipv6 information and sees about The output of ipv6 is fine.

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