To enable the IPV6 run:

sysctl net.ipv6.conf.all.disable_ipv6=0

To disable it , run:

sysctl net.ipv6.conf.all.disable_ipv6=1

To check for IPv6 support in the current running kernel, run:

test -f /proc/net/if_inet6 && echo "Running kernel is IPv6 ready"

To enable the IPV6 run:

sysctl net.ipv6.conf.all.disable_ipv6=0

To disable it , run:

sysctl net.ipv6.conf.all.disable_ipv6=1

To check for IPv6 support in the current running kernel, run:

test -f /proc/net/if_inet6 && echo "Running kernel is IPv6 ready"

Edit

You can easly monitor IPV6 traffic through netdata tool , it can be installed as follows :

git clone https://github.com/firehol/netdata.git --depth=1
cd netdata
./netdata-installer.sh

Open your browser and type http://127.0.0.1:19999/ on the address bar .