I try remove "nf_defrag_ipv{4|6}_enabl", and then test by lsmod:
stack@devstack:~$ lsmod | grep defrag
nf_defrag_ipv6 36864 1 nf_conntrack_ipv6
nf_defrag_ipv4 16384 1 nf_conntrack_ipv4
stack@devstack:~$ lsmod | grep conntrack
nf_conntrack_ipv6 20480 1
nf_defrag_ipv6 36864 1 nf_conntrack_ipv6
nf_conntrack_ipv4 16384 5
nf_defrag_ipv4 16384 1 nf_conntrack_ipv4
without remove, nf_defrag_ipv6 is used by openvswitch:
stack@devstack:~/neutron$ lsmod | grep defrag
nf_defrag_ipv6 36864 2 openvswitch,nf_conntrack_ipv6
nf_defrag_ipv4 16384 1 nf_conntrack_ipv4
Normally, defrag will be loaded, but is not sure whether it is absolute.
In general, we try not to rely on kernel version number. In this case,
does it make sense to look at the signature of
nf_defrag_ipv{4|6}_enable instead?
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