At the directory /proc/sys there are some special setting to IPv6. Because usually at this directory contain the entry that having read-only character, so we only can see by using command “cat”, cannot with “ echo” and “sysctl”. And that setting like following

ipv6_route
This entry contain all setting IPV6 routing which showing with special format

if_inet6
This entry contain all setting IPv6 address each every interface posed at in special format, for example address loopback will have the value setting like following

# cat /proc/net/if_inet6
00000000000000000000000000000001   01  80   10   80    lo
+——————————+ ++  ++  ++  ++  ++
|                                                                 |      |     |      |      |
1                                                                2     3    4      5     6

snmp6
This entry contain the data information MIB IPv6, for example
[root@stuff root]# cat /proc/net/snmp6
Ip6InReceives 72
Ip6InHdrErrors 0
Ip6InTooBigErrors 0
Ip6InNoRoutes 0
Ip6InAddrErrors 0
. . . . .

Besides, there is still some entries like udp6, igmp6, raw6, ip6_flowlable, and ip6_tables_names

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