IPv6 Kernel: IPv6 entri di /proc/net/

11.4. IPv6-related entries in /proc/net/

In /proc/net there are several read-only entries available. You cannot retrieve information using “sysctl” here, so use e.g. “cat”.

11.4.1. if_inet6

   Type: One line per addresss containing multiple values

Here all configured IPv6 addresses are shown in a special format. The example displays for loopback interface only. The meaning is shown below (see “net/ipv6/addrconf.c” for more).

# cat /proc/net/if_inet6

00000000000000000000000000000001 01 80 10 80 lo
+------------------------------+ ++ ++ ++ ++ ++
|                                |  |  |  |  |
1                                2  3  4  5  6

• IPv6 address displayed in 32 hexadecimal chars without colons as separator
• Netlink device number (interface index) in hexadecimal (see “ip addr” , too)
• Prefix length in hexadecimal
• Scope value (see kernel source “ include/net/ipv6.h” and “net/ipv6/addrconf.c” for more)
• Interface flags (see “include/linux/rtnetlink.h” and “net/ipv6/addrconf.c” for more)
• Device name

11.4.2. ipv6_route

   Type: One line per route containing multiple values

Here all configured IPv6 routes are shown in a special format. The example displays for loopback interface only. The meaning is shown below (see “net/ipv6/route.c” for more).

# cat /proc/net/ipv6_route

00000000000000000000000000000000 00 00000000000000000000000000000000 00
+------------------------------+ ++ +------------------------------+ ++
|                                |  |                                |
1                                2  3                                4

¬ 00000000000000000000000000000000 ffffffff 00000001 00000001 00200200 lo
¬ +------------------------------+ +------+ +------+ +------+ +------+ ++
¬ |                                |        |        |        |        |
¬ 5                                6        7        8        9        10

• IPv6 destination network displayed in 32 hexadecimal chars without colons as separator
• IPv6 destination prefix length in hexadecimal
• IPv6 source network displayed in 32 hexadecimal chars without colons as separator
• IPv6 source prefix length in hexadecimal
• IPv6 next hop displayed in 32 hexadecimal chars without colons as separator
• Metric in hexadecimal
• Reference counter
• Use counter
• Flags
• Device name

11.4.3. sockstat6

   Type: One line per protocol with description and value

Statistics about used IPv6 sockets. Example:

# cat /proc/net/sockstat6

TCP6: inuse 11
UDP6: inuse 3
UDPLITE6: inuse 0
RAW6: inuse 0
FRAG6: inuse 0 memory 0

11.4.4. tcp6

To be filled.

11.4.5. udp6

To be filled.

11.4.6. igmp6

To be filled.

11.4.7. raw6

To be filled.

11.4.8. ip6_flowlabel

To be filled.

11.4.9. rt6_stats

To be filled.

11.4.10. snmp6

   Type: One line per SNMP description and value

SNMP statistics, can be retrieved via SNMP server and related MIB table by network management software.

11.4.11. ip6_tables_names

Available netfilter6 tables