Linux IPv6 HOWTO (en)
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# 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

1. IPv6 address displayed in 32 hexadecimal chars without colons as separator

2. Netlink device number (interface index) in hexadecimal (see “ip addr” , too)

3. Prefix length in hexadecimal

4. Scope value (see kernel source “ include/net/ipv6.h” and “net/ipv6/addrconf.c” for more)

5. Interface flags (see “include/linux/rtnetlink.h” and “net/ipv6/addrconf.c” for more)

6. 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

1. IPv6 destination network displayed in 32 hexadecimal chars without colons as separator

2. IPv6 destination prefix length in hexadecimal

3. IPv6 source network displayed in 32 hexadecimal chars without colons as separator

4. IPv6 source prefix length in hexadecimal

5. IPv6 next hop displayed in 32 hexadecimal chars without colons as separator

6. Metric in hexadecimal

7. Reference counter

8. Use counter

9. Flags

10. 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 7
    UDP6: inuse 2
    RAW6: inuse 1
    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

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