IPv6 Neighbor Discovery

Overview

Cisco IOS の IPv6 Neighbor Discovery の動作を確認する。

Reference

IPv6 ( wikipedia )
Internet Control Message Protocol for IPv6 ( wikipedia )
IPv6 アドレッシングおよび基本的な接続のコンフィギュレーションガイド、Cisco IOS XE Release 3S ( Cisco )
NDisc6 : IPv6 diagnostic tools for Linux and BSD

RFC’s

Environment

Router01

RT01#show ver
Cisco IOS Software, C181X Software (C181X-ADVIPSERVICESK9-M), Version 15.1(4)M12a, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Tue 04-Oct-16 02:58 by prod_rel_team

ROM: System Bootstrap, Version 12.3(8r)YH13, RELEASE SOFTWARE (fc1)

RT01 uptime is 2 hours, 51 minutes
System returned to ROM by power-on
System image file is "flash:c181x-advipservicesk9-mz.151-4.M12a.bin"
Last reload type: Normal Reload

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco 1812-J (MPC8500) processor (revision 0x400) with 236544K/25600K bytes of memory.
Processor board ID FGL1520247S, with hardware revision 0000

10 FastEthernet interfaces
1 ISDN Basic Rate interface
1 Virtual Private Network (VPN) Module
62720K bytes of ATA CompactFlash (Read/Write)

License Info:

License UDI:

-------------------------------------------------
Device# PID SN
-------------------------------------------------
*0 CISCO1812-J/K9 FGL1520247S

Configuration register is 0x2102

RT01#

Router02

RT02#show version
Cisco IOS Software, C181X Software (C181X-ADVIPSERVICESK9-M), Version 15.1(4)M12a, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Tue 04-Oct-16 02:58 by prod_rel_team

ROM: System Bootstrap, Version 12.3(8r)YH13, RELEASE SOFTWARE (fc1)

RT02 uptime is 2 hours, 41 minutes
System returned to ROM by reload at 03:34:56 UTC Sat Sep 26 2020
System image file is "flash:c181x-advipservicesk9-mz.151-4.M12a.bin"
Last reload type: Normal Reload

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco 1812-J (MPC8500) processor (revision 0x400) with 236544K/25600K bytes of memory.
Processor board ID FGL151020VL, with hardware revision 0000

10 FastEthernet interfaces
1 ISDN Basic Rate interface
1 Virtual Private Network (VPN) Module
62720K bytes of ATA CompactFlash (Read/Write)

License Info:

License UDI:

-------------------------------------------------
Device# PID SN
-------------------------------------------------
*0 CISCO1812-J/K9 FGL151020VL

Configuration register is 0x2102

RT02#

Configuration

Router01

RT01#show running-config interface FastEthernet 0
Building configuration...

Current configuration : 156 bytes
!
interface FastEthernet0
 ip address 172.16.31.1 255.255.255.0
 duplex auto
 speed auto
 ipv6 address FE80::1 link-local
 ipv6 address 2001:DB8::1/64
end

RT01#

Router02

RT02#sh running-config interface FastEthernet 0
Building configuration...

Current configuration : 156 bytes
!
interface FastEthernet0
 ip address 172.16.31.2 255.255.255.0
 duplex auto
 speed auto
 ipv6 address FE80::2 link-local
 ipv6 address 2001:DB8::2/64
end

RT02#

Debug & Operation

Debug

RT01#show debugging 
  ICMP Neighbor Discovery events debugging is on
RT01#

Operation

RT01#
RT01#clear ipv6 neighbors 
RT01#
*Sep 26 05:24:34.703: ICMPv6-ND: STALE -> DELETE: FE80::2
*Sep 26 05:24:34.703: ICMPv6-ND: STALE -> DELETE: 2001:DB8::2
RT01#
RT01#
RT01#ping 2001:db8::2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:DB8::2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 0/1/8 ms
RT01#
*Sep 26 05:24:55.387: ICMPv6-ND: DELETE -> INCMP: 2001:DB8::2
*Sep 26 05:24:55.387: ICMPv6-ND: Sending NS for 2001:DB8::2 on FastEthernet0
*Sep 26 05:24:55.387: ICMPv6-ND: Resolving next hop 2001:DB8::2 on interface FastEthernet0
*Sep 26 05:24:55.395: ICMPv6-ND: Received NA for 2001:DB8::2 on FastEthernet0 from 2001:DB8::2
*Sep 26 05:24:55.395: ICMPv6-ND: Neighbour 2001:DB8::2 on FastEthernet0 : LLA c89c.1d24.2ae2
*Sep 26 05:24:55.395: ICMPv6-ND: INCMP -> REACH: 2001:DB8::2
*Sep 26 05:25:00.455: ICMPv6-ND: Received NS for 2001:DB8::1 on FastEthernet0 from FE80::2
*Sep 26 05:25:00.455: ICMPv6-ND: Glean FE80::2 on FastEthernet0
*Sep 26 05:25:00.455: ICMPv6-ND: Neighbour FE80::2 on FastEthernet0 : LLA c89c.1d24.2ae2
*Sep 26 05:25:00.455: ICMPv6-ND: INCMP -> STALE: FE80::2
*Sep 26 05:25:00.455: ICMPv6-ND: Sending NA for 2001:DB8::1 on FastEthernet0
*Sep 26 05:25:00.459: ICMPv6-ND: STALE -> DELAY: FE80::2
*Sep 26 05:25:05.519: ICMPv6-ND: DELAY -> PROBE: FE80::2
*Sep 26 05:25:05.519: ICMPv6-ND: Sending NS for FE80::2 on FastEthernet0
*Sep 26 05:25:05.527: ICMPv6-ND: Received NA for FE80::2 on FastEthernet0 from FE80::2
*Sep 26 05:25:05.527: ICMPv6-ND: PROBE -> REACH: FE80::2
*Sep 26 05:25:10.587: ICMPv6-ND: Received NS for FE80::1 on FastEthernet0 from FE80::2
*Sep 26 05:25:10.587: ICMPv6-ND: Sending NA for FE80::1 on FastEthernet0
*Sep 26 05:25:25.463: ICMPv6-ND: REACH -> STALE: 2001:DB8::2
RT01#
RT01#undeb all
All possible debugging has been turned off
RT01#
*Sep 26 05:25:35.603: ICMPv6-ND: REACH -> STALE: FE80::2
RT01#

RT01#show ipv6 neighbors 
IPv6 Address                              Age Link-layer Addr State Interface
FE80::2                                     1 c89c.1d24.2ae2  STALE Fa0
2001:DB8::2                                 2 c89c.1d24.2ae2  STALE Fa0

RT01#

Packet

Packets

No.     Time           Source                Destination           Protocol Length Info
     20 31.667727481   2001:db8::1           ff02::1:ff00:2        ICMPv6   86     Neighbor Solicitation for 2001:db8::2 from e8:b7:48:67:9c:4e
     21 31.672033472   2001:db8::2           2001:db8::1           ICMPv6   86     Neighbor Advertisement 2001:db8::2 (sol, ovr) is at c8:9c:1d:24:2a:e2
     22 31.672817567   2001:db8::1           2001:db8::2           ICMPv6   114    Echo (ping) request id=0x20b6, seq=0, hop limit=64 (reply in 23)
     23 31.673176486   2001:db8::2           2001:db8::1           ICMPv6   114    Echo (ping) reply id=0x20b6, seq=0, hop limit=64 (request in 22)
     24 31.673765807   2001:db8::1           2001:db8::2           ICMPv6   114    Echo (ping) request id=0x20b6, seq=1, hop limit=64 (reply in 25)
     25 31.674258443   2001:db8::2           2001:db8::1           ICMPv6   114    Echo (ping) reply id=0x20b6, seq=1, hop limit=64 (request in 24)
     26 31.674781148   2001:db8::1           2001:db8::2           ICMPv6   114    Echo (ping) request id=0x20b6, seq=2, hop limit=64 (reply in 27)
     27 31.675136640   2001:db8::2           2001:db8::1           ICMPv6   114    Echo (ping) reply id=0x20b6, seq=2, hop limit=64 (request in 26)
     28 31.675694197   2001:db8::1           2001:db8::2           ICMPv6   114    Echo (ping) request id=0x20b6, seq=3, hop limit=64 (reply in 29)
     29 31.676120777   2001:db8::2           2001:db8::1           ICMPv6   114    Echo (ping) reply id=0x20b6, seq=3, hop limit=64 (request in 28)
     30 31.676678836   2001:db8::1           2001:db8::2           ICMPv6   114    Echo (ping) request id=0x20b6, seq=4, hop limit=64 (reply in 31)
     31 31.677033280   2001:db8::2           2001:db8::1           ICMPv6   114    Echo (ping) reply id=0x20b6, seq=4, hop limit=64 (request in 30)
     36 36.732215095   fe80::2               2001:db8::1           ICMPv6   86     Neighbor Solicitation for 2001:db8::1 from c8:9c:1d:24:2a:e2
     37 36.736071218   2001:db8::1           fe80::2               ICMPv6   78     Neighbor Advertisement 2001:db8::1 (rtr, sol)
     41 41.799987967   fe80::1               fe80::2               ICMPv6   86     Neighbor Solicitation for fe80::2 from e8:b7:48:67:9c:4e
     42 41.804294669   fe80::2               fe80::1               ICMPv6   78     Neighbor Advertisement fe80::2 (sol)
     47 46.864399598   fe80::2               fe80::1               ICMPv6   86     Neighbor Solicitation for fe80::1 from c8:9c:1d:24:2a:e2
     48 46.868148614   fe80::1               fe80::2               ICMPv6   78     Neighbor Advertisement fe80::1 (rtr, sol)
     49 47.861879477   fe80::21f:67ff:fee1:4bc0 ff02::1               ICMPv6   90     Multicast Listener Query
     54 53.632005830   fe80::2f69:5ab3:b79f:fb25 ff02::16              ICMPv6   130    Multicast Listener Report Message v2

Router01

ICMPv6 Type 135 (Neighbor Solicitation)

No.     Time           Source                Destination           Protocol Length Info
     20 31.667727481   2001:db8::1           ff02::1:ff00:2        ICMPv6   86     Neighbor Solicitation for 2001:db8::2 from e8:b7:48:67:9c:4e

Ethernet II, Src: Cisco_67:9c:4e (e8:b7:48:67:9c:4e), Dst: IPv6mcast_ff:00:00:02 (33:33:ff:00:00:02)
    Destination: IPv6mcast_ff:00:00:02 (33:33:ff:00:00:02)
    Source: Cisco_67:9c:4e (e8:b7:48:67:9c:4e)
    Type: IPv6 (0x86dd)
Internet Protocol Version 6, Src: 2001:db8::1, Dst: ff02::1:ff00:2
    0110 .... = Version: 6
    .... 1110 0000 .... .... .... .... .... = Traffic Class: 0xe0 (DSCP: CS7, ECN: Not-ECT)
    .... .... .... 0000 0000 0000 0000 0000 = Flow Label: 0x00000
    Payload Length: 32
    Next Header: ICMPv6 (58)
    Hop Limit: 255
    Source: 2001:db8::1
    Destination: ff02::1:ff00:2
Internet Control Message Protocol v6
    Type: Neighbor Solicitation (135)
    Code: 0
    Checksum: 0x50ba [correct]
    [Checksum Status: Good]
    Reserved: 00000000
    Target Address: 2001:db8::2
    ICMPv6 Option (Source link-layer address : e8:b7:48:67:9c:4e)
        Type: Source link-layer address (1)
        Length: 1 (8 bytes)
        Link-layer address: Cisco_67:9c:4e (e8:b7:48:67:9c:4e)

0000  33 33 ff 00 00 02 e8 b7 48 67 9c 4e 86 dd 6e 00   33......Hg.N..n.
0010  00 00 00 20 3a ff 20 01 0d b8 00 00 00 00 00 00   ... :. .........
0020  00 00 00 00 00 01 ff 02 00 00 00 00 00 00 00 00   ................
0030  00 01 ff 00 00 02 87 00 50 ba 00 00 00 00 20 01   ........P..... .
0040  0d b8 00 00 00 00 00 00 00 00 00 00 00 02 01 01   ................
0050  e8 b7 48 67 9c 4e                                 ..Hg.N

ICMPv6 Type 136 (Neighbor Advertisement)

No.     Time           Source                Destination           Protocol Length Info
     21 31.672033472   2001:db8::2           2001:db8::1           ICMPv6   86     Neighbor Advertisement 2001:db8::2 (sol, ovr) is at c8:9c:1d:24:2a:e2

Ethernet II, Src: Cisco_24:2a:e2 (c8:9c:1d:24:2a:e2), Dst: Cisco_67:9c:4e (e8:b7:48:67:9c:4e)
    Destination: Cisco_67:9c:4e (e8:b7:48:67:9c:4e)
    Source: Cisco_24:2a:e2 (c8:9c:1d:24:2a:e2)
    Type: IPv6 (0x86dd)
Internet Protocol Version 6, Src: 2001:db8::2, Dst: 2001:db8::1
    0110 .... = Version: 6
    .... 1110 0000 .... .... .... .... .... = Traffic Class: 0xe0 (DSCP: CS7, ECN: Not-ECT)
    .... .... .... 0000 0000 0000 0000 0000 = Flow Label: 0x00000
    Payload Length: 32
    Next Header: ICMPv6 (58)
    Hop Limit: 255
    Source: 2001:db8::2
    Destination: 2001:db8::1
Internet Control Message Protocol v6
    Type: Neighbor Advertisement (136)
    Code: 0
    Checksum: 0x7bd0 [correct]
    [Checksum Status: Good]
    Flags: 0x60000000, Solicited, Override
    Target Address: 2001:db8::2
    ICMPv6 Option (Target link-layer address : c8:9c:1d:24:2a:e2)
        Type: Target link-layer address (2)
        Length: 1 (8 bytes)
        Link-layer address: Cisco_24:2a:e2 (c8:9c:1d:24:2a:e2)

0000  e8 b7 48 67 9c 4e c8 9c 1d 24 2a e2 86 dd 6e 00   ..Hg.N...$*...n.
0010  00 00 00 20 3a ff 20 01 0d b8 00 00 00 00 00 00   ... :. .........
0020  00 00 00 00 00 02 20 01 0d b8 00 00 00 00 00 00   ...... .........
0030  00 00 00 00 00 01 88 00 7b d0 60 00 00 00 20 01   ........{.`... .
0040  0d b8 00 00 00 00 00 00 00 00 00 00 00 02 02 01   ................
0050  c8 9c 1d 24 2a e2                                 ...$*.

Router02

ICMPv6 Type 135 (Neighbor Solicitation)

No.     Time           Source                Destination           Protocol Length Info
     36 36.732215095   fe80::2               2001:db8::1           ICMPv6   86     Neighbor Solicitation for 2001:db8::1 from c8:9c:1d:24:2a:e2

Ethernet II, Src: Cisco_24:2a:e2 (c8:9c:1d:24:2a:e2), Dst: Cisco_67:9c:4e (e8:b7:48:67:9c:4e)
    Destination: Cisco_67:9c:4e (e8:b7:48:67:9c:4e)
    Source: Cisco_24:2a:e2 (c8:9c:1d:24:2a:e2)
    Type: IPv6 (0x86dd)
Internet Protocol Version 6, Src: fe80::2, Dst: 2001:db8::1
    0110 .... = Version: 6
    .... 1110 0000 .... .... .... .... .... = Traffic Class: 0xe0 (DSCP: CS7, ECN: Not-ECT)
    .... .... .... 0000 0000 0000 0000 0000 = Flow Label: 0x00000
    Payload Length: 32
    Next Header: ICMPv6 (58)
    Hop Limit: 255
    Source: fe80::2
    Destination: 2001:db8::1
Internet Control Message Protocol v6
    Type: Neighbor Solicitation (135)
    Code: 0
    Checksum: 0x0d0a [correct]
    [Checksum Status: Good]
    Reserved: 00000000
    Target Address: 2001:db8::1
    ICMPv6 Option (Source link-layer address : c8:9c:1d:24:2a:e2)
        Type: Source link-layer address (1)
        Length: 1 (8 bytes)
        Link-layer address: Cisco_24:2a:e2 (c8:9c:1d:24:2a:e2)

0000  e8 b7 48 67 9c 4e c8 9c 1d 24 2a e2 86 dd 6e 00   ..Hg.N...$*...n.
0010  00 00 00 20 3a ff fe 80 00 00 00 00 00 00 00 00   ... :...........
0020  00 00 00 00 00 02 20 01 0d b8 00 00 00 00 00 00   ...... .........
0030  00 00 00 00 00 01 87 00 0d 0a 00 00 00 00 20 01   .............. .
0040  0d b8 00 00 00 00 00 00 00 00 00 00 00 01 01 01   ................
0050  c8 9c 1d 24 2a e2                                 ...$*.

ICMPv6 Type 136 (Neighbor Advertisement)

No.     Time           Source                Destination           Protocol Length Info
     37 36.736071218   2001:db8::1           fe80::2               ICMPv6   78     Neighbor Advertisement 2001:db8::1 (rtr, sol)

Ethernet II, Src: Cisco_67:9c:4e (e8:b7:48:67:9c:4e), Dst: Cisco_24:2a:e2 (c8:9c:1d:24:2a:e2)
    Destination: Cisco_24:2a:e2 (c8:9c:1d:24:2a:e2)
    Source: Cisco_67:9c:4e (e8:b7:48:67:9c:4e)
    Type: IPv6 (0x86dd)
Internet Protocol Version 6, Src: 2001:db8::1, Dst: fe80::2
    0110 .... = Version: 6
    .... 1110 0000 .... .... .... .... .... = Traffic Class: 0xe0 (DSCP: CS7, ECN: Not-ECT)
    .... .... .... 0000 0000 0000 0000 0000 = Flow Label: 0x00000
    Payload Length: 24
    Next Header: ICMPv6 (58)
    Hop Limit: 255
    Source: 2001:db8::1
    Destination: fe80::2
Internet Control Message Protocol v6
    Type: Neighbor Advertisement (136)
    Code: 0
    Checksum: 0x5db5 [correct]
    [Checksum Status: Good]
    Flags: 0xc0000000, Router, Solicited
    Target Address: 2001:db8::1

0000  c8 9c 1d 24 2a e2 e8 b7 48 67 9c 4e 86 dd 6e 00   ...$*...Hg.N..n.
0010  00 00 00 18 3a ff 20 01 0d b8 00 00 00 00 00 00   ....:. .........
0020  00 00 00 00 00 01 fe 80 00 00 00 00 00 00 00 00   ................
0030  00 00 00 00 00 02 88 00 5d b5 c0 00 00 00 20 01   ........]..... .
0040  0d b8 00 00 00 00 00 00 00 00 00 00 00 01         ..............

IP Protocol