Version:
DNS-Server#show ver
Cisco IOS Software, 7200 Software (C7200-ADVENTERPRISEK9_SNA-M), Version 15.2(4)M11, RELEASE SOFTWARE (fc2DNS6, )
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Sun 16-Oct-16 07:53 by prod_rel_team
Key configuration on DNS server:
!
ip cef
ipv6 host www.cisco.com 2004::1
ipv6 unicast-routing
ipv6 cef
!
interface Loopback0
no ip address
ipv6 address 2003::1/64
ipv6 enable
!
Issue:
After I ping www.cisco.com on DNS client side, ICMPv6 Port-Unreacable received.
I found the AAAA query has alreay sent to the DNS server, but DNS6 server can not be opent. Only IPv4 DNS server can be opent.
DNS-Server#show udp
Proto Remote Port Local Port In Out Stat TTY OutputIF
17 0.0.0.0 0 --any-- 53 0 0 1000211 0
How can I open the DNS6 server feature?
Packet below was captured on server.
Ethernet II, Src: ca:02:4b:b0:00:1c (ca:02:4b:b0:00:1c), Dst: ca:01:3d:80:00:1c (ca:01:3d:80:00:1c)
Internet Protocol Version 6, Src: 2023::3, Dst: 2012::1
Internet Control Message Protocol v6
Type: Destination Unreachable (1)
Code: 4 (Port unreachable)
Checksum: 0x4d03 [correct]
[Checksum Status: Good]
Reserved: 00000000
Internet Protocol Version 6, Src: 2012::1, Dst: 2003::1
0110 .... = Version: 6
.... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
.... .... .... 0000 0000 0000 0000 0000 = Flow Label: 0x00000
Payload Length: 39
Next Header: UDP (17)
Hop Limit: 63
Source: 2012::1
Destination: 2003::1
User Datagram Protocol, Src Port: 63408, Dst Port: 53
Source Port: 63408
Destination Port: 53
Length: 39
Checksum: 0xd810 [unverified]
[Checksum Status: Unverified]
[Stream index: 18]
Domain Name System (query)
TRANSUM RTE Data
