Reference Guide

● link local addresses
● loopback addresses
● prefix addresses
● multicast addresses
● invalid host addresses
If you specify this information in the IPv6 RDNSS configuration, a DNS error is displayed.
Example for Configuring an IPv6 Recursive DNS Server
The following example configures a RDNNS server with an IPv6 address of 1000::1 and a lifetime of 1 second.
Dell(conf-if-te-0/1)#ipv6 nd dns-server ?
X:X:X:X::X Recursive DNS Server's (RDNSS) IPv6 address
Dell(conf-if-te-0/1)#ipv6 nd dns-server 1000::1 ?
<0-4294967295> Max lifetime (sec) which RDNSS address may be used for name
resolution
infinite Infinite lifetime (sec) which RDNSS address may be used for name
resolution
Dell(conf-if-te-0/1)#ipv6 nd dns-server 1000::1 1
Debugging IPv6 RDNSS Information Sent to the Host
To verify that the IPv6 RDNSS information sent to the host is configured correctly, use the debug ipv6 nd command in
EXEC Privilege mode.
Example of Debugging IPv6 RDNSS Information Sent to the Host
The following example debugs IPv6 RDNSS information sent to the host.
Dell(conf-if-te-0/1)#do debug ipv6 nd tengigabitethernet 0/1
ICMPv6 Neighbor Discovery packet debugging is on for tengigabitethernet 0/1
Dell(conf-if-te-0/1)#00:13:02 : : cp-ICMPV6-ND: Sending RA on Te 0/1
current hop limit=64, flags: M-, O-,
router lifetime=1800 sec, reachable time=0 ms, retransmit time=0 ms
SLLA=00:01:e8:8b:75:70
prefix=1212::/64 on-link autoconfig
valid lifetime=2592000 sec, preferred lifetime=604800 sec
dns-server=1000::0001, lifetime=1 sec
dns-server=3000::0001, lifetime=1 sec
dns-server=2000::0001, lifetime=0 sec
The last 3 lines indicate that the IPv6 RDNSS information was configured correctly.
dns-server=1000::0001, lifetime=1 sec
dns-server=3000::0001, lifetime=1 sec
dns-server=2000::0001, lifetime=0 sec
If the DNS server information is not displayed, verify that the IPv6 recursive DNS server configuration was configured on the
correct interface.
Displaying IPv6 RDNSS Information
To display IPv6 interface information, including IPv6 RDNSS information, use the show ipv6 interface command in EXEC
or EXEC Privilege mode.
Examples of Displaying IPv6 RDNSS Information
The following example displays IPv6 RDNSS information. The output in the last 3 lines indicates that the IPv6 RDNSS was
correctly configured on interface te 0/1.
Dell#show ipv6 interface te 0/1
TenGigabitEthernet 0/1 is up, line protocol is up
IPv6 Routing
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