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Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

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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.

DellEMC(conf-if-gi-1/1)#do debug ipv6 nd gigabitethernet 1/1
ICMPv6 Neighbor Discovery packet debugging is on for gigabitethernet 1/1
DellEMC(conf-if-gi-1/1)#00:13:02 : : cp-ICMPV6-ND: Sending RA on Gi 1/1
            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.

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