Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.0P1 - Page 446
Debugging IPv6 RDNSS Information Sent to the Host
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The DNS server address does not allow the following: • 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-1/1)#ipv6 nd dns-server ? X:X:X:X::X Recursive DNS Server's (RDNSS) IPv6 address Dell(conf-if-te-1/1)#ipv6 nd dns-server 1000::1 ? 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-1/1)#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-1/1)#do debug ipv6 nd tengigabitethernet 1/1 ICMPv6 Neighbor Discovery packet debugging is on for tengigabitethernet 1/1 Dell(conf-if-te-1/1)#00:13:02 : : cp-ICMPV6-ND: Sending RA on Te 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. 446 IPv6 Routing
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