9800CL Controller with IPv6 and Smart licensing strange behaviour
we are running a controller 9800-CL with Release 17.3 configured both for IPv4 and IPv6 on its interfaces and also for naming resolution.
The controller was registered with the Smart Account/Licensing but lately as soon we've added APs the license usage was in pending with HTTP communication error... pinging with IP Address or naming was fine .
wlan#ping 188.8.131.52 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 184.108.40.206, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 3/7/14 ms wlan#ping tools.cisco.com Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 220.127.116.11, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 163/163/164 ms
But when I tried https connection to tools.cisco.com 443 I've noted that DNS resolution was done each time with IPv6
wlan#telnet tools.cisco.com 443 Trying 2001:420:1101:5::A, 443 ... % Destination unreachable; gateway or host down
Removing IPv6 on the interface has solved the problem...
How can I force on IOS to use always IPv4 naming resolution since I'm obliged to keep both v4 and v6?
This is completely offline, and no need to expose the WLC interfaces towards internet. Another option is you can consider deploying a CSSM on-prem. I find smart licensing is always a challenge when the SSM cloud is configured.
Also note that even if you have HA redundant controllers and you still can deploy licenses only in the Primary WLC and leave the secondary WLC with eval licenses as 9800 still doesn't enforce the licenses. Only catch is when standby becomes primary it will throw out some warning syslog messages which you can easily ignore. I find peace at configuring SLR for my customers as I don't have to go through all these issues.
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