UNIST internet tip – DNS
Why sometimes can’t I connect to ecl.unist.ac.kr or some other UNIST sites?
Most likely, the server is fine, but the DNS (Domain Name Server) setting has a problem.
Then how should I fix it?
The short answer is to use the primary DNS only: 10.0.2.204, or if you must use the secondary as well, try this: 10.0.2.220.
According to the DNS Setting Guide, 2009.8 version, the primary DNS of UNIST is 10.0.2.204, and the secondary is 114.70.1.52. Or if you use WUNIST_AAA (campus-wide wireless network) the secondary DNS is 10.0.2.205. Those secondary DNS servers all have problems. The 114.70.1.52 server returns external IPs for internal server domains, which don’t work more often than it do. The 10.0.2.205 server doesn’t work at all. So the solution is just to remove the secondary DNS, and use the primary only.
What if I’m using DHCP — for example, WUNIST_AAA? Then you can’t get rid of 10.0.2.205, but it should be fine because 10.0.2.205 doesn’t return anything, so your computer will try the primary only anyway.