You get reply when you ping to 18.104.22.168, but
you don't got reply when you ping to www.yahoo.com.
In this case, which system does not work correctly?
Please write more than 3 possible method
to solve it.
nslookup -d www.yahoo.com // all domain
nslookup -query=mx www.yahoo.com // if they arent getting
dig -x www.yahoo.com // ip format
web http://www.yahoo.com //if they have a web site email