DNS
From Noah.org
Jump to navigationJump to searchTesting
I use DNSdoctor
CNAME versus A records
It is common to get these two backwards when first learning DNS. "A" does not stand for alias. "A" stands for Address. It maps a name to an IP address. CNAME might sound like you are defining a canonical name, but it is the other way around. It maps an alias name to a canonical name. So really the CNAME is the alias.
resolv.conf
I add some public nameserver to the end of my resolv.conf on my home machines. These are not the fastest or most reliable nameservers, but they keep my machine going if my ISP DNS goes down. PortForward also maintains a list of public DNS servers.
nameserver 4.2.2.1 nameserver 4.2.2.2 nameserver 4.2.2.3 nameserver 4.2.2.4 nameserver 4.2.2.5 nameserver 4.2.2.6 nameserver 198.6.1.1 nameserver 199.166.24.253 nameserver 199.166.27.253 nameserver 199.166.28.10 nameserver 199.166.29.3 nameserver 199.166.31.3 nameserver 195.117.6.25 nameserver 204.57.55.100