Notes on CNAME (1/2)

Another major source of DNS troubles

Note 1: avoid CNAME chain
    foo.example. CNAME bar.example.
    bar.example. CNAME baz.example.
    ...
not prohibited, but troublesome
loop-prone
may affect lookup performance

Note 2: do not use CNAME for NS/MX names
    kame.example.       NS    ns.kame.example.
    ns.kame.example.    CNAME cname.kame.example.
    cname.kame.example. A     192.0.2.1