참고로 예전 DNS tunneling 프로그램 삽질할 때 그려 놓았던 Domain Name BNF 간략 버전.
DOT := '.'ALPHA := 'A'~'Z' or 'a'~'z'DIGIT := '0'~'9'ALPHA_DIGIT := ALPHA or DIGITDOMAIN_LABEL := (ALPHA_DIGIT) +DOMAIN_NAME := DOMAIN_LABEL ( DOT and DOMAIN_LABEL ) *
DOT := '.'
ALPHA := 'A'~'Z' or 'a'~'z'
DIGIT := '0'~'9'
ALPHA_DIGIT := ALPHA or DIGIT
DOMAIN_LABEL := (ALPHA_DIGIT) +
DOMAIN_NAME := DOMAIN_LABEL ( DOT and DOMAIN_LABEL ) *
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