# option ::= token " " value
# token ::= "range" | "ttl" | "rttl" | "router" | "dns-servers" | "ntp-servers" | "broadcast" | "domain-name"
# value ::= us-ascii
# option ::= token " " value
# token ::= "range" | "ttl" | "rttl" | "router" | "dns-servers" | "ntp-servers" | "broadcast" | "domain-name"
# value ::= us-ascii
# soptions ::= soption ";" | soptions
# soption ::= allow | static
# allow ::= "allow" " " allow-list
# soptions ::= soption ";" | soptions
# soption ::= allow | static
# allow ::= "allow" " " allow-list