__8
{19, __8, "ip-forwarding"},
{20, __8, "non-local-source-routing"},
{23, __8, "default-ip-ttl"},
{27, __8, "all-subnets-local"},
{29, __8, "perform-mask-discovery"},
{30, __8, "mask-supplier"},
{31, __8, "perform-router-discovery"},
{34, __8, "trailer-encapsulation"},
{36, __8, "ieee802-3-encapsulation"},
{37, __8, "default-tcp-ttl"},
{39, __8, "tcp-keepalive-garbage"},
{46, __8, "netbios-node-type"},
{52, __8, "dhcp-option-overload"},
{53, __8, "dhcp-message-type"},
{55, __8, "dhcp-parameter-request-list"},
case __8: /* op->fmt is also the length of each field */