TAG_DHCP_MSGTYPE
bp->bp_vend[4] = TAG_DHCP_MSGTYPE;
if (tag == TAG_DHCP_MSGTYPE) {
*vendp++ = TAG_DHCP_MSGTYPE;
*vendp++ = TAG_DHCP_MSGTYPE;
gctx->replylen, TAG_DHCP_MSGTYPE);
TAG_DHCP_MSGTYPE);