DHCPNAK (reference) in projects: busybox-1.35.0

23 	case DHCPNAK:  in udhcp_init_header()

240 	if (type != DHCPOFFER && type != DHCPACK && type != DHCPNAK) {  in pass_to_client()

1809 			if (*message == DHCPNAK) {  in udhcpc_main()

/busybox-1.35.0/networking/udhcp/
D	packet.c	`23 case DHCPNAK: in udhcp_init_header()`
D	common.h	`208 #define DHCPNAK 6 /* client <- server */ macro`
D	dhcprelay.c	`240 if (type != DHCPOFFER && type != DHCPACK && type != DHCPNAK) { in pass_to_client()`
D	dhcpd.c	`800 init_packet(&packet, oldpacket, DHCPNAK); in send_NAK()`
D	dhcpc.c	`1809 if (*message == DHCPNAK) { in udhcpc_main()`