Ensure DHCP resend interval is not to long

src/Cedar/IPC.c

@@ -899,7 +899,7 @@ DHCPV4_DATA *IPCSendDhcpRequest(IPC *ipc, IP *dest_ip, UINT tran_id, DHCP_OPTION
 	}
 
 	// Retransmission interval
-	resend_interval = MAX(1, (timeout / 3) - 100);
+	resend_interval = MIN(IPC_DHCP_MAX_RESEND_INTERVAL, MAX(1, (timeout / 3) - 100));
 
 	// Time-out time
 	giveup_time = Tick64() + (UINT64)timeout;

src/Cedar/IPC.h

@@ -19,6 +19,7 @@
 #define	IPC_DHCP_TIMEOUT				(5 * 1000)
 #define	IPC_DHCP_MIN_LEASE				5
 #define	IPC_DHCP_DEFAULT_LEASE			3600
+#define	IPC_DHCP_MAX_RESEND_INTERVAL	(3 * 1000)
 
 #define	IPC_MAX_PACKET_QUEUE_LEN		10000