WLAN switches are quite common. So I studied the functions of WLAN switches and how to quickly implement the networking scheme. I would like to share with you here, hoping to help you. A wlan switch can connect to a WLAN Access Point (AP) through a wired connection (with a switch port ). They can also connect to the enterprise network through their other WLAN switch ports. These switches are the "gateways" connecting to the enterprise's wired network-
Wireless Network coverage system knowledge points, wireless network coverage knowledge points
1. What is AP?
A: AP-WirelessAccessPoint AP is a HUB in a traditional wired network and the most common device used to build a small wireless LAN. AP is equivalent to a bridge connecting a wired network and a wireless network
capture file. We can change the default name, for example, change it to "capture" and then click OK, in this way, Kismet will start with capture as the file name, and then add the sequence number to save the captured packets to different files.
Figure 13: Specify the file storage location in kismet
When Kismet starts running, it will display all wireless LAN addresses it finds in this region, the content displayed in the "name" column is the SSID value of the
Look at the code first
Copy Code code as follows:
printf ("hello,world!"); The number of parameters is 1.
printf ("a=%d,b=%s,c=%c", a,b,c) with a number of 4 parameters.
How do I write variable parameter functions? Let's first look at how the printf function prototype is defined.
Under Linux, enter the man 3 printf, you can see the Prinf function prototype as follows:
Copy Code code as follows:
Synopsis
#include int printf (const char *format, ...);
1. Mixed wireless networks often fall off the line
Failure phenomenon
Use the Linksys WPC54G network card and Linksys WRT54G AP to build a wireless LAN that uses IEEE 802.11G protocols and a few 802.11B network adapters. The line is often dropped when using wrt54g for 54mb/s connections.
Fault analysis
In theory, the IEEE 802.11g protocol is backward-compatible with the 802.11B protocol, and devices using both protocols can be connected simultaneo
report */For (I = 0; I Struct ata_port * ap = Host-> ports [I];Unsigned long xfer_mask;
/* Set SATA cable type if still unset */If (ap-> CBl = ata_cbl_none (ap-> flags ata_flag_sata ))AP-> CBl = ata_cbl_sata;
/* Init sata_spd_limit to the current value */Sata_link_init_spd (
); char *pz = py + sizeof(int); printf("x=%d, y=%d, z=%d\n", x, *(int*)py, *(int*)pz);}int main(){ f(100, 200, 300); return 0;}2.2 how to identify the number and type of subsequent Parameters
Although it is written as a variable parameter, how can the function determine the number and type of the subsequent real parameters? This requires such information to be carried in fixed parameters, such as printf (char *,...) The format string method used. The first parameter carries the numbe
0. Introduction
With the development of wireless technology and network technology, wireless networks are becoming a hot spot in the market. However, with the improvement of hacker technology, wireless LAN (WLAN) is under more and more threats. Wireless networks are not only attacked based on the traditional wired network's TCP/IP architecture, but may also be threatened by security issues based on the IEEE 802.11 standard. In order to better detect and defend against these potential threats, th
This is an example program that uses variable function parameters, as shown below:# Include # Include # Include // # Include
Typedef char * va_list;
// # DEFINE _ intsizeof (N) (sizeof (n) + sizeof (INT)-1 )~ (Sizeof (INT)-1 ))// # DefineVa_start(AP, V) (AP = (va_list) V + _ intsizeof (v ))// # Define va_arg (AP, t) (* (T *) (
that:C.ADDR = b.addr + x_sizeof (b); /* Note: x_sizeof!=sizeof */b.addr = a.addr + x_sizeof (a);With the "equation" above, it seems that we can deduce the position of the variable parameter in the void Var_args_func (const char * fmt, ...) function. At least the position of the first variable parameter should be: first_vararg.addr = fmt.addr + x_sizeof (FMT); Based on this conclusion, we try to implement a function that supports mutable parameters:#include #include void Var_args_func (const c
in the code. As to why it does not know the number of parameters, the reader will naturally understand after reading the internal implementation mechanisms of the following macros.
Variable parameters of functions in C Language
1. To use parameters in a function, you must first include
2. The stdarg. h header file contains the following macro definitions:Void va_start (va_list AP, last );Type va_arg (va_list AP
With the continuous warming of the wireless wave, more and more institutions, enterprises began to implement wireless local area network. Up to now, wireless LANs are typically made up of clients connected to access points, while access points provide security features, management functions, and other intelligence needed to control the wireless portion of the network.
The problem with this is that managing multiple access points is an impossible situation for networks that may involve hundreds
WLAN from getting started to mastering-Basic article "phase 8th--sta Access process
"WLAN from getting started to mastering-Basic article" phase 8th--sta Access Process
The last period and everyone to share the fit AP on the AC on-line process, in fact, whether the fat AP or on-line fit AP, the ultimate goal is to provide wireless network coverage environm
instructions in step 1 to solve the problem. ----------------------------------------------------------------------- 3. Run the second command "airodump-ng mon0" to view information about the peripheral route AP. Record the MAC address of the route you want to learn. Refer provides several ways to learn routing by using the PIN code. Note: You can use the PIN method to learn the PSK password only When WPS and QSS are enabled for the
4-way handshake of WPA
When the WPA system is working, the AP first publishes its own WPA support to the outside, and uses the newly defined WPA information element in beacons, probe response, and other reports ), these information elements contain AP security configuration information (including encryption algorithm and Security Configuration ). Sta selects the corresponding security configurati
in the invasion or there are multiple enrollee trying to connect, registrar will terminate all interaction, And wait for some time before allowing to try again.(2). Dh-key (k_tmp) degree of secrecy, because in the equation KwK = Hmac-dhkey (N1 | | Enrolleemac | | N2), the content in parentheses can be obtained by listening to the wireless WPS interaction message.In fact, the PBC does not refer to the simple click of the WPS button, it is a generic, including all the conditions that can trigger
Nearly a period of time, many traditional UTM manufacturers frequently released high-end products-first SonicWALL release 4G products, after the industry's eldest Fortinet thrown 26G of the top UTM. Some analysts pointed out that the emergence of high-performance UTM is not a long time, this is a long-term security manufacturers brewing. Because with the performance of new UTM products more and more high, the future security Gateway market pattern is
With the increasing popularity of wireless networks, more and more institutions and enterprises are beginning to implement wireless LAN. Up to now, wireless LAN is generally composed of clients connected to the access point, and the Access Point must provide security, management, and other intelligence required to control the wireless part of the network. The problem is that managing multiple access points is an insurmountable situation for networks that may involve hundreds or thousands of acce
Func (type para1, type para2, type para3 ,...){/****** Step 1 ******/Va_list AP;Va_start (AP, para3); // you must specify the parameter ** ap that points to the first variable parameter after para./****** Step 2 ******/// At this time, the AP points to the first variable parameter.// Call va_arg to obtain the valueType
Now, we will first explain the following process:
◎ Usage:Func (type para1, type para2, type para3 ,... ){/****** Step 1 ******/Va_list AP;Va_start (AP, para3); // be sure to "…" The previous parameter, and this parameter cannot make the reference type, because the reference type cannot obtain the address of the following parameter according to its address
/****** Step 2 ******/// At this time, the
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