ARP and determine getmac : MacAddress and configure
ARP
The Address Resolution Protocol ARP takes over the implementation of the MAC address to an IP address. In the so -called ARP cache IP addresses are stored , which were already resolved in Mac addresses. ARP will not find it here , is a broadcast (broadcast ) sent to all the network accessible by computer and Dell inspiron 1545 battery to determine the MAC address for the requested IP address. The unit , which includes the requested IP address responds , and sends its MAC address. ARP carries out the requesting computer ‘s IP address in the ARP cache, all requests to that machine will now be sent directly . After a reboot, all ARP messages are deleted – you do this with arp -d.
Arp -a displays the contents of the ARP cache. Arp -s IP address ” MAC address “creates a static entry . Arp /? shows all options. With arp -s IP ADDRESS MAC ADDRESS connects to the IP address with the MAC address. After a PC reboot but this entry is lost.
The use of the ARP protocol takes a specific security issue called ARP poisoning or ARP spoofing for themselves. This shows an attacker to an IP address a wrong MAC address and thus leads to questions.
Getmac : Mac -Address
Each network controller has a unique distinctive and not alterable MAC address (Media Access Control), which is essential for addressing the data packets on the Internet – the MAC address is now the physical address of your network card, which is usually in a fixed EEPROM Memory on the network card or the onboard LAN adapter in the BIOS chip is located . The MAC addresses are managed centrally , each address consists of twelve hexadecimal digits.
The well-known for IP addresses that are initially responsible for the addressing of the data packets are mapped to the MAC addresses. For every Internet communication has therefore to belonging to an IP address, MAC address to be sought. This is the address resolution ARP Procotol jurisdiction.
If you configure your network or router you often need the MAC addresses of your network adapter. To determine since Windows XP, Mac addresses ruckzuck Getmac.exe with the tool . That is, type in the command prompt and press Enter getmac . On Windows, there used the tool winipcfg . It is now not to all features of Windows, because its functionality through the further down command ipconfig / all is made available . You can install winipcfg but still.
Besides the well-known TCP / IP Protokollpaar Internet communication is based on a number of other protocols , including ICMP , Internet Control Message Protocol. ICMP is used for the transmission of short News used primarily deals with this is to collect status and error information. The main command of the Internet Control Message Protocol ping is .
Ping (Packet Internet Groper ) is the classic of the network command and the first choice if you want to test quickly whether your computer and Dell inspiron 1526 battery or network is the Internet or a Web site is reachable. Enter “ping IP address ” or ” ping ww.name -the- desired – website.de ” one . So , for example, ping www.pcwelt.de . This inquiry is called Echo Request. The pinging host responds when it is available, with an echo reply. If the connection is working properly, you should get a display that indicates whether obtained by the ping packets Web site as an answer.
Go to site pinged the IP address is specified (this is relevant for Internet communication , the DNS names are used so only as a convenience to the user), and the time that the 32 -byte data packets need – the so -called response time. The Ping statistics should have no lost Datenpakate . Are the response times okay and that no packets are lost , then everything fits. Does not ping the other hand, is a time-out , then something is wrong with your internet connection or not pinged the site is not available.
You can also check with ping your local host by pinging the loopback address : ping localhost or ping 127.0.0.1. If then the correct response , IP is properly installed on the host, which is a prerequisite for a functioning Internet connection. Testing the Loopback guaranteed but not yet , you can also on the Internet, because it is hit by the ping to localhost , for example, not a statement about your Gateway. Ping for the IP address of your gateway. Is this achievable, at least the connection works within your network to the gateway.
Ping sends ICMP echo packets by default, four and shows the amount of time to pass the answer. If no response within a second, provides a ping time-out for the package. When you enter ping with the- t, is a Dauerping you cancel with CTRL + C: www.pcwelt.de ping -t. The time to the timeout can be increased with the- w. To ping , there are many other interesting options , two , we present here :-a resolves IP addresses to host names. -N specifies the number of ICMP packets (default is 4 ).
More information in:Sony vgp-bps9/s Sony vgp-bps9a Dell latitude d820 battery pavilion dv4000 battery
