= "Wkiol1bc3gvsgrk3aaaxogc7-be056.png"/>1. View the corresponding IP via MAC addressRun Show ARP | Include Mac_address650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M00/7C/F1/wKioL1bdF7bjyfugAAANVIzMq9E942.png "title=" Qq20160307135242.png "alt=" Wkiol1bdf7bjyfugaaanvizmq9e942.png "/>The timeout cleanup time for Arp and Mac two tables is not the same. Use Switch#clear Arp-cache to clear the ARP info
Assume that the first 23 ports of vswitch A are connected to 23 computers and the MAC addresses are A1 to A23. The 24th ports of vswitch A are cascade with the 1st ports of vswitch B, after the MAC address of the system is learned, in the worksheet of Switch B, the 23
"hard" operations on network devices. The security factor is high, but the obtained information is not accurate. For example, if the IP address of a server has been changed, we can think that the server is not connected to the network because the original IP address cannot be found on the switch. The system administrator first checks the IP address information on the server, and then finds out which port of the switch the IP address is located on. The information obtained by this method is very
User Access Verification
Password:
Idc-3750g-12s-01>ping 192.168.50.47
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.50.47, timeout is 2 seconds:
!!!!!
Success rate is percent (5/5), round-trip Min/avg/max = 1/1/1 ms
Hc-3750g-12s-01>sh ARP | In 192.168.50.47
Internet 192.168.50.47 2 0030.4825.4441 ARPA Vlan50
Idc-3750g-12s-01>sh mac address-table Dynamic address 0030.4825.4441
Mac uses masscan to scan ports. I think the scanning effect is between nmap and zmap.
Download, decompress, cd, and make. Then, copy the executable file masscan in the bin to/usr/local/bin for convenient calling.
Root permission execution
Masscan-p 80 8/16 ..-oX mas. log
The scan results are satisfactory. It takes about half an hour and it is faster than nmap. It is much slower than zmap, probably becau
Mac OS X requires root privileges to bind port 80, but if you start eclipse or Tomcat with root, the various files created by the startup are root and cannot be deleted by ordinary users.To do this, we can do the network layer port forwarding through the pfctl, so that the connection to the native 80 port of the request, are forwarded to 9090 port; (Note that Mac OS uses 80
Although the notebook computer is small in size, easy to carry, very suitable for traveling or travel when used, but if it is used at home, perhaps many users will feel that the computer screen is too small, if the home has redundant monitors, then can be connected to a large screen notebook use, at this time need to be related to the notebook settings, There are also different ways to set up an external monitor on different brands of computers and systems, and the following is an introduction t
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