cisco network firewall

NAT, nat converts a public IP address to a private IP Address by checking the information in the NAT saved ing table, and then forwards it to the internal receiving point. Generally, for general data packets, the NAT device only needs to convert the IP address and port number. However, for applications such as H.323, sip, and MGCP, The Real Media connection information is transmitted in the packet load, which leads to problems. Assume that terminal A initiates a call to Terminal B, and the soft

Cisco NAT Network Address Translation ConfigurationNetwork Address Translation (NAT) translates private IP addresses of the internal network into the world's only public IP address, so that the internal network can be connected to the Internet, it is widely used in various types of Internet access methods and networks.

It took one night to study some people's claim that "you can use Cisco SLA to monitor a non-direct connection network down to delete a local static/default route", which I personally think is impossible. Some people's original intention should be to avoid invalid data packets forwarded by the router. Because the non-direct connection network is disconnected, the

Netfilter/iptables is integrated in linux2.4.x packet filtering firewall system in version kernelNetfilter/iptables framework enables packet filtering, network address translation, and packet management capabilitiesLinux The central firewall system consists of two parts: NetFilter and the iptables ; NetFilter in kernel space, iptables is the user tooliptables Fou

Firewall in the network application is quite common, we all know, firewall hardware firewall and software firewall. Before, the author introduced the hardware firewall principle, and recommended a few more popular enterprise hardw

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Equipment: Cisco three layer OneTP AC200 1 UnitsTP AP 2 unitsObjective: To set up multiple SSID signals, each of which is independent of one network segment, and the terminal obtains IP automatically.Difficulties encountered: According to TP description AP Port is added to the specified VLAN, while the SSID binding in AC corresponds to vid, but the wireless terminal can not obtain IP.Set up:Three-tier VLAN-

"help address"Switch (config-if) #eSwitch (config) #in VLA 20Switch (config-if) #ip helper-address 192.168.50.1Switch (config-if) #eSwitch (config) #in VLAN 30Switch (config-if) #ip helper-address 192.168.50.1Switch (config-if) #eSwitch (config) #in VLAN 50Switch (config-if) #ip add 192.168.50.254 255.255.255.0//Configure IP for VLAN50Switch (config-if) #no shSwitch (config-if) #eSwitch (config) #in VLAN 40Switch (config-if) #no shSwitch (config-if) #ip add 192.168.40.254 255.255.255.0//Configu

Label: State port so the network cannot switch port status multipleVSS uses the inter-chassis nsf/sso as the primary high-availability mechanism between the two enclosures. One Virtual Switch member chassis will be a member of the primary virtual switch, and another member will be in the hot wait state of the control Panel. The data panels for both enclosures are available, so the total traffic forwarding capability is 1440Gbps. When a virtual switch

After the new switch is bought, all need to be simple configuration to meet the unit network operation, after the configuration of the device will need to put it where it should be placed, but in the future we need to view or modify this device, we need to use remote login to configure it. Let's talk about the specific configuration of remote login.First, you need to use a dedicated configuration line (console line) to connect the deviceSecond, config

Reason: The company panel interface is not enough, through the small Fool switch expansion interface . phenomenon: Small fool switch Connection panel, then computer connection small fool switch. Found that the computers are not ping gateway, but can ping each other . Description Small fool switch is no problem, the connection between the small fool switch and the original switch fails . View the original switch configuration and find the Portfast configured . and Spanning-tree Bpduguard enable i

----------- --------------------------------------------------------GI1/0/1 Ip-mac INACTIVE-NO-SNOOPING-VLANGI1/0/2 Ip-mac Active Deny-all deny-all 24GI1/0/3 Ip-mac INACTIVE-NO-SNOOPING-VLANGI1/0/4 Ip-mac Active Deny-all deny-all 24GI1/0/5 Ip-mac Active Deny-all Deny-all 24GI1/0/6 Ip-mac Active deny-all deny-all 24GI1/0/7 ip-mac AC tive 172.16.24.150 a4:4c:c8:10:63:ee 24gi1/0/8 ip-mac INACTIVE-NO-SNOOPING-VLANGI1/0/9 Ip-mac Active Deny-all deny-all 24GI1/0/10 ip-mac IN

.ffff.ffff 4. BPDU multicast MAC address 0100.0CCC. CCCD (CISCO private ) 5. APPletalk multicast MAC address 0900.0700.0000 - 0900.07ff.ffff650) this.width=650; "Src=" Http://s4.51cto.com/wyfs02/M00/8C/03/wKioL1hfNAvz4JWhAAA66hgG89k274.jpg-wh_500x0-wm_3 -wmp_4-s_3917366929.jpg "title=" image 1.jpg "alt=" Wkiol1hfnavz4jwhaaa66hgg89k274.jpg-wh_50 "/>Experimental requirements:1. Configure the interface address. 2. Configure the VLAN. 3. Configurin

Cisco Network Tutorial: vro register configuration objective: Register configuration is used to change the vro startup process. The Start bit consists of four hexadecimal registers www.2cto.com format: 0 xABCD value range from 0x0 to 0 xFFFF 0x2102: Industrial default value 0x2142: Start from FLASH, but do not use the configuration file (for Password Recovery) in NVRAM 0x2101: Start from Boot RAM, apply to

(Terminal settings), set as follows:650) this.width=650; "src=" http://s4.51cto.com/wyfs02/M02/7D/6F/wKioL1boJrPCXJgXAAMH2q6yGAU397.jpg "title=" 13.jpg "alt=" Wkiol1bojrpcxjgxaamh2q6ygau397.jpg "/>In fact, in the "Terminal command line" option enter the following command:"C:\Program files\vandykesoftware\securecrt\securecrt.exe"/script securecrt.vbs/arg%d/t/telnet%h%pStartc:\program files\vandykesoftware\securecrt\securecrt\securecrt.exe/t/telnet 127.0.0.1%pAfter entering, click "Aplay", then c

:(1) Step 1: Configure the Router Ethernet interface IP address(2) Step 2: Configure the router password(3) Step 3: Access the router via TelnetCommands for the relevant steps:Configure the Router Ethernet interface IP address (enter the privileged mode, global mode, interface mode, and configure the Ip-> activation interface, which, by default, all of the router's interfaces are off), the effect is,650) this.width=650; "src=" Http://s1.51cto.com/wyfs02/M00/8A/C8/wKioL1g8E12B9RCSAAB9Rvv9G_Y227.j

Today we are in the Information Age, which can also be said to be the age where viruses and hackers are prevalent. This is indeed a bit pessimistic, but today's network is indeed so, from the Internet to the enterprise intranet, from personal computers to mobile phone platforms that can access the Internet, there is nothing safe. Every cyber-virus attack will make home users, enterprise users, 800 hotlines, and even operators feel a headache. However,

Today, network firewall has become an Internet service for all users, but is it possible for few users to let their network firewall really play its role? Many people do not set the functions of the network firewall and do not set

(cmd)) output = Net_connect.send_command (cmd) time.sleep (2) save.write (output) print (U ' [+ ] {0} command Executed,result is saved at {1}! '. Format (cmd,filename)) Save.close () Net_connect.disconnect () if __name__ = = ' __main__ ': print "[+] the program is running. ... "username = raw_input (' username: ') password = getpass.getpass () Enablepass = Raw_input (' Enable: ') Filepath2 = R ' c:\n Etpy\\ ' if Os.path.exists (filepath2): message = ' ok,the '%s ' file exists. ' Else:message =

Today, network firewall has become an Internet service for all users, but is it possible for few users to let their network firewall really play its role? Many people do not set the functions of the network firewall and do not set