what is subnet mask

vi/etc/ssh/sshd_config."#Port 22" to "Port 2222" or insert a line "port 2222" under "#Port 22" to set the default 22Port is modified to port number No. 2222.3. What are the common terminal tools for remote connection Linux?Answer: Putty, Xshell, SECURECRT, Xmanager, etc.4. Manually configure the IP, which configuration file needs to be modified? Change the default configuration file, which areas need to be

identified and tracked. In this way, the entire network can easily extend the network size through routers. Some products also support hosts on one port belonging to different VLANs, which is especially important in environments where the switch and the shared hub coexist. When the VLAN is automatically configured, the software in the switch automatically checks the IP source address of the broadcast infor

　　1, what is the gateway According to different classification criteria, there are many kinds of gateways. The gateway in the TCP/IP protocol is the most commonly used, where we speak of "gateways" that refer to the TCP/IP protocol gateway. What is a gateway? A gateway

So what is the gateway? A gateway is essentially a network that leads to its IP address. For example, if Network A and Network B exist, the IP address range of Network A is "192.168.1.1 ~ 192. 168.1.254 ", The subnet mask

DNS region; in WINXP, Type IPCONFIG. The software should be properly set: when the local connection of the ADSL user is restricted or there is no connection, a prompt will appear, which does not affect the internet access. The ADSL user is a dial-up Internet access and automatically allocates an IP address, if you do not want it to appear, right-click "Network N

As you know, there are usually no fixed IP addresses when dialing the internet. In addition, after the dial-up goes online, we don't need to worry about IP addresses, gateways, and DNS, because these are all set by the Telecommunications Bureau. After going online, I got an IP address. After we got disconnected, the address was reclaimed by China Telecom and provided to others. This is very similar to DHCP. The Dynamic Host Configuration Protocol se

2. Workstation can be normal to connect the main computer! If you are not sure of the above two things, please take care of it before it bothers you! Installation and setting of the main computer 1. Please determine whether there is a driver installed on the network card, and bind the TCP/IP protocol on the driver. 2. Install Wingate, wg1306.zip the WGsetup.exe, and fill in the server Name in each server, for example, SMTP server may be ms1.hine

What is the difference between the bridge mode and the NAT mode? Bridged networking (Bridging Mode)In this mode, the Virtual Operating System of VMWare is like an independent host in the LAN, which can access any machine in the network. In the bridge mode, you need to manually configure the IP address and subnet

What is ARP? How to prevent ARP spoofing technology? What is ARP? How to prevent ARP spoofing technology? First of all, what is ARP. If you enter arp-a under the Unix shell (also under 9x), your output should look like this: In

A gateway is a computer system or device that acts as a transformation task. The gateway is a translator between two systems that use different communication protocols, data formats or languages, and even architectures that are completely different. Unlike bridges, which simply convey information, the Gateway will repackage the information received to suit the needs of the intended system. The gateway can a

Martian Source/martian PacketsIn Linux, by default, packets is considered individually for routing purposes. Thus, all the routing algorithm determines where to send a packet based on this packet itself, without taking into conside Ration that the packet is a response packet of sorts.In a typical setup, this means-all outgoing traffic are going out over one interface, say, eth0 even if the I Ncoming packet

through the VirtualBox conversion and then sent out, the data receive is also first received by VirtualBox and then forwarded to the virtual host.If you do not understand, you can refer to: http://zh.wikipedia.org/wiki/network address translation.The virtual Host network parameter is obtained by default from the VirtualBox virtual DHCP Ser: IP Address

After the website on the VM host is set up, what is wrong if the host cannot be accessed? Urgent !! -- Linux Enterprise Application-Linux server application information. For details, refer to the following section. On the XP Server, I used VM6 to build the CentOS5.1 and APACHE2 MYSQL5 PHP5 environments. Run http: // 127.0.0.1/on the VM to open the webpage.

architecture hardware. On the client side, this means checking the IP address, subnet mask, default gateway, DNS settings, and so on. For network architecture hardware, it refers to the routing table and Internet gateway on the router. 　　Two, several aspects of the factors Flag information: Error messages on client machines, logon dialog boxes, and more. Period: continuous, intermittent, or occasional,

In our previous studies on network protocols, we found that some references are explained by combining the BOOTP protocol, DHCP protocol, and DHCP server. So what is the relationship between DHCP and BOOTP? BOOTP relay proxy BOOTP (Bootstrap Protocol) relay proxy is an Internet host or router that transmits DHCP messages between the DHCP server and the DHCP clien

Network Settings" in VMware to enable both NAT and DHCP. Generally, NAT is enabled by default, and DHCP is disabled by default.) Method 2: static IP address. If you do not want to use DHCP, you can also manually set the IP address to the same network segment as vmnet8 and the Gateway to the Gateway of vmnet8 (the Gateway can be found on the Net tab in "Virtual Network Settings) usually xxx. xxx. xxx.2. The

back of the two-bit set themselves, as long as not with the LAN and other computer IP is OK. The default gateway is: 255.255.255.0, the subnet mask is: 192.168.1.1, the subnet mask

subnets is always twice the number of nodes in a row or column. If the subnet can only be divided vertically (n is an even number), then bisection bandwidth = 2*m If only the subnets (M is even) can be divided horizontally, then bisection bandwidth = 2*n If vertical/horizontal subnetting

/static IP: Double-click the Network Connections icon in Control Panel, and then right-click the appropriate network card, such as wireless network connection, select Properties, and then choose Internet Protocol (TCP/IP) in the open window , click the Properties button below. and select the "Automatically obtain IP address" and "Automatically obtain DNS server addresses" entry in the window that opens again. Click the Alternate Configuration tab, and then select the User Configuration item in

. Is OSPF a pure link protocol?1) a single region is a pure Link Status Protocol;2) when there are multiple regions, the routing between regions uses the distance vector algorithm. 6. What is the meaning of DR election in OSPF? What is