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query order of the host name. DNS is required to resolve the domain name, and then query the "/etc/hosts" file (or the opposite ). "Multi on" specifies whether the host specified in the "/etc/hosts" file can have multiple addresses. a host with multiple IP addresses is generally called a multi-point host. "Nospoof on" indicates that IP address spoofing is not allowed on the server. IP spoofing is a means of attacking system security. by disguising IP addresses as other computers, you can gain t

hostname real_ip vip gateway OSMaster node2 192.168.32.32/24 192.168.32.22/24 192.168.32.254 rhel5.5Slave node3 192.168.32.33/24 192.168.32.22/24 192.168.32.254 rhel5.5Ii. installation and configuration1. Installation[Root @ node2 ~] # Tar-zxf ucarp-1.5.tar.gz # ucarp it is best to choose a version above 1.2, less than 1.1 contains bugs[Root @ node2 ~] # Cd ucarp-1.5[Root @ node2 ucarp-1.5] # which gcc # determine gcc/Usr/bin/gcc[Root @ node2 ucarp-1.5] #./configure CC =/usr/bin/gcc -- prefix =

content of the current route table. # Route [-nee] # Route add [-net |-host] target host or network [netmask] [gw | dev] # Route del [-net |-host] target host or network [netmask] [gw | dev] -N: The address is displayed as a numeric address instead of an interpreted host name. This is very useful for detecting the cause of your failure in the route to the Domain Name Server. -Ee: a large amount of inform

Ip address planningPc0 vlan 2 192.168.2.2/24 gw 192.168.2.1Pc1 vlan 3 192.168.3.2/24 gw 192.168.3.1Pc2 vlan 2 192.168.4.2/24 gw 192.168.4.1Pc3 vlan 3 192.168.5.2/24 gw 192.168.5.1R1 f0/0.1 192.168.2.1/24R1 f0/0.2 192.168.3.1/24R1 f0/1 10.1.1.1/24R2 f0/0 10.1.1.2/24R2 f0/1 11.1.1.1/24R3 f0/0 11.1.1.2/24R3 f0/1.1 192.168

Address 10.35.0.58 Netmask 255.255.255.0 Iface eth1 inet static Address 222.76.250.4 Netmask has been released successfully Gateway 222.76.250.1 Auto eth1 Note: We didn't set gateway for eth0 (internal network). After the modification is complete, we use Ctrl + O to save the modification, and then press Ctrl + X to exit the editor. 2. At this time, we restart the network. The command for restarting the network of Ubuntu is: Sudo/etc/init. d/networking restart 3. Because no intranet gateway is s

give you a shot.At the beginning of the first chapter, the author will introduce the DNS policy in the location-based quarantine traffic access, I will design a scenario, assume that Contoso is a book company, respectively, in Dalian and Weihai with branch offices, the company has an office site, Dalian and Weihai employees need to visit, In the past through DNS polling to achieve load balancing, sometimes Dalian people often access to the server in Weihai, resulting in an access delay, in Wind

PHP executes Linux commands # vim/etc/rc.d/rc.local Route add default GW 192.168.0.255 eth0 Route add-net 10.0.1.0 netmask 255.255.255.0 GW 192.168.0.255 eth0 : Wq I know PHP calls the System bottom command with exec but want to know how to execute the three sentences at the same time? ------Solution-------------------- We're also doing a route recently, and we're doing this by writing the file into

Because the system needs to access the server separately from the Intranet, that is, the Internet users access the server from the Internet, and the Intranet users access the server from the Intranet, the result is that the Intranet cannot be accessed after the dual gateway is configured, use the route command to view the cause of the route problem and reset the route to solve the problem. To avoid routing problems after the server is restarted, add/etc/rc. Local in the configuration file. r

names, listing faster than route)Example 2: Add a gateway/set up a gatewayCommand:Route add-net 224.0.0.0 netmask 240.0.0.0 Dev eth0Output:[Email protected] ~]# Route add-net 224.0.0.0 netmask 240.0.0.0 Dev eth0[Email protected] ~]# routeKernel IP Routing TableDestination Gateway genmask Flags Metric Ref use Iface192.168.120.0 * 255.255.255.0 U 0 0 0 eth0192.168.0.0 192.168.120.1 255.255.0.0 UG 0 0 0 eth010.0.0.0 192.168.120.1 255.0.0.0 UG 0 0 0 eth0224.0.0.0 * 240.0.0.0 U 0 0 0 eth0Default 192

simplify the code."4" compared to STM32 official example. The checksum-related configuration is removed using software verification. STM32 in the official case of the MCU using the Code EMAC function, this series of MCU contains hardware check function, but enc28j60 does not have this function, so only can turn on the software check function in lwIP. 3.LwIP related initializationvoid Lwip_config (void) { struct ip_addr ipaddr; struct IP_ADDR netmask; struct IP_ADDR

1. Environment Fedora 16: automatically connect to the Internet through the vro, and the machine can connect to the Internet through the route. For details, refer to PacketiX. NET vpn client installation on linux.The previous steps in this document are correct. Due to some routing configuration problems, the VPN Server cannot be connected according to its configuration. Therefore, do not execute dhclient vpn_o and configure the network by yourself; 2. According to the comments from the above net

Effective immediately: Ifconfig eth0 192.168.1.102 netmask 255.255.255.0 Start effective: Vim/etc/sysconfig/network-scripts/ifcfg-eth0 Join Ipaddr = 192.168.1.102 Netmask = 255.255.255.0 Modify the Default GatewayEffective immediately:Route add default GW 192.168.1.1Start effective:Vim/etc/sysconfig/network-scripts/ifcfg-eth0JoinGateway = 192.168.1.1The final result is as follows:Device = eth0Bootproto = staticIpaddr = 192.168.1.102Netmask = 255.255.2

When adding a route, if you want it to be valid when the server is restarted, write the command to/etc/rc. Local. However, the routing operations are different in Linux and FreeBSD, with the following differences: Linux: The following is a code snippet:View routes:/Sbin/routeAdd route:/Sbin/route add-host 172.16.78.226 GW 10.55.40.1/Sbin/route add-net 172.16.20.0/24 GW 10.55.40.1Delete A route/Sbi

Reprinted: Http://blog.csdn.net/zhangyang0402/archive/2010/06/25/5695050.aspx I. Network Topology 2. Configure the network 1.Network Configuration of A, gw1, gw2, and B A: Eth0: Ipaddr: 192.168.1.2 Netmask: 255.255.255.0 Gateway: 192.168.1.1 Gw1: Eth0: Ipaddr: 172.16.113.173 Netmask: 255.255.255.0 Gateway: 172.16.113.9 Eth1: Ipaddr: 192.168.1.1 Netmask: 255.255.255.0 B: Eth0: Ipaddr: 192.168.0.2 Netmask: 255.255.255.0 Gateway: 192.168.0.1 Gw2: Eth0: Ipaddr: 172.16.113.163 Netmask: 255.2

64 bytes from 218.61.34.138: icmp_seq=2 ttl=52 time=125 ms 64 bytes from 218.61.34.138: icmp_seq=3 ttl=52 time=126 ms 64 bytes from 218.61.34.138: icmp_seq=4 ttl=52 time=110 ms --- www.linuxsir.org ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3003ms rtt min/avg/max/mdev = 103.513/116.329/126.598/9.856 ms tony@tonybox:~$ 5.2 route The route program operates on the kernel's IP route table. It is mainly used to spe

The network configuration is related to the kernel module. ================ Network configuration ================ Network parameter settings: 1) The command line setting can take effect immediately, but all the settings will become invalid after the computer is restarted;2) modify the system configuration file, which does not take effect immediately, but can be permanently saved;==== Set network parameters in the command line1. network interface parameter ------- ifconfig commandIfconfig eth0 1

Linux automatically installs service components and optimizes kernel parameters.Install LInux bare metal (installation please refer to: http://blog.itpub.net/26230597/viewspace-1380155/), but also need to install some basic components on it, generally manual installation one by one, more complex may be omitted, below sorted out, make a script. Each time you run the script, you have installed the basic components and optimized the Linux kernel parameters.1. Configure the network first and check t

is not allowed on the server. IP spoofing is a means of attacking system security. By disguising IP addresses as other computers, you can gain the trust of other computers. */Etc/sysconfig/network File This file is used to specify the network configuration information on the server. The following is an example: NETWORK = yes RORWARD_IPV4 = yes HOSTNAME = deep.openarch.com GAREWAY = 0.0.0.0 GATEWAYDEV = NETWORK = yes/no Indicates whether the network is configured; FORWARD_IPV4 = yes/no Enable IP

more complicated point: 12 auto eth013 iface eth0 inet static14 address 192.168.1.4215 Network 192.168.1.017 netmask 255.255.255.12818 broadcast 192.168.1.019 up Route add-net 192.168.1.128 netmask 255.255.255.128 GW 192.168.1.220 up route add default GW 192.168.1.20021 down Route del Default GW 192.168.1.20022 down Route del-net 192.168.1.128 netmask 255.255.25

Ifconfig commandIfconfig-aIfconfig eth0 [Up|down]Ifconfig eth0 172.16.6.14/16 [up]Ifconfig eth0 172.16.6.14/16 (16 subnet mask length)Ifconfig eth0 172.16.6.14 netmask 255.255.0.0Note: effective immediately.Enable promiscuous mode: [-]promiscRoute commandRouting Management CommandsView Route-nAdding a route addRoute add-host 192.168.1.44 GW 172.16.6.1 Dev eth0 (destination host routing)Route add-net 192.168.0.0 netmask 255.255.255.0