nat for dummies

The description and solution of the problem is still an old problem. Nat configured with Iptables in a Linux system cannot be used in a two-way communication environment, and you cannot configure a NAT rule to do NAT for traffic that is actively initiated in two directions, there are several scenarios for solving the problem:1. Configure two

With the rapid development of Internet network, the shortage of IP address has become a very prominent problem. In order to solve this problem, there are many solutions. The following are some of the more effective ways to address translation (NAT) in the current network environment. Nat settings can be divided into static address translation, dynamic address translation, and multiplex dynamic address conv

1. NAT Overview NATNetwork Address Translation) the network Address Translation function is to convert an illegal IP Address defined within the enterprise to a legal IP Address recognized on the Internet. Due to the limitation of IPv4, the Internet is facing a shortage of IP address space. It is unrealistic to apply from the ISP and assign a valid IP address to each employee of the enterprise. NAT can effe

Bkjia.com exclusive: basic syntax of Iptables (better understanding of the gateway NAT script later ): Iptables [-t table name] INPUT chain: when a data packet is determined as a local Linux system by route computing in the kernel, it will pass the INPUT chain check. OUTPUT chain: the data packet generated by the system. FORWARD chain: data packets routed through the Linux system (that is, when the iptables firewall is used to connect two networks,

Before talking about the VMware network model, let's talk about several VMware Virtual Devices: Vmnet0: This is the virtual switch used by VMware for virtual Bridging networks; Vmnet1: This is the virtual switch used by VMware in the Virtual Host-only network; Vmnet8: This is the virtual switch used by VMware for virtual Nat networks; VMware network adapter vmnet1: This is the virtual Nic used by the host to communicate with the host-only virtual

let's start by talking about several VMware virtual devices VMnet0: Virtual Switches for virtual bridging networks VMNET1: Virtual Switches for virtual host-only networks VMNET8: Virtual Switches for virtual NAT Networks VMware Network adepter vmnet1:host Virtual network adapters for communication with host-only virtual networks vmwarenetwork adepter vmnet8:host virtual NIC for communication with NAT virtua

I. Requirements , Provincial, municipal, and county routers. County-level routers have routes to the municipal and provincial levels, but the municipal and provincial levels do not reach the county-level route information, which will cause the packages sent by the county level to reach the municipal or provincial routers, however, the data packet is lost because the path cannot be found at the time of return. County-level router R1 is required to access municipal and provincial routers through

application of some global IP address, in many cases is not easy to do, Because the address of the global IPv4 is not much left. The most current method used is to use network address translation.The Network Address translation Nat method was proposed in 1994. This approach requires the installation of NAT software on a router that has a private network connected to the Internet. A router with

Linux implements nat forwarding and internal port ing, linuxnatNat forwarding and internal port ing in linux Dual NIC: Host Eth0: 114.114.114.114 (public ip) eth1: 192.168.1.1 (intranet ip) Pc1 Eth0: 192.168.1.2 (intranet ip) eth1 (dialup ip) Pc2 Eth0: 192.168.1.3 (intranet ip) eth1 (dialup ip) 1. Configure the NIC information of the host machine Vim/etc/sysconfig/network-scripts/ifcfg-eth1 TYPE=EthernetBOOTPROTO=staticDEFROUTE=yesPEERDNS=yesPEERROUTE

VMware offers three operating mode bridging (bridge), NAT (network address translation), and host-only (host mode). Bridging modeIn bridging mode, VMware's virtual operating system is like a standalone host in a local area network (hosts and virtual machines are in a peer position), and it can access any machine on the network. In bridge mode, we often need to configure the virtual host IP address, subnet mask, etc. (note that the IP address of th

conversion is 202.99.160.2. Requires that the internal URL 10.100.100.1~10.100.100.254 be converted to a legitimate IP address of 202.99.160.2. The first step is to set the external port. Interface F0/1 IP address 202.99.160.1 255.255.255.0 In Nat outside The second step is to set the internal port. Interface f0/0 IP address 10.100.100.1 255.255.255.0 IP nat Inside The third step is to define a legitimate

There is a alloc_null_binding function in the NAT module of Netfilter. This function will be called at the hook point local_in and when Nat is not initialized, in both cases, netfilter requires that SNAT can be executed in postrouting and local_in. However, during local_in, the destination address of tuplehash [ip_ct_dir_reply] is the local machine, and the conversion source address is meaningless, therefor

CISCO PT Simulation Experiment (19) NAT feature configuration for routersExperimental Purpose :Mastering the principle and function of NAT network address translationMaster the configuration of static NAT to achieve LAN access to the InternetMastering the principle of wide area network (WAN) access technologyExperimental Background : in order to adapt to the comp

202.203.230.0 Mask 255.255.255.0 202.203.230.1 3. Client Configuration TCP/IP configuration is as follows: ip:192.168.1.x, subnet mask: 255.255.255.0, Gateway: 192.168.1.1, preferred DNS server: Local ADSL domain name server IP (can be queried to the ADSL provider, such as Kunming Telecom is: 202.98.160.68), alternate DNS server: 202.203.220.2. The DNS settings here are critical, and some people mistakenly set DNS to: 192.168.1.1. Third, summary Using this method to achieve broadband sharin

NAT analysis (intranet users access the server through domain names) 1. environment hypothesis: the private network address of the Intranet server is 192.168.2.20., port 80 of the server is mapped to port 80 of port 202.101.1.1, and the domain name www.sina.com is applied. The IP address of the Intranet PC is 192.168.2.2, now we configure the following command on the Internet port of the router: sys acl number 2000 rule permit source 192.168.2.0 0.0.2

One:Router (config) #enRouter (config) #conf tRouter (config) #access-list 1 Permit 192.168.1.0 0.0.0.255 Establish access Control List prepare for NAT conversionRouter (config) #ip nat inside source List 1 Interface f0/1 establish NAT translation, convert 192.168.1.0 Address to interface addressRouter (config) #int f0/1 #进入接口模式Router (config-if) #ip

I. OverviewThe English full name of NAT is "network address translation", which is an IETF (Internet Engineering Task Force, Internet Engineering Tasks Group) standard that allows aThe overall organization appears on the Internet with a public IP (Internet Protocol) address. As the name implies, it is a technology that translates the internal private network address (IP address) into a legitimate network IP address.

Tags: cannot external standalone only DNS application the extranet user 1. Overview 2, bridged (bridge mode) 3. NAT (network address translation mode) 4, Host-only (host mode) 5. Replicate Physical network connection state option explained 1. OverviewAfter the installation of the virtual machine, the default installation of two virtual network cards, VMnet1 and VMnet8, such as. Where VMnet1 is the host network card for th

1. Bridging modeIn bridging mode, VMware's virtual operating system is like a standalone host in a local area network (hosts and virtual machines are in a peer position), and it can access any machine on the network. In bridge mode, we often need to configure the virtual host IP address, subnet mask, etc. (note that the IP address of the virtual host and host IP address in the same network segment). The relationship between a virtual system and a host using bridged mode is like two computers con

networking between Windows and Linux virtual machines for SSH remote connectivity and VMware's 3 network modes [NAT, bridging, and Host-only]Tian QiOne, the network between Windows and Linux virtual machine for SSH remote connectionIf we were to configure an IP address for a virtual machine with host name MINI1, the following steps are required:To view the IP address on Linux, if the Linux server has an IP address, let its IP address and Windows IP ad