One of the specific applications of routing technology in the enterprise (static, default Nat and static floating routing)

today will bring you a new technical introduction series, the name of this series is called "Routing technology in the enterprise's specific application" This is the first article series, "Static routing, default route NAT and static floating routing "

I think when you see these nouns, you will not be unfamiliar, whether you are learning Cisco Certification system ( Ccna-ccie) , or to learn the Huawei Certification system (Hcna-hcie) friends may be in the beginning of contact, or learn the network, or obtain these certified friends have this idea.

 in class, the teacher said it. The teacher's order knocks quickly, and when the command is finished, come to aPING. Ask the classmate,. Let's see it through. : "Pass" the students said in unison,OK. Good. Pass. The next experiment begins. In this way, a test of the past, after the finished. Some friends have already passed theCCNP.HCNPThis kind of certification, but there is still a little doubt. What is going on in the course of these techniques? To work in the unit. How exactly are these technologies going to work? To learn these techniques,RIP,Ospf,ec. NATWait, these are the problems that are solved in the unit? Of course, is a friend who has worked experience, Party B (System integration engineer) This is needless to say, it is estimated that the party (Enterprise network Management) may not be very clear. So I'm going to introduce you today..

Before the beginning of the article, first review the basic concepts, of course, this basic concept I will not say so detailed and professional. I will only be very simple to use the words I want to express to explain. Want to know more, more professional please feel free to go online to find a lot of information can be consulted.

1. What is the function of the router?

depending on the routing table in the router, the data is "polled" - forwarding "The routing table has a routing bar for the purpose, according to the path to the data forward, if there is a default to go by default, if any one of them will be discarded."

2. What is a routing table? How is the routing entry in the routing table generated?

a summary table of routing entries in a router, called a routing table. The entry in the routing table is generated in 2 ways, the first is manually added to the static routing table. The second is the automatic generation of the device called the Dynamic routing table, the way to generate a dynamic routing table is called the Routing protocol (rip,ospf,bgp,eigrp. Is-is).

3, What is NAT , NAT Concepts and configuration steps

NAT Address conversion Technology, the private network IP Convert to public network IP the technology, because only the public network IP address is routed to the Internet.

in the introduction NAT before you configure the steps, you need to look at a picture

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There's a concept here.

1.nat-inside ( called by Cisco) nat-inbound ( Huawei)

What does this mean, this means that relative to the network boundary device (router, firewall) inside the router, is commonly known as the routerLANthe mouth is called "inside"or"Inbound"Outside the device directly connected to the external network, which is commonly known as routersWANPort, (this routerLANMouth andWANmouth, I will not say more, as long as it is configured over likeTp-link,d-linkFriends of this kind of home router are known) called "outside"or"Outbound"

2. configuration steps:

The first step is to do the ACL, which means defining the private network address segment within the unit that needs to be transformed. For example, internal units have2a private network segment,192.168.1.Xand the192.168.2.X, now this2of the network segmentPCmachine needs to be able to sisu the net, first you need to define aACLlet this2of the network segmentIPAddress toNATConversions

Step Two: Define a NAT address pool, IP nat Pool fill in the public network that the operator (Telecom or netcom) gives you IP addresses, masks, and gateways.

Step Three: Apply the defined on the interface Nat Pool you can do it.

4. What is static floating routing
Static floating routes, which can also be called routing backups, are based on static routes, but instead of changing the metric to a larger scale.

5. Default route

If there are no specific and precise routing entries in the routing table, throw all the received packets to the default route.

The application is as follows:

1. Router is the unit Sisu Network (Internet)

2.NAT and the default route is used to resolve the Internet on the unit. Are configured on these devices on network boundary devices, routers, firewalls, and layer three network devices (such as layer three switches).

3. static floating routing is generally done as a route backup. More for Headquarters - division, or head office - branch. General Factory - Factory This model of total score, generally not the overall model of the Unit will not be used.

specific technical applications in the Enterprise :

( NAT, static routes and default routes): (Huawei Product solutions)

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This topology is a typical enterprise (single company, no division) topology diagram.

If you are this company's network management, or is party B (System integration company engineer) Now received this party a business, how should network, and debugging equipment?

OK , then let's start.

The first step is to tune the LAN inside the unit. In the above topology diagram is the first to the unit's PC and server configuration of the planned IP address.

Step Two: Set the unit's PC Connected to the two-layer access switch and configure the default route on the core switch, and the entire unit of the gateway. Of course, if necessary, you also need to partition the VLAN and Configure the interface of the switch.

Step Three: Configure the connected address of the switch and router connections. For example, the interface of the switch is configured as 1.1.1.1 and the switch-connected router (firewall) can be set to 1.1.1.2

Fourth Step: The public network to be applied from the operator IP address, gateway, subnet mask are configured to the router (firewall) WAN and enabled on the router (firewall) NAT

It is also important to configure static routing to the internal network segment on the router. That is, the receipt route for the data. This is sure to remember the configuration. Otherwise, the Internet is not available.

Whether you are studying the Cisco Certification system ( Ccna-ccie) , or to learn the Huawei Certification system (Hcna-hcie) friends, be sure to remember. The techniques of learning must not exist in isolation, they are interdependent and bundled together.

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One of the specific applications of routing technology in the enterprise (static, default Nat and static floating routing)