linux routing tutorial

First, the main data structure of the middle of the Linux kernel struct Fib_result: Returns the structure after lookup of the routing table, its contents are not simple to contain the next hop information, and contains other features, such as Policy routing required more parameters. struct Fib_rule: Represents a rule that is routed by policy to select a

MD5 hash values, partial IP and TCP headers, and payloads by using preshared keys. The MD5 hash is then stored as a TCP option field. After the package is received, the receiving router uses the preshared key to generate its MD5 version in the same way. It compares its MD5 hash with the value of a packet received to decide whether to accept the package. It is almost impossible for an attacker to guess the checksum or its key. For BGP routers, they can ensure the legality of each package before

to re-enter the preceding command once. Therefore, to ensure that the system can be set automatically every time, you can use the VI editor to open the/etc/sysctl. conf configuration file. Add the following content to the configuration file: Pai_ipforward = 1 After saving and exiting, you do not need to reset kernel IP Forwarding every time you restart the system. After the kernel IP forwarding function is enabled, we should add the routing function

Maybe you know how to use the netstat or route command on Linux to find (or even add/delete) existing routes. However, when you perform these operations, you may not know how IP routing works. This article will help you understand the principles of IP routing and how it works. IP routing involves forwarding IP data pac

The basic strategy of Linux Policy Routing refers to the routing of IP packets based on the policies set by the network administrator. For example, we can have A policy like this: "select X path for all packages that come directly from Network A; select Y path for others", or "select path F for all packages whose TOS is; other selected paths K.

, Fn_hash) {if (F->fn_key! = k) Continue;err = Fib_semantic_match (f->fn_alias, FLP, Res, F->fn_key, Fz->fz_mask, Fz->fz_order); Err Fib_node structure represents a subnet, where the same subnet mask subnet to hash the algorithm is relatively simple, here do not say, when the target host matching subnet, that is Fib_node->fn_key = = DST mask, as if the goal is to achieve, has found a representative of the target subnet of the route entry, take out the next and the network card exit, you can be

Is Anza by the table fast? Or check the socket hash table fast? This is not the root of the problem. The root of the problem is how to use the two effectively, making the two partners rather than competitors. What's going on?We know that if a packet is to arrive locally, it will go through two lookups (temporarily regardless of Conntrack): The IP layer finds the Routing and Transport layer to find the socket. How to merge the two.The

In my work, often encounter servers and other servers, switch docking, currently there are several scenarios, the relevant configuration and attention points summarized, so that later to view the reference. One NIC interface with multiple IP addresses One NIC interface is divided into multiple VLANs Multiple NIC interfaces aggregated into one link Multiple network cards correspond to multiple routing tables

rule-del: Delete a routing rule-Net: The destination address is a network-Host: Destination address is a mainframe-Target: Destination network or host-netmask: netmask for Destination Address-GW: Gateway through which routed packets2) Example Description* Routes added to the host* Routes added to the network* Add default route* Delete Route3) set up packet forwardingIn CentOS, the default kernel configuration already includes the

Linux traditional network configuration command and ip advanced routing command-Linux Enterprise Application-Linux server application information, the following is a detailed description. Knowing how to configure network commands is a must-have technique for general technicians. After some time of research and study, I

1. Open Start Menu-run-Enter cmd, then click OK2. Enter the command to add a route in the following interface: Route add needs to divert IP mask 255.255.255 local export IP. The following is an example of the need to shunt IP 8.8.8.8, local export IP192.168.0.1. (Enter the command after entering the key, if the installation of 360 prompts, choose to allow all the operation of this program). You can add success3, confirm whether to add success, directly in the following input command: route print

different local area networks, of course, it also has another function, that is to distinguish the same LAN in different host (PRO, a LAN can have a lot of hosts Ah, of course, to distinguish). 2.IP Address(1) IP address and dotted decimal notationThe computer can know everything else is a binary number, so the actual IP address is a 32-bit binary number, just for us to look more easy to distinguish, we put it in decimal form, this method we call dotted decimal, as follows:650) this.width

Each access to the Laravel will boot to the routes.php file A route is usually given to a controller to handle Controller 1. Create a Controller' PHP artisan make:controller controllername 'Note: ' PHP artisan make:controller controllername–plain ' does not carry a custom method2. Using a controllerRoutes:Route::get('/','SitesController@index');Sc: publicfunctionindex() {return"sjming"; } 3. Parameter passing(1) Single value:Sc: publicfunctionindex() {$name'sjming'; return view(

Manually specify a route exit that points to a specific next-routing or gateway, which is a routing information that is manually configured by the user or network administrator. When the topology of the network or the state of the link changes, the network administrator needs to manually modify the relevant static routing information in the

Configure: Turn off the firewallLINUX1 Address 1:192.168.10.10/24 address 2:192.168.20.10/24 (do not specify a gateway, as a route, you are the gateway)LINUX2 Address 1:192.168.20.20/24 address 2:192.168.80.10/24 (do not specify a gateway, as a route, you are the gateway)Win2003 Address: 192.168.10.100/24 Gateway 192.168.10.10WinXP Address 1:192.168.80.100/24 Gateway 192.168.80.10I. Enabling the Linux routing