vpn routing and forwarding

-EC routing protocol (RIP, OSPF, BGP, etc.) Announcement to CE, CE route calculation, add these routes to the global routing table, such. LDP distribution label:First, the PE1 global route table contains a direct connection route of 1.1.1.1/32, and then LDP distributes tags for all IGP routes. Because it is the last hop, a special label 3 is distributed. (Please note that, the table I wrote above cannot be

"1"/sbin/iptables-i input-s 45.61.255.176-j ACCEPT/sbin/iptables-i input-d 45.61.255.176-j ACCEPT/sbin/iptables-i input-s 23.27.6.15-j ACCEPT/sbin/iptables-i input-d 23.27.6.15-j ACCEPT/sbin/iptables-t nat-i prerouting-d 23.27.6.15-j DNAT--to-destination 45.61.255.17610/sbin/iptables-t nat-i postrouting-d 45.61.255.176-j SNAT--to-source 23.27.6.15/sbin/iptables-t nat-i postrouting-s 45.61.255.176-j SNAT--to-source 23.27.6.15"2" Modified/etc/sysctl.conf file# Controls IP Packet forwardingNet.ipv4

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One. Experimental network topology(R1,R2 is implemented by adding a dual NIC to the Linux virtual machine for soft routing)650) this.width=650; "Src=" http://www.178linux.com/users/lin/appdata/local/ynote/data/ldt195175108@163.com/ 6455c7c014454a9a8dfa57ecdde48431/d5b5b5ed3efa4c9d8fa982b268b1f3f8.jpg "style=" Height:auto;vertical-align:middle ; border:0px; "alt=" d5b5b5ed3efa4c9d8fa982b268b1f3f8.jpg "/>650) this.width=650; "src=" Http://www.178linux.c

CCNP Study Notes 2-routing part-VPNReview the dynamic protocol: rip vpn ospf encapsulation UDP 520 IP 88 IP 89 update address 224.0.0.9 224.0.0.10 224.0.0.5/6 use passive to implement intercommunication between the two ends of unicast neighbor and the output interface to implement unicast NBMA point to multicast unicast key complete neighbor update methods, timing 30 seconds 15% offset, trigger incremental

Let's take a look at an article about CentOS installation VPN pptpd firewall iptables forwarding settings, this problem is because a friend set up some of the Web site can not be accessed when the solution came up. CentOS installation VPN appears some of the site can not access the problem! Some forwarding rule setting

CentOS installation VPN appears some of the site can not access the problem! Some forwarding rule settings for iptables The NAT conversion rule is established, otherwise the dial cannot be connected to the public network through the remote gateway. Iptables-t nat-a postrouting-o eth0-j snat–to-source $src _ip Centos 6.4 Installing VPN problems with some Web si

Soft routing is an additional feature of PacketiX VPN.PacketiX VPN has always been used as a selling point as a professional VPN product. In addition to this function, PacketiX VPN can also be used as a soft route, this function is very similar to Microsoft's [Routing and Re

$ fixed entry connecting to the internal network-M conntrack -- ctstate New-d $ DST/$ dst_mask-J mark -- Set-mark 100Iptables-T mangle-A prerouting-I $ connect to the internal network fixed entry-M conntrack -- ctstate established-S $ src/$ src_mask-J mark -- Set-mark 100 Configure a Policy Routing Policy: IP rule add fwmark 100 table VPN Add a route entry to the policy

forwarding address does not passContinue Next forwarding Addressif (!key->oif | | key->oif = = nh->nh_oif) match the forwarding address of the output deviceBreak Match success}#ifdef Config_ip_route_multipath multipath Routingif (Nhsel Res->nh_sel = Nhsel; Output forwarding Address numberAtomic_inc (AMP;FI-GT;FIB_CLNT

route table. Compared with RIP, IGRP has a longer convergence time, but the bandwidth required for transmitting route information is reduced. In addition, there are no blank bytes in the IGRP grouping format, which improves the message efficiency of IGRP. However, IGRP is proprietary to Cisco and is only applicable to Cisco products. China site With the expansion of the network scale and the growth of user requirements, the original IGRP has been unable to cope with the problem, so Cisco has de

It's common knowledge that all the Cisco devices currently using the IPSec protocol to establish a VPN site is not the use of routing, or the use of GRE technology, GRE over IPSec can achieve routing, but that configuration complex does not say that, due to 2 of the package, the payload of each packet is much smaller, efficiency is not good. Also can only say at

according to the "instructions". Similar to the address information table of the vswitch, the place where the "indication" is stored on the vro is called a forwarding table. 3. Relationship between two tables 3. 1. Contact The forwarding table directly acts on data packets, while the route table is the basis for generating the forwarding table. The

host. The use of specific host routing makes it easier for network managers to control network and test networks, as well as to take this particular host route when a security issue needs to be considered.Routers can also take a default route to reduce the space used by the routing table and the time it takes to search the routing table. This kind of

Original address: http://blog.51cto.com/13683137989/1880744 Introduction of the preface: The IP address is divided into public IP addresses and private IP addresses, which are owned by Inic (Internet Network Information Center), which are assigned to the organization that registers and applies to inic. Private address is not registered, but is used exclusively within the organization. Private addresses are not directly used to communicate with WANs, either by using frames to communicate (Fre Fr

generic.CPU as a general execution unit, it is completely stupid, but what can do, specifically what to do, is to be obtained from the memory of the "instructions" to indicate, that is, the instruction itself is a form of data, programming is the nature of what? The essence of programming is programming the internal circuitry of the CPU with instructions obtained from memory.However, for hardware forwarding, its input is a IPV4 address, purely a data

as long as the a Few simple routing entries are added to the Linux host, which can act as a simple router. in the actual production of the bad environment, when we need a router as simple as forwarding data, but without a router on hand, we can designate a single The Linux host acts as a simple router, enabling simple forwarding of routes. the above-mentioned co

only generic.CPU as a general execution unit, it is completely stupid, but what can do, specifically what to do, is to be obtained from the memory of the "instructions" to indicate, that is, the instruction itself is a form of data, programming is the nature of what? The essence of programming is programming the internal circuitry of the CPU with instructions obtained from memory.However, for hardware forwarding, its input is a IPV4 address, purely a

A router is the main node device on the Internet. The router determines data forwarding through routing. The forwarding policy is called routing selection and the origin of the router name. the position and function of the router in the network determine that it must be able to interconnect multiple different networks.

0.0.0.0 255.255.255.0 U 0 0 0 eth1169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth10.0.0.0 192.168.16.1 0.0.0.0 UG 0 0 0 eth0Enables routing and forwarding of the server core with routing capabilities# echo 1 > /proc/sys/net/ipv4/ip_forward# 或者使用下面的方式# sysctl -w net.ipv4.ip