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This article describes the basic working principles of routers in TCP/IP networks and introduces several functions of IP routers, the static and dynamic routing protocols, as well as the concepts of the internal gateway protocol and the external gateway protocol are given, at the same time, the most common RIP, OSPF, BGP and BGP-4 routing protocols are briefly introduced, and then the design objectives and types of routing algorithms are described, th

include IP, IPX, and appletalk. IP is the cornerstone of Internet. In the TCP/IP protocol system, other third-level auxiliary protocols include ARP (Address Resolution), RARP (Reverse Address Resolution), and ICMP (internet packet control) and IGMP (Group Management Protocol. Because all network interconnection devices have the path selection function, we often discuss the rip, OSPF, and other routing protocols at this layer. Exchange When talking a

LVS Nat Model Creation I. Nat model topology of LVS When a client requests a message, director is used to change the target IP address for forwarding. (When directed ctor, the target IP address is changed from VIP to rip, but when the request message is sent from Director, it is still sent from the interface of the NIC where the dip is located .) Packet Flow Direction: 1-> 2-> 3 The source address of 1 is CIP, and the target address is ctor's VIP. The

routing Protocol used within an autonomous system. (RIP, OSPF)• External Gateway Protocol EGP (External Gateway Protocol ). The routing protocol used between autonomous systems. BGP-4)• Working Principle• RIP is a distributed routing selection protocol based on distance vectors.• The RIP Protocol requires that every vro in the network maintain a distance record

MLD Status and configuration informationMSDP MSDP Status and configuration informationMulticast multicast configurationNAT address Translation status and configuration informationNQA Display NQA InformationNtp-service NTP Network Time serviceOAP operation of Open application platformOSPF OSPF routing protocolPim PIM status and configuration informationPKI PKI InformationPolicy-based-route Status and configuration information for Policy RoutingPort Display Ports InformationPort-isolate Isolation

inaccessible. Every 30 seconds, the distance vector routing protocol sends the entire route selection table to the adjacent site to update the route selection table of the adjacent site. In this way, it can collect a list of networks from other sites (directly connected or connected in other ways) for route selection. Distance Vector Routing uses the number of hops as the metric value to calculate the number of routers that need to pass to the destination. For example, r I p uses the B e l m a

/30 networks is set to 192.1.0.65. Because the Serial 0 address on Router1 is 192.200.10.5 and 192.200.10.4/30 belong to a directly connected network, there is a path to access 192.200.10.4/30, so you do not need to add a static route on router1. Router1: ip route 192.1.0.64 255.255.255.192 192.200.10.6 Router3: ip route 192.1.0.128 255.255.255.192 192.1.0.65 ip route 192.200.10.4 255.255.255.252 192.1.0.65 At the same time, because Router3 is no longer connected to other route

6th. TCP/IP routing protocol fault handlingFirst, the default gatewayWhen the destination address of the package is not in the router's routing table, such as when the router is configured with a default gateway, it is forwarded to the default gateway or discarded.show IP route; View the default gateway for Cisco routersSecond, static and dynamic routingThird, processing k_protocal/04937.htm "target=" _blank ">rip faultRIP is the distance vector routi

relatively complicated. To determine the optimal route, the routing algorithm must start and maintain the route table containing route information. The routing information varies depending on the routing algorithm used. The routing algorithm fills in different information collected in the routing table, and tells the router about the relationship between the destination network and the next stop (nexthop) according to the route table. The router interconnection information is updated, and the r

[Quidway] display IP Route display route information [Quidway] sysname aabbcc change the Host Name[Quidway] Set password for super passwrod 123456[Quidway] interface serial0 entry interface[Quidway-serial0] IP address [Quidway-serial0] Undo shutdown activation Port[Quidway] link-Protocol HDLC binding HDLC Protocol[Quidway] user-interface vty 0 4[Quidway-ui-vty0-4] Authentication-mode password[Quidway-ui-vty0-4] Set Authentication-mode password simple 222[Quidway-ui-vty0-4] user privilege level 3

nodes, that is, as the client Access portal, is also the client's access to the node to respond to the exit, the network address as the entire cluster VIP address, the intranet address and the backend server real Server on the same physical network, Real server must use a private IP address.Packet Flow Analysis The user sends the request to the Director Server, the requested data message (the source IP is CIP, the destination IP is the VIP) reaches the kernel space. Kernel space to

be directly attached to download. Director first script: Cat/etc/init.d/director #!/bin/sh # LVS script for VS/DR # chkconfig:345 # Description:lvs DR # # Processname:director #. /etc/rc.d/init.d/functions vip=192.168.88.120 rip1=192.168.88.129 rip2=192.168.88.134 PORT=80 # case ' in start '/sbin/ifconfig eth1:1 $VIP broadcast $VIP netmask 255.255.255.255 UP/SBI N/route add-host $VIP Dev eth1:1 # Since This is the Director we must do able to forward packets echo 1 > /proc/sys/net