cisco vpn protocol

communications that do not yet have an IP address, it is obvious that you can only use Mac multicast, how to route the multicast traffic received by the network card to the application, cannot rely on the protocol stack routing, because at this time the IP layer is not pass, rely on what? Rely on packet sockets!Of course, the above discussion is a bit simple, there is no IGMP and pruning and so on, in fact, for my needs, there is no need for those, w

Global debugging When configuring a Cisco router, the boundaries between global and interface commands are obvious. In this case, we use "Global" to identify commands that cannot be used for interface debugging or specific transmission media types and Protocol debugging. For example, in vrouters 2500, you can use Debugging commands to analyze the Cisco Discovery

Cisco Discovery Protocol (CDP) from the name we can see that this is a Cisco proprietary, it is recommended that everyone learn CCNA when trying to be familiar with all the spelling do not simply write down the abbreviation!CDP can collect hardware and protocol information for neighboring devicesCDP has two global para

backplane (such as Catayst 5500 and 6000). bid High-byte domain is the bridge priority, do not confuse the bridge priority and the seventh chapter "Advanced Spanning Tree." The port priority discussed, the bridge priority is a two-byte (16-bit) value, an unsigned 16 is an integer with 216 possible indications, and the range is 0-65535. The default bridge priority is the median value of 32768, which is described using the 10 binary. Note:This book covers only the version of the IEEE Spanning

RGMP: Cisco router port group management protocol (rgmp) makes up for the Internet group management protocol (Igmp: Internet group management protocol) problems in snoopIng technical mechanisms. The rgmp protocol acts between multicast routers and switches. Rgmp allows you t

1. CDP is a Cisco proprietary protocol and can only find information about directly connected devices.2. Cisco routers send CDP updates on all interfaces by default. The default Update time is 60 s and the retention time is 180 s.3. CDP messages are encapsulated in the header and tail of the data link layer. Without any layer-3

Tags: des style blog HTTP color Io AR for strong ? Simplify VLAN information library synchronization in large Campus Networks (same VTP management domain) Only synchronize VLAN Information Support for trunk links between switches 1. VTP Mode The VTP configuration revision number in the transparent mode is always 0. 2. VTP operations The VTP protocol sends a VTP announcement on the trunk link through the multicast address 0100-0ccc-cccc; The

Before starting this article, we need to understand what is WCCP, simply put, WCCP (WEB Cache Communication Protocol) cisco is a protocol used to synchronize its edge routers with Content Engines (Cache servers. The Content Engine is responsible for collecting frequently accessed data, such as HTTP. When the master machine accesses the same data, it does not need

How to Set Up r12002 routing protocol for Cisco router 3620 to demonstrate how to set up r12002 routing protocol for Cisco router 3620 this time, we need to build a complex network experimental environment, this environment is also the experimental environment used later to learn about other router experiments. It is u

Tags: apply dynamic prepare Ane JKS class priority State oneOSPF Description:Multicast extension OSPF Lock Synonym OSPF generally refers to multicast extension OSPFThis entry is compiled and applied to the scientific entry of "Science China" encyclopedia. OSPF (Open Shortest Path first Open Shortest path priority) is an internal gateway protocol (Interior Gateway Protocol, or IGP) fo

Cisco router RIP version1 (2)* Note: This article is intended for the majority of users to learn. Some of them will mention some professional Internet terms or abbreviations. If you do not understand the network, you can learn and explore it together. If you have any questions, you can add QQ or YY. (QQ: 914560310, YY: 283755973) "//" is not a command output or description.This time we will talk about the RIP version1 passive interface and unicast upd

For network security, the accuracy of NTP is crucial. Setting it correctly takes only a small amount of time to protect its security without any extra investment, but the security improvements will be very large. This article describes in detail how to set the network time. Network Time Protocol (NTP) is a dedicated protocol based on User Datagram Protocol (UDP)

time before becoming active router.Router (config-if) Standby 1 preempt delay 10You canalso change Hello and holder time with the below command.Router (config-if) Standby 1 Timers 4 12By default HSRP Hello packets is sent to the multicast address 224.0.0.2 over UDP Port 1985There can be multiple HSRP virtual IP addresses.Router (config-if) standby 1 IP 192.168.1.5Router (config-if) Standby 1 IP 192.168.1.6 SecondaryHSRP Group is also assigned a "virtual MAC address". For HSRP Group 1, the value

The switch will send an echo to its neighbor. If the neighbor does not receive a response within a certain period of time, it is deemed that the link with the neighbor has a problem. In normal mode, the link may be regarded as an uncertain state and will not be closed (note that normal mode can only detect misunderstandings of optical fibers, such as Tx and Rx insertion and inversion ). In the aggressive mode, the link is regarded as one-way and closed (the interface is placed in the err-Disable