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私有VLAN（英文：Private VLAN），也称为专用VLAN，是一種電腦網路技術，它包含被限制的交换机端口，使得它们只能与给定的“上行链路”（uplink）通信。受限（restricted）端口称为“私有端口”。每个专用VLAN通常包含许多私有端口和单个上行链路。上行链路通常是连接到路由器、防火墙、服务器、提供商网络或类似中心资源的端口。
, Private VLAN, also known as port isolation … Private VLAN, also known as port isolation, is a technique in computer networking where a VLAN contains switch ports that are restricted such that they can only communicate with a given uplink. The restricted ports are called private ports. Each private VLAN typically contains many private ports, and a single uplink. The uplink will typically be a port (or link aggregation group) connected to a router, firewall, server, provider network, or similar central resource. The concept was primarily introduced as a result of the limitation on the number of VLANs in network switches, a limit quickly exhausted in highly scaled scenarios. Hence, there was a requirement to create multiple network segregations with a minimum number of VLANs. The switch forwards all frames received from a private port to the uplink port, regardless of VLAN ID or destination MAC address. Frames received from an uplink port are forwarded in the normal way (i.e. to the port hosting the destination MAC address, or to all ports of the VLAN for broadcast frames or for unknown destination MAC addresses). As a result, direct peer-to-peer traffic between peers through the switch is blocked, and any such communication must go through the uplink. While private VLANs provide isolation between peers at the data link layer, communication at higher layers may still be possible depending on further network configuration. A typical application for a private VLAN is a hotel or Ethernet to the home network where each room or apartment has a port for Internet access. Similar port isolation is used in Ethernet-based ADSL DSLAMs. Allowing direct data link layer communication between customer nodes would expose the local network to various security attacks, such as ARP spoofing, as well as increase the potential for damage due to misconfiguration. Another application of private VLANs is to simplify IP address assignment. Ports can be isolated from each other at the data link layer (for security, performance, or other reasons), while belonging to the same IP subnet. In such a case, direct communication between the IP hosts on the protected ports is only possible through the uplink connection by using MAC-Forced Forwarding or a similar Proxy ARP based solution.ing or a similar Proxy ARP based solution.
, Un VLAN privé (private VLAN) est une confi … Un VLAN privé (private VLAN) est une configuration de réseau informatique où certains ports des commutateurs sur lesquels sont définis des VLAN sont restreints. En général, on ne leur permet de communiquer qu'avec un certain « lien ascendant » (uplink). Par conséquent, tous les ordinateurs membres d'un VLAN ne peuvent pas forcément communiquer entre eux.uvent pas forcément communiquer entre eux.
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Un VLAN privé (private VLAN) est une confi … Un VLAN privé (private VLAN) est une configuration de réseau informatique où certains ports des commutateurs sur lesquels sont définis des VLAN sont restreints. En général, on ne leur permet de communiquer qu'avec un certain « lien ascendant » (uplink). Par conséquent, tous les ordinateurs membres d'un VLAN ne peuvent pas forcément communiquer entre eux.uvent pas forcément communiquer entre eux.
, 私有VLAN（英文：Private VLAN），也称为专用VLAN，是一種電腦網路技術，它包含被限制的交换机端口，使得它们只能与给定的“上行链路”（uplink）通信。受限（restricted）端口称为“私有端口”。每个专用VLAN通常包含许多私有端口和单个上行链路。上行链路通常是连接到路由器、防火墙、服务器、提供商网络或类似中心资源的端口。
, Private VLAN, also known as port isolation … Private VLAN, also known as port isolation, is a technique in computer networking where a VLAN contains switch ports that are restricted such that they can only communicate with a given uplink. The restricted ports are called private ports. Each private VLAN typically contains many private ports, and a single uplink. The uplink will typically be a port (or link aggregation group) connected to a router, firewall, server, provider network, or similar central resource.ider network, or similar central resource.
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私有VLAN
, Private VLAN
, VLAN privé
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