i**p 发帖数: 902 | 1 This is waht I read about L2TP
L2TP(Layer Two Tunneling Protocol,第二层通道协议)是VPDN(虚拟专用拨号网络
)技术的一种,专门用来进行第二层数据的通道传送,即将第二层数据单元,如点到点
协议(PPP)数据单元,封装在IP或UDP载荷内,以顺利通过包交换网络(如Internet)
,抵达目的地。
Here is my understanding, assuming I have a IP packet.
(my IP packet) ->
(Layer 2 header with tunnel destination layer 2 address sucah as MAC + ((my
IP packet)) ->
(IP header with tunnel destination IP address + (Layer 2 header with tunnel
destination layer 2 address sucah as MAC + ((my IP packet)) ) ->
(Layer 2 header with layer 2 address of next hop + (IP header with tunnel
destination IP address + (Layer 2 header with tunnel destination layer 2
address sucah as MAC + ((my IP packet)) ) )
Am I right? |
s*******8 发帖数: 12734 | |
s*******8 发帖数: 12734 | 3 Here is something I want to share:
Protocol stack:
ip
ppp
L2TP
udp
IP
layer2
L2TP encapsulation:
IP header+udp header+L2TP header+PPP header+IP header+IP packet Datagram |
s*****g 发帖数: 26 | 4 vpdn uses l2tpv2, which only supports ppp as payload L2 |
v**n 发帖数: 951 | 5 你可以参考一下思科的l2tpv3的文档。里面有encapsulation的例子。
如有问题,请PM我。
((my
tunnel
【在 i**p 的大作中提到】 : This is waht I read about L2TP : L2TP(Layer Two Tunneling Protocol,第二层通道协议)是VPDN(虚拟专用拨号网络 : )技术的一种,专门用来进行第二层数据的通道传送,即将第二层数据单元,如点到点 : 协议(PPP)数据单元,封装在IP或UDP载荷内,以顺利通过包交换网络(如Internet) : ,抵达目的地。 : Here is my understanding, assuming I have a IP packet. : (my IP packet) -> : (Layer 2 header with tunnel destination layer 2 address sucah as MAC + ((my : IP packet)) -> : (IP header with tunnel destination IP address + (Layer 2 header with tunnel
|
s*****g 发帖数: 1055 | 6 After you understand L2TP encap, then try to figure out how the packets of
L2TP over IPsec with NAT traversal look like.
my
tunnel
【在 i**p 的大作中提到】 : This is waht I read about L2TP : L2TP(Layer Two Tunneling Protocol,第二层通道协议)是VPDN(虚拟专用拨号网络 : )技术的一种,专门用来进行第二层数据的通道传送,即将第二层数据单元,如点到点 : 协议(PPP)数据单元,封装在IP或UDP载荷内,以顺利通过包交换网络(如Internet) : ,抵达目的地。 : Here is my understanding, assuming I have a IP packet. : (my IP packet) -> : (Layer 2 header with tunnel destination layer 2 address sucah as MAC + ((my : IP packet)) -> : (IP header with tunnel destination IP address + (Layer 2 header with tunnel
|
s*****g 发帖数: 1055 | 7 After you understand L2TP encap, then try to figure out how the packets of
L2TP over IPsec with NAT traversal look like.
my
tunnel
【在 i**p 的大作中提到】 : This is waht I read about L2TP : L2TP(Layer Two Tunneling Protocol,第二层通道协议)是VPDN(虚拟专用拨号网络 : )技术的一种,专门用来进行第二层数据的通道传送,即将第二层数据单元,如点到点 : 协议(PPP)数据单元,封装在IP或UDP载荷内,以顺利通过包交换网络(如Internet) : ,抵达目的地。 : Here is my understanding, assuming I have a IP packet. : (my IP packet) -> : (Layer 2 header with tunnel destination layer 2 address sucah as MAC + ((my : IP packet)) -> : (IP header with tunnel destination IP address + (Layer 2 header with tunnel
|
m********d 发帖数: 188 | 8
lt2pv3是很实用的技术,很多用处。可以代替mpls作为l2vpn的transport layer, 可以再
internet上做出一条高性能的tunnel(几个Gbps )。
【在 v**n 的大作中提到】 : 你可以参考一下思科的l2tpv3的文档。里面有encapsulation的例子。 : 如有问题,请PM我。 : : ((my : tunnel
|
z**r 发帖数: 17771 | 9 大规模应用的可能就sprint一家,这个东西是可以和mpls互补,不过如果有了mpls,也
的确没有必要上两套transport。不光l2vpn,l3vpn也可以
以再
【在 m********d 的大作中提到】 : : lt2pv3是很实用的技术,很多用处。可以代替mpls作为l2vpn的transport layer, 可以再 : internet上做出一条高性能的tunnel(几个Gbps )。
|
s*****g 发帖数: 1055 | 10 L2TP PW based VPN is not only used by SPs, enterprises use L2TP to establish
L2VPN too, one application of this configuration is vMotion which requires
two hosts are in the same VLAN.
【在 z**r 的大作中提到】 : 大规模应用的可能就sprint一家,这个东西是可以和mpls互补,不过如果有了mpls,也 : 的确没有必要上两套transport。不光l2vpn,l3vpn也可以 : : 以再
|
z**r 发帖数: 17771 | 11 what is vMotion?
establish
requires
【在 s*****g 的大作中提到】 : L2TP PW based VPN is not only used by SPs, enterprises use L2TP to establish : L2VPN too, one application of this configuration is vMotion which requires : two hosts are in the same VLAN.
|
c*****i 发帖数: 631 | 12 美国还有一家很大的用GRE做vpn......
这个世界干啥的都有。
【在 z**r 的大作中提到】 : 大规模应用的可能就sprint一家,这个东西是可以和mpls互补,不过如果有了mpls,也 : 的确没有必要上两套transport。不光l2vpn,l3vpn也可以 : : 以再
|
s**u 发帖数: 17 | 13 vMotion是虚拟化里的概念,如虚机飘移等。 |
s*****g 发帖数: 1055 | 14 A feature in vmware that two "live" VMs in the same VLAN have exact mirror
of each other, so you can take down one live server for maintenance and
the other VM will take over seamlessly. This is very useful when you need to
take one ESX host in a cluster for off-line services.
【在 z**r 的大作中提到】 : what is vMotion? : : establish : requires
|