公开(公告)号：EP1014651A3

公开(公告)日：2002-08-14

申请号：EP99308693.3

申请日：1999-11-02

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Cohen, Ariel ,  Rangarajan, Sampath

IPC: H04L29/06 ,  H04L12/56

CPC classification number: H04L47/10 ,  H04L47/2483

Abstract: A programmable network element (400) operates on packet traffic flowing through the element in accordance with a gateway program (404, 405, 406) which is dynamically uploaded into the network element or unloaded from it via a mechanism separate from the actual packet traffic as the element operates. Such programmable network element can simultaneously operate on plural packet flows with different or the same programs being applied to each flow. A dispatcher (402) provides a packet filter (403) with a set of rules provided by one or more of the dynamically loaded and invoked programs. These rules define, for each program, the characteristics of those packets flowing through the network element that are to be operated upon in some manner. A packet that flows from the network through the filter and satisfies one or more of such rules is sent by the packet filter to the dispatcher. The dispatcher, in accordance with one of the programs, either sends the packet to the program for manipulation by the program itself, or manipulates the packet itself in a manner instructed by the program. The processed packet is sent back through the filter to the network for routing to its destination.

公开(公告)号：EP1011244A3

公开(公告)日：2002-06-05

申请号：EP99309826.8

申请日：1999-12-07

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Cohen, Ariel ,  Rangarajan, Sampath ,  Singh, Navjot

IPC: H04L29/06 ,  G06F17/30 ,  H04L29/12

CPC classification number: H04L67/2804 ,  H04L29/06 ,  H04L29/12009 ,  H04L61/00 ,  H04L67/1002 ,  H04L67/1017 ,  H04L67/1019 ,  H04L67/1027 ,  H04L67/2814 ,  H04L69/16 ,  H04L69/161 ,  H04L69/165 ,  H04L69/166

Abstract: In order to transparently redirect an HTTP connection request that is directed to an origin server (107) to a proxy cache (110-1), a proxy redirector (104) translates the destination address of packets directed to the origin server to the address of the proxy. During a handshaking procedure, a TCP connection is transparently established between the client (110-1) and the proxy cache. When the client transmits a GET request to what it thinks is the origin server, which request specifies the complete address of an object at that origin server that it wants a copy of, the proxy redirector modifies the complete address specified in that GET request before it is sent to the proxy cache. Specifically, the IP address of the origin server found in the destination field in the IP header of the one or more packets from the client containing the GET request is added by the proxy redirector as a prefix to the complete URL in the GET request to form an absolute URL. The proxy cache determines from that absolute URL whether it has the requested object stored in its cache. If it does, it sends the object back to the proxy redirector, which masquerades those packets as coming from the origin server by translating their destination address to the address of the client and their source address to that of the origin server. If the proxy does not have the requested object, a separate TCP connection is established between the proxy and the origin server from where the object is retrieved and then forwarded over the TCP connection between the client and the proxy. In order to account for the additional number of bytes in the GET request, an acknowledgement sequence number in packets returned from the proxy that logically follow receipt of the GET request are decremented by that number by the proxy redirector before being forwarded to the client. Similarly, a sequence number in packets transmitted by the client subsequent to the GET request are incremented by that number before being forwarded by the proxy redirector to the proxy cache.

公开(公告)号：EP1014651A2

公开(公告)日：2000-06-28

申请号：EP99308693.3

申请日：1999-11-02

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Cohen, Ariel ,  Rangarajan, Sampath

IPC: H04L29/06 ,  H04L12/56

CPC classification number: H04L47/10 ,  H04L47/2483

Abstract: A programmable network element (400) operates on packet traffic flowing through the element in accordance with a gateway program (404, 405, 406) which is dynamically uploaded into the network element or unloaded from it via a mechanism separate from the actual packet traffic as the element operates. Such programmable network element can simultaneously operate on plural packet flows with different or the same programs being applied to each flow. A dispatcher (402) provides a packet filter (403) with a set of rules provided by one or more of the dynamically loaded and invoked programs. These rules define, for each program, the characteristics of those packets flowing through the network element that are to be operated upon in some manner. A packet that flows from the network through the filter and satisfies one or more of such rules is sent by the packet filter to the dispatcher. The dispatcher, in accordance with one of the programs, either sends the packet to the program for manipulation by the program itself, or manipulates the packet itself in a manner instructed by the program. The processed packet is sent back through the filter to the network for routing to its destination.

Abstract translation: 可编程网络元件（400）根据网关程序（404,405,406）对流经该元件的分组流量进行操作，网关程序（404,405,406）通过与实际分组流量分开的机制动态上载到网元或从其卸载 该元素运行。 这样的可编程网元可以同时对具有不同或相同的程序应用于每个流的多个分组流进行操作。 调度器（402）向包过滤器（403）提供由一个或多个动态加载和调用的程序提供的一组规则。 这些规则为每个程序定义了以某种方式流经网元的那些数据包的特性。 从网络流过滤波器并满足一个或多个这样的规则的分组由分组过滤器发送到分派器。 调度员根据其中一个程序，将程序包发送给程序进行程序自身的操作，或以程序指示的方式操纵数据包本身。 经处理的数据包通过过滤器发回到网络进行路由到其目的地。

公开(公告)号：EP1011244A2

公开(公告)日：2000-06-21

申请号：EP99309826.8

申请日：1999-12-07

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Cohen, Ariel ,  Rangarajan, Sampath ,  Singh, Navjot

IPC: H04L29/06 ,  G06F17/30

CPC classification number: H04L67/2804 ,  H04L29/06 ,  H04L29/12009 ,  H04L61/00 ,  H04L67/1002 ,  H04L67/1017 ,  H04L67/1019 ,  H04L67/1027 ,  H04L67/2814 ,  H04L69/16 ,  H04L69/161 ,  H04L69/165 ,  H04L69/166

Abstract: In order to transparently redirect an HTTP connection request that is directed to an origin server (107) to a proxy cache (110-1), a proxy redirector (104) translates the destination address of packets directed to the origin server to the address of the proxy. During a handshaking procedure, a TCP connection is transparently established between the client (110-1) and the proxy cache. When the client transmits a GET request to what it thinks is the origin server, which request specifies the complete address of an object at that origin server that it wants a copy of, the proxy redirector modifies the complete address specified in that GET request before it is sent to the proxy cache. Specifically, the IP address of the origin server found in the destination field in the IP header of the one or more packets from the client containing the GET request is added by the proxy redirector as a prefix to the complete URL in the GET request to form an absolute URL. The proxy cache determines from that absolute URL whether it has the requested object stored in its cache. If it does, it sends the object back to the proxy redirector, which masquerades those packets as coming from the origin server by translating their destination address to the address of the client and their source address to that of the origin server. If the proxy does not have the requested object, a separate TCP connection is established between the proxy and the origin server from where the object is retrieved and then forwarded over the TCP connection between the client and the proxy. In order to account for the additional number of bytes in the GET request, an acknowledgement sequence number in packets returned from the proxy that logically follow receipt of the GET request are decremented by that number by the proxy redirector before being forwarded to the client. Similarly, a sequence number in packets transmitted by the client subsequent to the GET request are incremented by that number before being forwarded by the proxy redirector to the proxy cache.

Abstract translation: 为了透明地重定向HTTP连接请求的没有被引导到在源服务器（107）到代理高速缓存（110-1），代理重定向器（104）反式酸酯定向到原始服务器的分组的目的地地址的地址 代理。 在握手过程中，TCP连接被透明客户端（110-1）和所述代理缓存之间建立。 当客户端发送一个GET请求，它认为什么是原始服务器，其中请求规定对象的完整地址没有原始服务器做了它之前，它希望的副本，代理重定向修改中指定的完整地址没有得到请求 被发送到代理缓存。 具体地，在目的地字段中发现在从客户端包含GET请求的一个或多个分组的IP报头中的源服务器的IP地址是由代理重定向作为前缀添加到在GET请求中的完整的URL，以形成 绝对URL。 从代理缓存确定性的地雷没有绝对的URL是否已经被请求的对象存储在它的高速缓存。 如果是这样，它发送的对象返回给代理重定向器，它通过翻译他们的目的地地址给客户端的地址和源地址和源服务器所做的伪装那些包从源服务器的到来。 如果代理没有请求的对象，一个单独的TCP连接代理，并从该对象检索，然后转发在客户端与代理之间的TCP连接的源服务器之间建立的。 为了在从所述代理返回并在逻辑上遵循收据GET请求的数据包，以考虑字节在GET请求中的附加数量，在确认序号由数字被转发给客户机之前递减并通过所述代理重定向器。 类似地，在由客户端继GET请求发送的分组的序列号被数字确实由代理重定向器转发到代理缓存之前递增。

公开(公告)号：EP1011244B1

公开(公告)日：2004-09-08

申请号：EP99309826.8

申请日：1999-12-07

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Cohen, Ariel ,  Rangarajan, Sampath ,  Singh, Navjot

IPC: H04L29/06 ,  G06F17/30 ,  H04L29/12

CPC classification number: H04L67/2804 ,  H04L29/06 ,  H04L29/12009 ,  H04L61/00 ,  H04L67/1002 ,  H04L67/1017 ,  H04L67/1019 ,  H04L67/1027 ,  H04L67/2814 ,  H04L69/16 ,  H04L69/161 ,  H04L69/165 ,  H04L69/166