本文選題：實際網(wǎng)絡 + 對稱型NAT�。� 參考：《哈爾濱工業(yè)大學》2014年碩士論文

【摘要】：隨著多媒體通信技術和互聯(lián)網(wǎng)技術的不斷發(fā)展,點對點之間的通信要求變得越來越高。如何使兩個客戶端在不同的網(wǎng)絡間實現(xiàn)穩(wěn)定,快速連接傳輸?shù)腜2P(peer-to-peer)通信成為熱門研究課題。特別在復雜網(wǎng)絡環(huán)境下,這種研究和相關技術實現(xiàn)更顯得非常重要。NAT(Network Address Translator,網(wǎng)絡地址轉(zhuǎn)換)的存在解決了IP地址短缺的問題。SIP協(xié)議(Session Initiation Protocol,會話發(fā)起協(xié)議)的提出提供了兩客戶端之間會話連接建立的技術標準,但是,NAT的存在使得私有網(wǎng)絡的SIP信息數(shù)據(jù)包無法在公有網(wǎng)絡上路由。為了實現(xiàn)在實際網(wǎng)絡結構中可靠的網(wǎng)絡穿越連接,保證SIP信息數(shù)據(jù)包在不同局域網(wǎng)間傳輸,一方面,本文使用TCP連接代替UDP連接進行NAT穿越,模擬TCP三次握手完成NAT連接,避免在網(wǎng)絡不穩(wěn)定或者帶寬受限等情況下,因為UDP丟包不可靠連接的性質(zhì)而引起NAT穿越不成功。另一方面,鑒于實際網(wǎng)絡環(huán)境中比較常見的對稱型NAT網(wǎng)絡設備很難穿越成功,本文在原有ICE(Interactive Connectivity Establishment,交互連通建立)框架理論基礎上,重點提出了一種改進ICE候選地址機制的網(wǎng)絡穿越方案,給出了對稱NAT類型的端口映射方式的分類以及相對應的端口預測功能,從而解決了對稱NAT類型網(wǎng)關的網(wǎng)絡穿越問題。盡量避免中繼傳輸所引起的網(wǎng)絡負載壓力增大問題,有利于提高連接服務質(zhì)量�；谏厦嫣岢龅膬煞矫�,本論文的程序基于PJSIP協(xié)議庫實現(xiàn),在PJSIP協(xié)議棧中添加了端口預測功能化模塊,并在實際網(wǎng)絡環(huán)境中進行了測試,數(shù)據(jù)結果顯示所添加的模塊符合預期效果,端口命中率符合理論值。
[Abstract]:With the development of multimedia communication technology and Internet technology, the requirement of point-to-point communication becomes higher and higher. How to make the two clients stable between different networks and how to quickly connect P2Ppeer-to-peer communication has become a hot research topic. Especially in the complex network environment, This kind of research and related technical implementation become more important. The existence of NATN Network Address translator (network address translation) solves the problem of IP address shortage. Sip protocol session Initiation protocol (session initiation protocol) provides a session connection between two clients. The established technical standards, However, due to the existence of Nat, private SIP packets cannot be routed over public networks. In order to realize reliable network traversing connection in actual network structure and ensure the transmission of SIP information packet between different LAN, on the one hand, this paper uses TCP connection instead of UDP connection to traverse NAT, and simulates TCP three times handshake to complete NAT connection. In the case of network instability or bandwidth constraints, NAT traversal is not successful because of the unreliable connection properties of UDP packet loss. On the other hand, in view of the fact that symmetric NAT network devices are difficult to traverse successfully in the real network environment, this paper bases on the original ICE(Interactive Connectivity establishment (interactive connectivity) framework theory. In this paper, a network traversal scheme with improved ICE candidate address mechanism is proposed, and the classification of symmetric NAT type port mapping mode and the corresponding port prediction function are given, thus solving the network traversal problem of symmetric NAT type gateway. The problem of network load pressure caused by relay transmission is avoided and the quality of service is improved. Based on the above two aspects, the program of this paper is implemented on the basis of PJSIP protocol library, and the port prediction function module is added to the PJSIP protocol stack, and tested in the actual network environment. The data results show that the added module conforms to the expected effect and the port hit rate accords with the theoretical value.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TP393.04

【參考文獻】

相關期刊論文 前3條

1 蔡聞怡;陳一民;;基于代理的SIP穿越NAT和防火墻方案[J];計算機工程;2007年22期

2 劉春燕;陳名松;冼莉莉;;基于端口探測的SIP穿透NAT的設計與實現(xiàn)[J];計算機工程;2008年17期

3 石碩;林莉;李久仲;張蒲生;;基于端口準隨機猜測的UDP穿越Symmetric NAT的方法[J];計算機工程與設計;2008年01期

相關碩士學位論文 前1條

1 閔江;一種利用TURN穿越對稱型NAT方案的設計與實現(xiàn)[D];華中科技大學;2008年

，

本文編號：1828185