nat

I want to connect to computers, each one of them behind a NAT router. I read that STUN only works with one computer behind a NAT router. Is that true? If so, how can I solve that double-NAT problem? Thanks, Thomas UDP hole punching and TCP hole punching TURN is a set of extensions to STUN that help to solve the double-NAT problem. You still need a server in the cloud, and the clients need to register. Source for some free servers is available . From the TURN internet draft: As described in [RFC5128] and [RFC4787], hole punching techniques will fail if both hosts are behind NATs that are not

I'm trying to make an (apache) server behind multi-layered NAT to be accessible from Internet. Restrictions: Avoid relay. There is a public server (we call him the OldMan) for login / stun, but its bandwidth is too poor to carry relay data. I have no right to configure the NATs manually. 3.User don't have to change their browser or device.(that is, works on android, ios, and any PC) I tried UPnP , but it only works on 1-layered NAT . I tried to search NAT traversal solutions for several months, but in vain. I study STUN/TURN/ICE ,and tried pjsip (icedemo.exe + numb), however, its stun cannot

Are there any open source cross platform NAT punch throughs? I haven't seen one, but you'll find more information than you require here: http://www.enchantedage.com/node/8 It's not terribly hard to implement, just a bit of work. There is code on the page that demonstrates this that builds on unix and windows, including both the server portion (the introducer) and the client portions. It doesn't list a license, but the author indicates in the readme that the technique is free, and re-implementing it from the information on the page and the source code example appears to be relatively easy. The

上图为公司的网络拓扑图，图中的UTM产品为戴尔的SonicWALL TZ 215。公司希望外网能访问192.168.1.253这台机器的web， 通过NAT映射可满足， 具体的步骤如下： 创建地址对象(Address Object) ⑴、选择Network->Address Objects ⑵、点击Add按钮，为服务器添加一个局域网私有地址： Name: Webster Private Zone Assignment: LAN Type: Host IP Address: 192.168.1.151 ⑶、点击OK完成添加地址对象 创建服务(Service Object) ⑴、选择Network->Services ⑵、点击Add按钮，为服务器添加一个端口： Name: HTTP 8000 Protocol: TCP(6) Port Range: 8000 - 8000 Sub Type: None ⑶、点击Add按钮完成配置 注：系统内置了FTP、HTTP、HTTPS、SSH、Telnet等常用端口，无须创建。 创建NAT策略(NAT Policy) ⑴、选择Network->NAT Policies ⑵、点击Add按钮，进行相关配置： Original Source: Any Translated Source: Original Original Destination:

I am running FILE-Zilla ftp server on windows in one of the LAN pc connect to my router. i am trying to access the FTP server from the network outside of the router using Router WAN ip (WAN-to-LAN) by adding Port-Forwarding rule (NAT) in the router. I have 2 cases here as per below configurations. the 1st is working and the 2nd is not (in Passive mode). Note: i have added the custom inbound rule in the windows 7 firewall where the ftp server is running. Configuration #1 Filezilla FTP server port: 21 Passive port range: 50000-51000 NAT - external port: 21 NAT - internal port: 21 Windows

There is an answer explaining in simple terms how a router works translating requests from the local network to outside and back ( https://superuser.com/questions/105838/how-does-router-know-where-to-forward-packet ) what is not clear - for how long a record in the NAT is kept? For example, if I send a UDP request to 25.34.11.56:3874 and my local endpoint is 192.168.1.21:54389 the router rewrites the request packet and adds a record to the NAT. Let's say the external endpoint will be 68.55.32.89:34535. Then the computer which received my request responds to the 68.55.32.89:34535 and the packet