Re: 求助! 關_語音聊天 behind NAT
我不知你用甚麼辦法找出proprietary socket 的 standard (most of
them won't show you how the socket is bind or anything ) 但
你可nmap找出port number. Kernel module 的基本不太困難, 亦不簡單,
主要是module上有什麼功能, 如你能reverse engineer他們的socket call
應該可以找到答案. 這是一些link由google.com找到的希望有幫助, 我很久
沒有Develope與Kernel有關的工作, 亦不太清楚masq module的方向, 你可
email下例的Developer及debian-devel@lists.debian.org 他們對Kernel
會有比較深入的認識.
http://user.rli.net/kevin/masq.html
http://dplay-masq.sourceforge.net/faq.html
http://www.thelinuxreview.com/howto/IP-MASQ/x2135.htm
http://netmeetingmasq.sourceforge.net/
Good luck
Alex
Zou Min wrote:
Thanks for you immediate reply.
If I wanna write my own ip_masq module(in 2.2.x) for an voice chat
application, which is however an proprietary software, where should I
start from? or any references/links to read?
Furthermore, how to I discover the port numbers the application is using?
Alex Lau wrote:
>Special socket program like anything started with "Microsoft" may need a
>module e.g H323
>for the kernel in order to to work. I'm not sure why H.323 module didn't
>work (need debug)
>but 2.4 iptable look a lot cleaner and less security issue (2.2-20 is
>the current
>stable kernel for ip masq ) I don't use microsoft product dont' know
>what to suggest you
>to use. But port forwarding should be the same as your masquerading
>script instead of
>just putting ip you put ip:port number
>
>http://www.tldp.org/HOWTO/IP-Masquerade-HOWTO/kernel-2.2.x-requirements.html
>Good Luck
>Alex
>
>
>Zou Min wrote:
>
>
>
>>HI,
>>
>>我們用的是一個內部網絡通過IP Masquerade共享一個IP上網的.
>>
>>目前主要問題是不能在內部網絡裡使用語音聊天軟件與外部網絡的機器聊天.
>>我試過
>>MSN Messenger 4.6, p2p voice chat.
>>Microsoft Netmeeting 3.01
>>V2 Communicator (from www.v2tech.com)
>>都有問題. 前兩個都是不能聯機, 而V2 Communicator可以互相聯上, 但是只能說話
>>給對方, 但是聽不見對方的語音.
>>
>>至于Netmeeting, 我試過這個意大利人寫的 H.323 module.
>>(http://www.coritel.it/coritel/ip/sofia/nat/nat2/nat2.htm)
>>但是好像還是不行.
>>
>>我們的IP Masq Server用的是Linux kernel-2.2.19, with ipchains-1.3.10-15.
>>("rc.firewall"基本上是照搬Linux IP Masquerade HOWTO上的)
>>
>>如果你們有任何一個聊天軟件的成功經驗的話, 不妨交流一下.
>>
>>如果我要自己設定port forwarding rules的話, 應該怎樣設? 對于任何一個聊天軟件,
>>比如, V2 Communicator, 我應該怎樣去找哪些port我需要forward?
>>
>>也許, post在這裡有點off-topic, 但是我找了很多地方, 都沒有好的解決辦法.
>>多謝哪位網絡高手相助!
>>
>>
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>>
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