请教一个关于网速的问题

[punkren]

读书少，头一次听说看YouTube和上传有关系

 

[uglyducking]

读书少，头一次听说看YouTube和上传有关系

关系是有的，什么时候有，关系多大，另说。

 

[mianfei]

能否请进一步解释一下。

Rogers 向某著名网络设备供应商定制了一个Feature美其名曰Packet Shaping，在西部时间白天将P2P速度降到30KBps，相当于拨号上网的速度。要被他盯上，会降到0 Bps。
http://communityforums.rogers.com/t5/forums/forumtopicpage/board-id/Getting_connected/thread-id/893
Oh yeah they are throttling p2p, an everything else they chose to. I have Ultimate, an when i download from a hotfile fileserver or from a filesonic i can maybe get 1.2-5 meg/sec at any random time, but then i go back on about 1/2 hour later an i can't d/l any faster then 200/k a second.. Rogers is controlling it the way they want.. I am actually trying to get some of my money backf or the last 3 months... this is just obsurd why they keep throttling.. i remember when they first got cable an that was amazing, an now they are the turtle again.... upgrade their systems... got korea is using gig lines now come on an their like 27/bucks a month equiviliant....


http://www.michaelgeist.ca/2007/04/rogers-packet-shaping/
it has been open secret that Rogers engages in packet shaping, conduct that limits the amount of available bandwidth for certain services such as peer-to-peer file sharing applications. Rogers denied the practice at first, but effectively acknowledged it in late 2005.

http://www.dslreports.com/faq/rogers/2_Rogers_Policies
Rogers does throttle P2P transfers using the BitTorrent protocols through the use of Cisco pCube Service Engines. It does this by dropping occasional packets. This causes the TCP/IP stacks of the sender and receiver to significantly slow down transfers.

而且Rogers不定期扫描你的端口，发现有FTP服务也会发警告信。

 

[mianfei]

延伸阅读：
http://www.cisco.com/c/en/us/suppor...ed-services-routers/110388-ios-block-p2p.html
Security Device Manager: Block P2P Traffic on a Cisco IOS Router using NBAR Configuration Example

https://supportforums.cisco.com/discussion/11649566/block-p2p-traffic
Block P2P traffic

https://supportforums.cisco.com/discussion/11478306/using-nbar-filter-peer-peer-p2p-traffic
Using NBAR to filter Peer-to-Peer P2P Traffic

http://www.dslreports.com/faq/11158
Unlike the previous sample configuration where P2P traffic is dropped or blocked, this sample configuration objective is to permit with restriction. The restriction is that all P2P traffic will be limited to only 8 kbps bandwidth. Any attempt from P2P traffic to use more than 8 kbps bandwidth will be dropped or blocked.

 

[map]

bell fiber系列上行一般有10M或者20M，用的还是比较爽的
下行30兆，上行如果只有1兆，照样卡的要死，打个skype网络电话都要卡的那种

 

[mianfei]

网络电话只需要16Kbps,最多64Kbps上下行带宽，而且基本是半双工，1M上行已经远远足够了。卡的话是因为Delay与Jitter而不是Bandwidth，有质的区别。

 

[mianfei]

Windows 平台很不适合VOIP，缺少QoS，只有带宽预留是不行的。
家里的路由器也要支持Qos，如D-link的WMM要打开，支持DSCP（Differentiated Services Code Points）最好，VoIP适配器和支持VoIP的路由器，语音数据包会被标识，然后核心网才可能优先调度，减少时延与抖动，可以明显提高通话质量。