middlebox

基本解釋

The anonymity and inaccessibility of the internal hosts behind a middlebox is not a problem for client software such as web browsers, which only need to initiate outgoing connections.
這樣的話，這些匿名的并且看起來難以觸及的藏在NAT之后的內網(wǎng)主機對于像Web瀏覽器這種軟件來說就不是一個問題,因為內網(wǎng)的主機只需要發(fā)起向外部的連接就可以了。
In this section we first summarize some middlebox terms. We focus hereon the two kinds of middleboxes that commonly cause problems for P2P applications.
在這一章節(jié)中，首先概要的介紹一下““代理””技術的一些術語。然后集中討論兩種造成P2P應用問題的代理機制。