IP Options are not an option
IP Options are not an option
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发表时间：
2005
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影响因子：
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通讯作者：
Rodrigo Fonseca;G. Porter;R. Katz;S. Shenker;I. Stoica
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作者：
Rodrigo Fonseca;G. Porter;R. Katz;S. Shenker;I. Stoica
在过去的几年里，已经提出了对因特网体系结构的各种增强，其中许多需要在通过网络fl时将元数据或状态附加到包。这种扩展的例子有IP回溯[10]和XCP[6]。IP specifica-tionsupportsan“options”mechanismasanextensiblewayto将状态与数据包耦合。然而，正如我们将在本文中所展示的那样，IP选项在Internet中并没有得到很好的支持。我们利用PlanetLab行星规模网络试验床[2]来量化支持IP选项的包在广域范围内的命运。我们使用标准IP包和带选项的包来测量广域路径。我们发现，大约一半的互联网路径丢弃了带有选项的数据包，这带来了严重的可靠性问题。令人惊讶的是，我们的fi结果表明，恢复对广域期权的支持是可行的。我们发现，网络的核心丢弃的OPTIONS包非常少，而边缘AS网络中的OPTIONS丢包最多，而且这些丢包集中在少数AS中。
A wide variety of enhancements to the Internet architec-ture have been proposed over the past several years, manyof which require attaching metadata, or state, to packetsas they flow through the network. Examples of such exten-sions are IP traceback[10] and XCP[6]. The IP specifica-tionsupportsan“options”mechanismasanextensiblewayto couple state with packets. However, as we will show inthis paper, IP options are not well supported in the Inter-net. We make use of the PlanetLab planetary scale networktestbed[2] to quantify the fate of IP-option enabled packetsin the wide-area. We measured wide-area paths with bothstandard IP packets and packets with options. We discov-ered that approximately half of Internet paths drop packetswith options, raising serious dependability issues. Surpris-ingly, our findings indicate that it is feasible to restore sup-port for options in the wide-area. We discovered that thecore of the network drops very few options packets, with thevastmajorityofthose dropsoccurringin edgeAS networks.Furthermore, these drops are concentrated in a minority ofthe ASes.