In many sections of the text we refer to documents known as Internet Drafts and RFCs. In general, if we refer to RFC 2545, then it can be found at http://www.ietf.org/rfc/rfc2545.txt. There's also an overall index of all RFC documents available at http://www.ietf.org/rfc/rfc-index.txt. You can use this to check if an RFC has been updated by a more recent document.
Internet Drafts are living documents and may or may not become RFCs at the end of their lives as drafts. A draft will usually have a name like http://www.ietf.org/internet-drafts/draft-ietf-ipv6-flow-label-07.txt. The digits "07" at the end the end of the draft name is the current version of the draft, and this could be incremented at any time. If we refer you to a draft which is no longer available at the location we specify, try increasing the version number to find the current version of the draft. Sometimes, if a draft is abandoned entirely, it may become unavailable on the IETF site. If you are still interested in such a draft then your best hope is to pop its name into your favorite search engine.
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