The IESG has received a request from the Multipath TCP WG (mptcp) to consider the following document: - 'MPTCP Application Interface Considerations' <draft-ietf-mptcp-api-05.txt> as Informational RFC The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the ietf@ietf.org mailing lists by 2012-08-14. Exceptionally, comments may be sent to iesg@ietf.org instead. In either case, please retain the beginning of the Subject line to allow automated sorting. Abstract Multipath TCP (MPTCP) adds the capability of using multiple paths to a regular TCP session. Even though it is designed to be totally backward compatible to applications, the data transport differs compared to regular TCP, and there are several additional degrees of freedom that applications may wish to exploit. This document summarizes the impact that MPTCP may have on applications, such as changes in performance. Furthermore, it discusses compatibility issues of MPTCP in combination with non-MPTCP-aware applications. Finally, the document describes a basic application interface which is a simple extension of TCP's interface for MPTCP-aware applications. The file can be obtained via http://datatracker.ietf.org/doc/draft-ietf-mptcp-api/ IESG discussion can be tracked via http://datatracker.ietf.org/doc/draft-ietf-mptcp-api/ballot/ No IPR declarations have been submitted directly on this I-D.