Spud -- Session Protocol Underneath Datagrams


About Spud
English (USA)

The deployment of new transport protocols as well as the
extension of existing IETF-defined transport protocols faces the continuing
challenge of how to make these protocols robust against packet and flow
modification in the Internet at the hands of middleboxes. The increasing
deployment of these packet modifications have made expectations about
packet handling behaviors implicit. For example, a TCP packet with the SYN
and ACK flags set not only synchronizes sequence numbers and set up state
on both endpoints for a TCP connection (its explicit meaning), it also
confirms network address translation (NAT) mappings along the path as well
as signifying to any firewalls along the path that the endpoint has
accepted the connection (implicit meanings). One strategy to resolve this
tussle, identified and discussed during the recent IAB workshop on Stack
Evolution in a Middlebox Internet (SEMI), would be to provide a mechanism
for applications at the end as well as boxes along the path to explicitly
declare their assumptions and intentions. This list is for discussion of
the definition of such a mechanism, as part of a pre-WG activity to
determine what can be done.

To see the collection of prior postings to the list, visit the Spud Archives.

Using Spud
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