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Middlebox is a technically imprecise term that is not in common usage among technical people anywhere. Why people in this thread are trotting it out is anyone's

• detaro 9y ago
  That's just plain wrong, in the context of protocol development it is a commonly used term, and not exactly uncommon in wider networking space as well. See MPTCP mentions in this thread, presentations and mailing lists around development of TLS, HTTP2, QUIC, ...
• deleted 9y ago
  [deleted]
• dfox 9y ago
  Middlebox has quite precise technical meaning: anything that works at higher layer than on which it is visible to neighboring network. Usualy this refers to various "security" "solutions" which attempt to do deep packet inspection and generally break various things, but it also can mean NAT or L2 bridges that do filtering on L3/L4 headers (for example DOCSIS CMs and CMTSes are such middleboxes)
• justonepost 9y ago
  What do they use?