https://bugzilla.mindrot.org/show_bug.cgi?id=3139
Bug ID: 3139
Summary: Tunneling does not work on recent versions of macOS
Product: Portable OpenSSH
Version: 7.9p1
Hardware: All
OS: Mac OS X
Status: NEW
Severity: normal
Priority: P5
Component: Miscellaneous
Assignee: [email protected]
Reporter: [email protected]
Support for it was already tenuous, as I am assuming it was using the
tuntaposx http://tuntaposx.sourceforge.net/ TUN/TAP driver which
appears to be defunct (it was hard to maintain and Apple is
"discouraging" development of KEXTs).
Darwin and thus macOS has had for a while "user tunnel" (utun)
pseudodevices, which could be a solution to this. Several VPN packages
use this on macOS to provide their functionality, but I have not found
much about it in relation to OpenSSH.
utun operates in user mode and presents a socket rather than a
character device. It is pretty well described in Chapter 17 of
http://newosxbook.com/MOXiI.pdf , especially from page 682 (PDF page
718)
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