# [OmniOS-discuss] strangeness ssh into omnios from oi_151a9

Richard PALO richard at netbsd.org
Thu Oct 1 11:49:03 UTC 2015

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    Le 01/10/15 11:58, Lauri Tirkkonen a écrit :
    > On Thu, Oct 01 2015 11:50:03 +0200, Richard PALO wrote:
    >>>> In that case, wouldn't setting tcp_tstamp_always on OI to '1' be better in
    >>>> this case (or would OI not honour that setting correctly)?
    >>>
    >>> It wouldn't work. From what I can tell, those ndd settings only affect
    >>> the SYN segments (ie.  timestamp negotiation); pre-5850 illumos will
    >>> always stop timestamping mid-connection if it receives a non-timestamped
    >>> segment.
    >>>
    >>
    >> Okay, I set tcp_tstamp_if_wscale to 0 and it does seem to work fine.
    >
    > Thanks, that pretty much confirms the issue is what I suspected it is.
    >
    >> (Hoping there isn't any fallout from doing this now...)
    >
    > As long as that middlebox has been mucking with your traffic in the way
    > it is, timestamps have been getting turned off mid-connection for your
    > pre-5850 box. I recommend you to ugprade to post-5850 if you can, or to
    > scream loudly at whoever is modifying your traffic :)
    >

    Actually I still notice some problems.. This morning in the direction OI => omnios
    things seemed okay.
    Now, omnios => OI I just now experienced the hang again, and it is repeatable.

    Could it be that your workaround is only useful for outbound connections (relative to OI)?

    --
    Richard PALO

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