Thanks for ur mail. I have just copied some lines written below along with
URL address betwwen the dotted lines.
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http://www.netbsd.org/Changes/changes-1.4.html#net
Significant changes from NetBSD 1.3 to 1.4
add new TCP input reassembly code as a stepping stone to implementing SACK
(RFC2018). [matt 19980429]

Apply/merge/adapt the NEWRENO parts of the UCSB SACK/FACK/NEWRENO diffs of
BSDI's 3.0 netinet to NetBSD. [unknown 19981005]
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Since it is written here that significant changes from NetBSD 1.3 to 1.4 has
been made. So my question is regarding these changes, wether these are
available now or still not ?

I'm not sure what SACK is, but a ``1.4 R'' version would be late in NetBSD
-current, for 1.4, I think.
Yes, u right , my installed version is 1.4 current.

``-current'' versions of NetBSD are NOT releases.  Features in 1.4's
-current, in general, will wait until AT LEAST the 1.5 release before they
are made available as part of a release.  (Versions 1.4.1, 1.4.2, and
(soon?) 1.4.3 are basically bug-fixes to version 1.4.  Features are
generally added to NetBSD only during full releases, such as 1.3, 1.4, and
(soon?) 1.5.)

You might find SACK in the 1.5_ALPHA release, as well.  The ``ALPHA''
denotes that it is still in testing; it is a pre-release version of 1.5.
(I'm not sure if NetBSD -current is presently the same as the most recent
1.5_ALPHA.  I don't follow -current, so I don't know exactly where it is,
right now.)

I will try to do that also.

Installing 1.5_ALPHA from scratch is very similar to installing a regular
release from scratch.  I'm less sure about installing NetBSD -current.


Bear in mind that, by definition, -current and ALPHA versions are not as
tested.  Although 1.5_ALPHA seems to work quite well for me, I only
installed it because 1.4.x releases did not support my ethernet cards.


  "I probably don't know what I'm talking about." --rauch@eecs.ukans.edu