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Re: RFC 1323 implementation

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  • Hsiao-keng Jerry Chu
    Vendor: Sun Microsystems, Inc. Product: Solaris Version: 2.6 Checklist items: 1-14 (except for a couple of minor known bugs described below) By default the
    Message 1 of 7 , May 1, 1998
      Vendor: Sun Microsystems, Inc.
      Product: Solaris
      Version: 2.6
      Checklist items: 1-14 (except for a couple of minor known bugs
      described below)

      By default the active open side will NOT initiate any window scale/
      timestamp options unless necessary (e.g. app specifying a >= 64k
      receive buffer size). The can be overridden by some system tunables.

      ------------------------------------------------
      _ Section 2.2
      1. |X| Window Scale Option
      2. |X| Only send in SYN/ACK if received in SYN
      3. |X| Window Scale size based on receive buffer size

      _ Section 2.3
      4. |X| Shift values > 14 are logged and treated as 14.

      => We treat values > 14 as 14 but don't log an error.

      _ Section 3.2
      5. |x| Timestamps Option
      6. |x| Only send in SYN/ACK if received in SYN
      7. |x| RTT calculations based on Timestamps

      _ Section 3.4
      *8. |x| Update TS.Recent if:
      SEG.TSval >= TSrecent and SEG.SEQ <= Last.ACK.sent

      _ Section 4.x
      9. |X| PAWS
      10. |X| "invalidate" TS.Recent if idle > 24 days.

      _ Appendix A:
      *11. |X| TCP Maxseg option: MSS = MTU - fixed IP/TCP header

      => We just discovered a bug, although minor, when some IP option is
      => enabled. The size of the IP option gets subtracted from MSS by mistake.
      => Since we implemented 12/13 correctly, this only unnecessarily reduces
      => the effective usable payload size. The bug will be fixed asap.

      *12. |X| On output: adjust TCP data length for TCP options
      *13. |X| adjust TCP data length for IP options

      _ Appendix C:
      *14. |X| Disable Karn algorithm w/RTTM

      * New/changed items from RFC 1323.
    • Jason Thorpe
      Regarding Dave s RFC1323 survey (Dave, this is an update/correction to the one which Kevin sent to you earlier...): _ Section 2.2 1. |_| Window Scale Option
      Message 2 of 7 , May 4, 1998
        Regarding Dave's RFC1323 survey (Dave, this is an update/correction to
        the one which Kevin sent to you earlier...):

        _ Section 2.2
        1. |_| Window Scale Option
        2. |_| Only send in SYN/ACK if received in SYN
        3. |_| Window Scale size based on receive buffer size

        _ Section 2.3
        4. |_| Shift values > 14 are logged and treated as 14.

        _ Section 3.2
        5. |_| Timestamps Option
        6. |_| Only send in SYN/ACK if received in SYN
        7. |_| RTT calculations based on Timestamps

        _ Section 3.4
        *8. |_| Update TS.Recent if:
        SEG.TSval >= TSrecent and SEG.SEQ <= Last.ACK.sent

        _ Section 4.x
        9. |_| PAWS
        10. |_| "invalidate" TS.Recent if idle > 24 days.

        _ Appendix A:
        *11. |_| TCP Maxseg option: MSS = MTU - fixed IP/TCP header
        *12. |_| On output: adjust TCP data length for TCP options
        *13. |_| adjust TCP data length for IP options

        _ Appendix C:
        *14. |_| Disable Karn algorithm w/RTTM

        * New/changed items from RFC 1323.

        Vendor: The NetBSD Foundation, Inc.
        Product: NetBSD
        Version: 1.4 [1]
        Checklist items: 1 - 14

        Version: 1.3.1 and earlier
        Checklist items: 1 - 7 [2], 9 - 11, 14

        Contacts: Kevin M. Lahey <kml@...>
        Jason R. Thorpe <thorpej@...>

        [1] NetBSD 1.4 is not yet released, but the development sources which
        implement all checklist items are currently available as NetBSD 1.3E.

        [2] Window scale values > 14 are treated as 14, but not logged. This is
        changed in NetBSD 1.4, where the illegal value and the peer which
        sent it is now logged.

        Jason R. Thorpe thorpej@...
        NASA Ames Research Center Home: +1 408 866 1912
        NAS: M/S 258-5 Work: +1 650 604 0935
        Moffett Field, CA 94035 Pager: +1 415 428 6939
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