====== Hangout 25 April 2019 ======

==== Old Business ====

  * IPv6 Fragment reviews which need testing:
    * Eliminate KAME circular queues: [[https://reviews.freebsd.org/D16847|D16847]].
    * Drop packets with overlapping fragments: [[https://reviews.freebsd.org/D16850|D16850]].
  * IPv6 modernization project: [[/IPv6|Wiki Page]]
    * Julius proposed importing %%OpenBSD%% fragmentation regression test cases (see [[https://reviews.freebsd.org/D17376|D17376]]). thj@ is working on it.
    * IP6 IDs (and IP IDs, maybe?): may use an insecure algorithm. Ideally, switch to some sort of per-host-pair hash?
      * What do %%OpenBSD%%/%%NetBSD%% do?
      * Perhaps, a small cache would be sufficient?
  * Congestion window collapse: [[https://reviews.freebsd.org/D17614|D17614]] (review by lstewart@)
    * @tuexen to commit
  * jtl@ to send patch to Richard for burst mitigation in the default stack. An idea is in [[https://reviews.freebsd.org/D19047|D19047]].
    * Still need to do. :-(
  * [[https://reviews.freebsd.org/D18811|D18811]]: standardize on snd_recover (vs. sack_newdata). Reviewer: tuexen@, lstewart@.
    * @tuexen will review again.
  * [[https://reviews.freebsd.org/D18624|D18624]]: [[https://tools.ietf.org/html/rfc6675|RFC 6675]] support. Actual functionality in [[https://reviews.freebsd.org/D18985|D18985]].
    * Helps when HW LRO is enabled.
    * Also, this enables a PRR patch (based on Lars work). [[https://reviews.freebsd.org/D18892|D18892]]. Needs review.
  * CUBIC: Only invoking %%NewReno%% after_idle, not resetting ssthreash, not resetting epoch time: [[https://reviews.freebsd.org/D18982|D18982]],  [[https://reviews.freebsd.org/D18954|D18954]], and [[https://reviews.freebsd.org/D19118|D19118]]. Including another issue, this will be discussed at the IETF.
    * lstewart@ is the best person to review this.
  * [[https://reviews.freebsd.org/D19000|D19000]] deal with a bug that the 1 byte occupied in the sequence number space by SYN segments results in a cwnd increase when acked. This bug exists only on the server side. tuexen@ and Richard are working on it.
  * Richard is working on burst mitigation. An initial version (WIP) is available as [[https://reviews.freebsd.org/D19047|D19047]].

==== New Things ====
  * [[https://reviews.freebsd.org/D20028|D20028]]: NUMA aware INPCB
  * Can we lower TIME_WAIT?
  * tun/tap interfaces: should we see outgoing packets in tcpdump? @tuexen will add

==== Next Meeting ====
Scheduled for 9 May, 14:00 UTC.