====== Hangout 07 Feb 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]]). tjh@ will work on in next two weeks.
    * IP6 IDs (and IP IDs, maybe?): may use an insecure algorithm. Ideally, switch to some sort of per-host-pair hash?
      * Open PR by jtl@
  * Auto-window scaling: tuexen@ opened review: [[https://reviews.freebsd.org/D18375|D18375]]
  * Congestion window collapse: [[https://reviews.freebsd.org/D17614|D17614]] (review by lstewart@)
  * jtl@ to send patch to Richard for burst mitigation in the default stack
  * [[https://reviews.freebsd.org/D18811|D18811]]: standardize on snd_recover (vs. sack_newdata). Reviewer: tuexen@, lstewart@.
  * [[https://reviews.freebsd.org/D18624|D18624]]: [[https://tools.ietf.org/html/rfc6675|RFC 6675]] support. Actual functionality in [[https://reviews.freebsd.org/D18985|D18985]].
  * TCP reassembly code
    * tuexen@ will MFC. Review available in [[https://reviews.freebsd.org/D18960|D18960]].
    * bz@ found an issue with enabled debug code and doing logging. tuexen@ will talk to rrs@ about a fix for head and stable/12.
  * @tuexen RTO.Initial from 3 seconds to 1 seconds: [[https://reviews.freebsd.org/D18941|D18941]]. Before that gets committed, the SYN specific backoff factors will be removed. Without doing so, the SYN-cache lifetimes will be too short. This is done in [[https://reviews.freebsd.org/D18974|D18974]]
  * CUBIC: Only invoking %%NewReno%% after_idle, not resetting ssthreash, not resetting epoch time. Upcoming patch from Richard/Cheng. kbowling@ mentions that there were other issues in the past. Fixes: [[https://reviews.freebsd.org/D18982|D18982]] and  [[https://reviews.freebsd.org/D18954|D18954]], which will be splitted.
  * Richard will brought up a PRR patch (based on Lars work). [[https://reviews.freebsd.org/D18892|D18892]].
  * Sending on IPv4 raw sockets need more input validation: [[https://reviews.freebsd.org/D18834|D18834]].

==== New Business ====
  * [[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]].
  * Heads up: [[Hackathon/201904|Hackathon on Aberdeen]].