Re: network outages

[Greg Troxel <gdt%lexort.com@localhost>]

Cleaning up my test case:

  NetBSD 11 RC2, amd64, XEN3_DOMU

  (dom0 is NetBSD 10, probably doesn't matter)

  sysctl.conf is stock, plus setting hw.cnmagic

  opening a tcp connection to a remote system works after boot.  no
  evidence of trouble.

  Doing only
    sysctl -w net.inet.tcp.recvspace=209716
  leads to ENOBUFS for outbound tcp (from a simple test program that
    opens, writes, closes, aimed at remote discard).

  sshd still works, even new inbound connections, but idk if sshd sets
  buffer sizes (would not surprise me).

  ssh outbound fails with ENOBUFS
  
  "iperf -s" fails with ENOBUFS