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Subject: [Bug 219655] TCP Connection Limit Error - sonewconn: Listen queue
 overflow
Date: Wed, 31 May 2017 15:12:08 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D219655

--- Comment #13 from Eugene Grosbein <eugen@freebsd.org> ---
(In reply to Bjoern A. Zeeb from comment #12)

These variables are global currently but this does not mean the limits they
impose are "global" in any way: static u_int somaxconn is just default for
per-socket backlog limit so->so_qlimit (struct socket *so) and this change
makes it possible to assign different defaults per-jail.

Yes, increase of such limit allows jailed root to get more space in the que=
ue
of not accepted yet sockets but theres is already plenty ways to consume su=
ch
resources (f.e. by creating listening socket and making tons of local
connections). Perhaps, this sysctl should be made read-only for jailed root=
, if
possible.

V_numopensockets is purely informational.

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