net: Fix a documentation bug wrt. ip_unprivileged_port_start

[linux.git] / Documentation / networking / ip-sysctl.txt

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 0b0feb5b6b0096d1f0d5d8d23a4fbc1f2e3fcae1..fd26788e8c96c66716babef9683733af4deefb1a 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -904,8 +904,9 @@ ip_local_port_range - 2 INTEGERS
        Defines the local port range that is used by TCP and UDP to
        choose the local port. The first number is the first, the
        second the last local port number.
-       If possible, it is better these numbers have different parity.
-       (one even and one odd values)
+       If possible, it is better these numbers have different parity
+       (one even and one odd value).
+       Must be greater than or equal to ip_unprivileged_port_start.
        The default values are 32768 and 60999 respectively.
 
 ip_local_reserved_ports - list of comma separated ranges
@@ -943,8 +944,8 @@ ip_unprivileged_port_start - INTEGER
        This is a per-namespace sysctl.  It defines the first
        unprivileged port in the network namespace.  Privileged ports
        require root or CAP_NET_BIND_SERVICE in order to bind to them.
-       To disable all privileged ports, set this to 0.  It may not
-       overlap with the ip_local_reserved_ports range.
+       To disable all privileged ports, set this to 0.  They must not
+       overlap with the ip_local_port_range.
 
        Default: 1024
 
@@ -2195,6 +2196,18 @@ pf_retrans - INTEGER
 
        Default: 0
 
+ps_retrans - INTEGER
+       Primary.Switchover.Max.Retrans (PSMR), it's a tunable parameter coming
+       from section-5 "Primary Path Switchover" in rfc7829.  The primary path
+       will be changed to another active path when the path error counter on
+       the old primary path exceeds PSMR, so that "the SCTP sender is allowed
+       to continue data transmission on a new working path even when the old
+       primary destination address becomes active again".   Note this feature
+       is disabled by initializing 'ps_retrans' per netns as 0xffff by default,
+       and its value can't be less than 'pf_retrans' when changing by sysctl.
+
+       Default: 0xffff
+
 rto_initial - INTEGER
        The initial round trip timeout value in milliseconds that will be used
        in calculating round trip times.  This is the initial time interval