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Subject[DOCUMENTATION PATCH] Missing net sysctls, some fixed, rest flagged
Dave, Lists, 

I ran the following (crappy) script:

for b in $(for a in $(find | grep -v eth0 | grep -v binfmt)
do
basename $a
done | sort -u);
do
if rgrep -q $b ~/download/linux-2.6.6/Documentation/
then
touch /tmp/script
else
echo $b missing
fi
done

In /proc/sys/ and found a host of undocumented sysctls. This patch documents
a number of them, and at least mentions the rest as 'TODO'. Please verify my
code-inspired documentation before applying!

--- linux-2.6.6/Documentation/networking/ip-sysctl.txt.ahu 2004-06-09 18:53:29.000000000 +0200
+++ linux-2.6.6/Documentation/networking/ip-sysctl.txt 2004-06-09 19:46:15.000000000 +0200
@@ -17,6 +17,16 @@
Disable Path MTU Discovery.
default FALSE

+min_pmtu - INTEGER
+ default 562 - minimum discovered Path MTU
+
+mtu_expires - INTEGER
+ FIXME: unknown
+
+min_adv_mss - INTEGER
+ The advertised MSS depends on the first hop route MTU, but will
+ never be lower than this setting
+
IP Fragmentation:

ipfrag_high_thresh - INTEGER
@@ -340,6 +350,17 @@
more rapidly.
Default: 1

+
+tcp_frto - BOOLEAN
+ Enables F-RTO, an enhanced recovery algorithm for TCP retransmission
+ timeouts
+
+somaxconn - INTEGER
+ Limit of TCP listen backlog, known in userspace as SOMAXCONN.
+ Defaults to 128
+
+IP Variables:
+
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
@@ -581,6 +602,19 @@
The max value from conf/{all,interface}/arp_ignore is used
when ARP request is received on the {interface}

+app_solicit - INTEGER
+ The maximum number of probes to send to the user space ARP daemon
+ via netlink before dropping back to multicast probes (see
+ mcast_solicit). Defaults to 0.
+
+disable_policy - BOOLEAN
+ Disable IPSEC policy (SPD) for this interface
+
+disable_xfrm - BOOLEAN
+ Disable IPSEC encryption on this interface, whatever the policy
+
+
+
tag - INTEGER
Allows you to write a number, which can be used as required.
Default value is 0.
@@ -799,4 +833,25 @@
Default: 1


+UNDOCUMENTED:
+
+dev_weight FIXME
+discovery_slots FIXME
+discovery_timeout FIXME
+fast_poll_increase FIXME
+ip6_queue_maxlen FIXME
+lap_keepalive_time FIXME
+lo_cong FIXME
+max_baud_rate FIXME
+max_dgram_qlen FIXME
+max_noreply_time FIXME
+max_tx_data_size FIXME
+max_tx_window FIXME
+min_tx_turn_time FIXME
+mod_cong FIXME
+no_cong FIXME
+no_cong_thresh FIXME
+slot_timeout FIXME
+warn_noreply_time FIXME
+
$Id: ip-sysctl.txt,v 1.20 2001/12/13 09:00:18 davem Exp $
--- linux-2.6.6/Documentation/filesystems/proc.txt.ahu 2004-06-09 19:31:17.000000000 +0200
+++ linux-2.6.6/Documentation/filesystems/proc.txt 2004-06-09 19:32:09.000000000 +0200
@@ -1628,7 +1628,8 @@

Writing to this file results in a flush of the routing cache.

-gc_elastic, gc_interval, gc_min_interval, gc_tresh, gc_timeout
+gc_elasticity, gc_interval, gc_min_interval, gc_tresh, gc_timeout,
+gc_thresh, gc_thresh1, gc_thresh2, gc_thresh3
--------------------------------------------------------------

Values to control the frequency and behavior of the garbage collection

--
http://www.PowerDNS.com Open source, database driven DNS Software
http://lartc.org Linux Advanced Routing & Traffic Control HOWTO
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