Diffstat (limited to 'Documentation/networking/ip-sysctl.txt')
1 files changed, 19 insertions, 6 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index cb7f3148035..ad3e80e17b4 100644
@@ -20,7 +20,7 @@ ip_no_pmtu_disc - BOOLEAN
min_pmtu - INTEGER
- default 562 - minimum discovered Path MTU
+ default 552 - minimum discovered Path MTU
route/max_size - INTEGER
Maximum number of routes allowed in the kernel. Increase
@@ -31,6 +31,16 @@ neigh/default/gc_thresh3 - INTEGER
when using large numbers of interfaces and when communicating
with large numbers of directly-connected peers.
+neigh/default/unres_qlen_bytes - INTEGER
+ The maximum number of bytes which may be used by packets
+ queued for each unresolved address by other network layers.
+ (added in linux 3.3)
+neigh/default/unres_qlen - INTEGER
+ The maximum number of packets which may be queued for each
+ unresolved address by other network layers.
+ (deprecated in linux 3.3) : use unres_qlen_bytes instead.
mtu_expires - INTEGER
Time, in seconds, that cached PMTU information is kept.
@@ -165,6 +175,9 @@ tcp_congestion_control - STRING
connections. The algorithm "reno" is always available, but
additional choices may be available based on kernel configuration.
Default is set as part of kernel configuration.
+ For passive connections, the listener congestion control choice
+ is inherited.
+ [see setsockopt(listenfd, SOL_TCP, TCP_CONGESTION, "name" ...) ]
tcp_cookie_size - INTEGER
Default size of TCP Cookie Transactions (TCPCT) option, that may be
@@ -282,11 +295,11 @@ tcp_max_ssthresh - INTEGER
Default: 0 (off)
tcp_max_syn_backlog - INTEGER
- Maximal number of remembered connection requests, which are
- still did not receive an acknowledgment from connecting client.
- Default value is 1024 for systems with more than 128Mb of memory,
- and 128 for low memory machines. If server suffers of overload,
- try to increase this number.
+ Maximal number of remembered connection requests, which have not
+ received an acknowledgment from connecting client.
+ The minimal value is 128 for low memory machines, and it will
+ increase in proportion to the memory of machine.
+ If server suffers from overload, try increasing this number.
tcp_max_tw_buckets - INTEGER
Maximal number of timewait sockets held by system simultaneously.