Différences

Ci-dessous, les différences entre deux révisions de la page.

--- informatique:system_admin:tcp [07/07/2020 07:57] – cyrille
+++ informatique:system_admin:tcp [10/11/2022 21:30] (Version actuelle) – TCP Diagram cyrille
@@ Ligne 5: / Ligne 5: @@
 Sources:
   * https://klaver.it/linux/sysctl.conf
+  * https://www.slashroot.in/linux-kernel-rpfilter-settings-reverse-path-filtering
+  * https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/
+Les valeurs sont lisibles dans ''/proc/sys/net/ipv4/''
+Sur les performances:
 <code bash>
+$ cat /etc/security/limits.d/nofile.conf
+# debian 10.4 = 1024
+* soft nofile 4096
 $ cat /etc/sysctl.d/local.conf
 # Increase number of incoming connections
+# debian 10.4 = 128
 net.core.somaxconn = 1024
 # Increase number of incoming connections backlog
+# debian 10.4 = 1000
 net.core.netdev_max_backlog = 4096
 # Decrease the time default value for tcp_fin_timeout connection
+# debian 10.4 = 60
 net.ipv4.tcp_fin_timeout = 15
 # Decrease the time default value for connections to keep alive
+# debian 10.4 = 7200
 net.ipv4.tcp_keepalive_time = 300
+# debian 10.4 = 9
 net.ipv4.tcp_keepalive_probes = 5
+# debian 10.4 = 75
 net.ipv4.tcp_keepalive_intvl = 15
 # try to reuse time-wait connections, but don't recycle them (recycle can break clients behind NAT)
-net.ipv4.tcp_tw_recycle = 0
+# debian 10.4 No such file or directory
+#net.ipv4.tcp_tw_recycle = 0
+# # debian 10.4 = 2
 net.ipv4.tcp_tw_reuse = 1
+# Limit number of orphans, each orphan can eat up to 16M (max wmem) of unswappable memory
+# debian 10.4 = 32768
+net.ipv4.tcp_max_orphans = 16384
+# debian 10.4 = 0
+#net.ipv4.tcp_orphan_retries = 0
+# How many times to retry killing an alive TCP connection
+# debian 10.4 = 15
+#net.ipv4.tcp_retries2 = 15
+# debian 10.4 = 3
+#net.ipv4.tcp_retries1 = 3
 </code>
-À avoir :
-  * tcp_keepalive_time
-  * /proc/sys/net/ipv4/tcp_tw_recycle
-  * /proc/sys/net/ipv4/tcp_tw_reuse
+{{https://upload.wikimedia.org/wikipedia/commons/f/f6/Tcp_state_diagram_fixed_new.svg}}