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--- настройка_сети_в_linux [2022/02/23 14:06]
val [ifupdown]
+++ настройка_сети_в_linux [2025/06/24 17:41] (current)
val [Команды для диагностики]
@@ Line 3: / Line 3: @@
   * [[https://wiki.debian.org/ru/NetworkConfiguration]]
   * [[http://help.ubuntu.ru/wiki/%D0%BD%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%B9%D0%BA%D0%B0_%D1%81%D0%B5%D1%82%D0%B8_%D0%B2%D1%80%D1%83%D1%87%D0%BD%D1%83%D1%8E|Настройка сети вручную]]
+  * [[https://it-lux.ru/tcp-queue-syn-flooding/|Ошибка в логах ядра. request_sock_TCP: Possible SYN flooding]]
 ===== Команды для настройки =====
@@ Line 78: / Line 79: @@
 # ss -anptu
+# ss -lnp | grep ':80'
+# количество подключений с каждого адреса (https://serverfault.com/questions/421310/check-the-number-of-active-connections-on-port-80)
+# ss -tn src :80 or src :443 | tr -s ' ' | cut -d ' ' -f5  | cut -d ':' -f1 | sort | uniq -c | sort -n
+# отправка UDP пакета
+# echo -n "hello" >/dev/udp/195.19.40.152/5060
 </code>
@@ Line 90: / Line 98: @@
 <code>
+# hostnamectl set-hostname server.corpX.un
+# cat /etc/hostname
+</code><code>
+server.corpX.un
+</code>
 # cat /etc/hosts
 </code><code>
@@ Line 111: / Line 126: @@
 === Статическая настройка параметров ===
 <code>
-# cat /etc/hostname
-</code><code>
-server.corpX.un
-</code><code>
 # cat /etc/network/interfaces
 </code><code>
@@ Line 178: / Line 189: @@
 <code>
+client1# dhclient eth0
 client1# cat /etc/hostname
 </code><code>
@@ Line 183: / Line 196: @@
 </code><code>
 client1# :> /etc/resolv.conf
-</code><code>
+</code>
+или [[Система безопасности UNIX#Команда chattr]]
+<code>
 client1# cat /etc/hosts
 </code><code>
@@ Line 217: / Line 234: @@
   * [[https://unix.stackexchange.com/questions/588658/override-ubuntu-20-04-dns-using-systemd-resolved|Override Ubuntu 20.04 DNS using systemd-resolved]]
-=== Без cloud-init ===
+=== Использование cloud-init ===
+  * [[https://cloudinit.readthedocs.io/en/latest/tutorial/qemu.html|Core tutorial with QEMU]]
+=== Отключение cloud-init ===
 <code>
-cat /etc/cloud/cloud.cfg
+# apt purge cloud-init
-</code><code>
+</code>
-...
-preserve_hostname: true
-...
-</code><code>
-# hostnamectl set-hostname ubuntu.corpX.un
-</code><code>
-# echo 'network: {config: disabled}' > /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
-ubuntu18# rm /etc/netplan/50-cloud-init.yaml
+=== Отключение ifupdown ===
+<code>
+apt purge ifupdown
+</code>
-ubuntu20# rm /etc/netplan/00-installer-config.yaml
+=== Настройка Netplan ===
+  * [[Формат YAML]]
+  * [[https://netplan.io/faq/|Netplan FAQ]]
+  * [[https://netplan.io/examples/|Netplan configuration examples]] !!! Все варианты !!!
+<code>
+# netplan status --all
 # cat /etc/netplan/01-netcfg.yaml
@@ Line 241: / Line 265: @@
       addresses: [172.16.1.200+X/24]
       gateway4: 172.16.1.254
+#      routes:
+#        - to: default
+#          via: 172.16.1.254
 #      nameservers:
 #        addresses: [172.16.1.254]
 </code><code>
+# netplan try
 # netplan apply
+</code>
+=== Отключение Netpaln ===
+  * [[https://linuxconfig.org/how-to-switch-back-networking-to-etc-network-interfaces-on-ubuntu-20-04-focal-fossa-linux|How to switch back networking to /etc/network/interfaces on Ubuntu 20.04 Focal Fossa Linux]]
+<code>
+# apt install ifupdown net-tools
+ubuntu20/22# rm /etc/netplan/00-installer-config.yaml
+ubuntu24# rm /etc/netplan/50-cloud-init.yaml
+</code>
+=== Настройка systemd-resolved ===
+  * [[https://wiki.archlinux.org/title/Systemd-resolved_(%D0%A0%D1%83%D1%81%D1%81%D0%BA%D0%B8%D0%B9)|archlinux systemd-resolved (Русский)]]
+<code>
 # cat /etc/resolv.conf
 </code><code>
@@ Line 251: / Line 300: @@
 nameserver 127.0.0.53
 </code><code>
+# resolvectl status
+  или
+# systemd-resolve --status
 # cat /etc/systemd/resolved.conf
 </code><code>
 [Resolve]
 DNS=172.16.1.254
+</code><code>
+# systemctl restart systemd-resolved
 </code>
-=== Без Netpaln ===
+=== Отключение systemd-resolved ===
-  * [[https://linuxconfig.org/how-to-switch-back-networking-to-etc-network-interfaces-on-ubuntu-20-04-focal-fossa-linux|How to switch back networking to /etc/network/interfaces on Ubuntu 20.04 Focal Fossa Linux]]
-<code>
-# apt install ifupdown net-tools
-</code>
-=== Без systemd-resolved ===
   * [[https://gist.github.com/zoilomora/f7d264cefbb589f3f1b1fc2cea2c844c|How to disable systemd-resolved in Ubuntu]]
 <code>
-# systemctl disable systemd-resolved.service
+# systemctl disable systemd-resolved
 # systemctl stop systemd-resolved
+# rm /etc/resolv.conf    # this is link
 </code>
 ==== Файлы конфигурации CentOS/SL/RHEL ====
@@ Line 364: / Line 416: @@
-==== ifupdown ====
+==== bond ifupdown ====
 <code>
+# apt install ifenslave
 # cat /etc/network/interfaces
 </code><code>
-...
+auto lo
+iface lo inet loopback
 iface eth0 inet manual
@@ Line 385: / Line 441: @@
 </code>
-==== netplan ====
+==== bond netplan ====
 <code>
 # cat /etc/netplan/01-netcfg.yaml
@@ Line 399: / Line 455: @@
         mode: active-backup
         mii-monitor-interval: 100
+        primary: eth0
   ethernets:
     eth0: {}

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