diff --git a/application/http_shefler_server_service.service b/application/http_shefler_server_service.service
new file mode 100644
index 0000000..54c420b
--- /dev/null
+++ b/application/http_shefler_server_service.service
@@ -0,0 +1,12 @@
+[Unit]
+Description=HTTP_Shefler_server_5000
+After=network.target
+
+[Service]
+User=shefler_1
+WorkingDirectory=/opt/http_shefler_server
+ExecStart=/usr/bin/python3 /opt/http_shefler_server/shefler_5000.py
+Restart=always
+
+[Install]
+WantedBy=multi-user.target
diff --git a/application/shefler_5000.py b/application/shefler_5000.py
new file mode 100644
index 0000000..2fc6e8c
--- /dev/null
+++ b/application/shefler_5000.py
@@ -0,0 +1,20 @@
+from flask import Flask, request, jsonify
+
+app = Flask(__name__)
+
+@app.route('/get', methods=['GET'])
+def get():
+    return jsonify({"method": "GET", "message": "Get response"}), 200
+
+@app.route('/post', methods=['POST'])
+def post():
+    data = request.get_json()
+    return jsonify({"method": "POST", "received": data}), 200
+
+@app.route('/put', methods=['PUT'])
+def put():
+    data = request.get_json()
+    return jsonify({"method": "PUT", "received": data}), 200
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=5000)
diff --git a/configs/LinuxA/00-installer-config.yaml b/configs/LinuxA/00-installer-config.yaml
new file mode 100644
index 0000000..dea1165
--- /dev/null
+++ b/configs/LinuxA/00-installer-config.yaml
@@ -0,0 +1,10 @@
+# This is the network config written by 'subiquity'
+network:
+  ethernets:
+    enp0s3:
+      dhcp4: true
+    enp0s8:
+      dhcp4: no
+      addresses: [192.168.16.10/24]
+      gateway4: 192.168.16.1
+  version: 2
diff --git a/configs/LinuxA/http_shefler_server_service.service b/configs/LinuxA/http_shefler_server_service.service
new file mode 100644
index 0000000..54c420b
--- /dev/null
+++ b/configs/LinuxA/http_shefler_server_service.service
@@ -0,0 +1,12 @@
+[Unit]
+Description=HTTP_Shefler_server_5000
+After=network.target
+
+[Service]
+User=shefler_1
+WorkingDirectory=/opt/http_shefler_server
+ExecStart=/usr/bin/python3 /opt/http_shefler_server/shefler_5000.py
+Restart=always
+
+[Install]
+WantedBy=multi-user.target
diff --git a/configs/LinuxB/00-installer-config.yaml b/configs/LinuxB/00-installer-config.yaml
new file mode 100644
index 0000000..c4f2359
--- /dev/null
+++ b/configs/LinuxB/00-installer-config.yaml
@@ -0,0 +1,12 @@
+# This is the network config written by 'subiquity'
+network:
+  ethernets:
+    enp0s3:
+      dhcp4: true
+    enp0s8:
+      dhcp4: no
+      addresses: [192.168.16.1/24]
+    enp0s9:
+      dhcp4: no
+      addresses: [192.168.3.1/24]
+  version: 2
diff --git a/configs/LinuxB/15-ip4tables b/configs/LinuxB/15-ip4tables
new file mode 100644
index 0000000..a29ab4f
--- /dev/null
+++ b/configs/LinuxB/15-ip4tables
@@ -0,0 +1,84 @@
+#!/bin/sh
+
+# This file is part of netfilter-persistent
+# (was iptables-persistent)
+# Copyright (C) 2009, Simon Richter <sjr@debian.org>
+# Copyright (C) 2010, 2014 Jonathan Wiltshire <jmw@debian.org>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation, either version 3
+# of the License, or (at your option) any later version.
+
+set -e
+
+PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+
+# Source configuration
+if [ -f "/etc/default/netfilter-persistent" ]; then
+    . /etc/default/netfilter-persistent
+fi
+
+load_rules()
+{
+    if [ "${IPTABLES_RESTORE_NOFLUSH}x" = "yesx" ]; then
+        NOFLUSH='--noflush'
+    else
+        NOFLUSH=''
+    fi
+
+    #load IPv4 rules
+    if [ ! -f /etc/iptables/rules.v4 ]; then
+        echo "Warning: skipping IPv4 (no rules to load)"
+    else
+        iptables-restore $NOFLUSH < /etc/iptables/rules.v4
+    fi
+}
+
+save_rules()
+{
+    if [ ! "${IPTABLES_SKIP_SAVE}x" = "yesx" ]; then
+        touch /etc/iptables/rules.v4
+        chmod 0640 /etc/iptables/rules.v4
+        iptables-save > /etc/iptables/rules.v4
+    fi
+}
+
+flush_rules()
+{
+    TABLES=$(iptables-save | sed -E -n 's/^\*//p')
+    for table in $TABLES
+    do
+        CHAINS=$(iptables-save -t $table | sed -E -n 's/^:([A-Z]+).*/\1/p')
+        for chain in $CHAINS
+        do
+            # policy can't be set on user-defined chains
+            iptables -t $table -P $chain ACCEPT || true
+        done
+        iptables -t $table -F
+        iptables -t $table -Z
+        iptables -t $table -X
+    done
+}
+
+case "$1" in
+start|restart|reload|force-reload)
+    load_rules
+    ;;
+save)
+    save_rules
+    ;;
+stop)
+    # Why? because if stop is used, the firewall gets flushed for a variable
+    # amount of time during package upgrades, leaving the machine vulnerable
+    # It's also not always desirable to flush during purge
+    echo "Automatic flushing disabled, use \"flush\" instead of \"stop\""
+    ;;
+flush)
+    flush_rules
+    ;;
+*)
+    echo "Usage: $0 {start|restart|reload|force-reload|save|flush}" >&2
+    exit 1
+    ;;
+esac
diff --git a/configs/LinuxB/25-ip6tables b/configs/LinuxB/25-ip6tables
new file mode 100644
index 0000000..90b213e
--- /dev/null
+++ b/configs/LinuxB/25-ip6tables
@@ -0,0 +1,87 @@
+#!/bin/sh
+
+# This file is part of netfilter-persistent
+# (was iptables-persistent)
+# Copyright (C) 2009, Simon Richter <sjr@debian.org>
+# Copyright (C) 2010, 2014 Jonathan Wiltshire <jmw@debian.org>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation, either version 3
+# of the License, or (at your option) any later version.
+
+set -e
+
+PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+
+# Exit fast if IPv6 is disabled
+test -e /proc/sys/net/ipv6 || exit 0
+
+# Source configuration
+if [ -f "/etc/default/netfilter-persistent" ]; then
+    . /etc/default/netfilter-persistent
+fi
+
+load_rules()
+{
+    if [ "${IP6TABLES_RESTORE_NOFLUSH}x" = "yesx" ]; then
+        NOFLUSH='--noflush'
+    else
+        NOFLUSH=''
+    fi
+
+    #load IPv6 rules
+    if [ ! -f /etc/iptables/rules.v6 ]; then
+        echo "Warning: skipping IPv6 (no rules to load)"
+    else
+        ip6tables-restore $NOFLUSH < /etc/iptables/rules.v6
+    fi
+}
+
+save_rules()
+{
+    if [ ! "${IP6TABLES_SKIP_SAVE}x" = "yesx" ]; then
+        touch /etc/iptables/rules.v6
+        ip6tables-save > /etc/iptables/rules.v6
+        chmod 0640 /etc/iptables/rules.v6
+    fi
+}
+
+flush_rules()
+{
+    TABLES=$(ip6tables-save | sed -E -n 's/^\*//p')
+    for table in $TABLES
+    do
+        CHAINS=$(ip6tables-save -t $table | sed -E -n 's/^:([A-Z]+).*/\1/p')
+        for chain in $CHAINS
+        do
+            # policy can't be set on user-defined chains
+            ip6tables -t $table -P $chain ACCEPT || true
+        done
+        ip6tables -t $table -F
+        ip6tables -t $table -Z
+        ip6tables -t $table -X
+    done
+}
+
+case "$1" in
+start|restart|reload|force-reload)
+    load_rules
+    ;;
+save)
+    save_rules
+    ;;
+stop)
+    # Why? because if stop is used, the firewall gets flushed for a variable
+    # amount of time during package upgrades, leaving the machine vulnerable
+    # It's also not always desirable to flush during purge
+    echo "Automatic flushing disabled, use \"flush\" instead of \"stop\""
+    ;;
+flush)
+    flush_rules
+    ;;
+*)
+    echo "Usage: $0 {start|restart|reload|force-reload|save|flush}" >&2
+    exit 1
+    ;;
+esac
diff --git a/configs/LinuxB/99-sysctl.conf b/configs/LinuxB/99-sysctl.conf
new file mode 100644
index 0000000..b41f07b
--- /dev/null
+++ b/configs/LinuxB/99-sysctl.conf
@@ -0,0 +1,68 @@
+#
+# /etc/sysctl.conf - Configuration file for setting system variables
+# See /etc/sysctl.d/ for additional system variables.
+# See sysctl.conf (5) for information.
+#
+
+#kernel.domainname = example.com
+
+# Uncomment the following to stop low-level messages on console
+#kernel.printk = 3 4 1 3
+
+##############################################################3
+# Functions previously found in netbase
+#
+
+# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
+# Turn on Source Address Verification in all interfaces to
+# prevent some spoofing attacks
+#net.ipv4.conf.default.rp_filter=1
+#net.ipv4.conf.all.rp_filter=1
+
+# Uncomment the next line to enable TCP/IP SYN cookies
+# See http://lwn.net/Articles/277146/
+# Note: This may impact IPv6 TCP sessions too
+#net.ipv4.tcp_syncookies=1
+
+# Uncomment the next line to enable packet forwarding for IPv4
+net.ipv4.ip_forward=1
+
+# Uncomment the next line to enable packet forwarding for IPv6
+#  Enabling this option disables Stateless Address Autoconfiguration
+#  based on Router Advertisements for this host
+#net.ipv6.conf.all.forwarding=1
+
+
+###################################################################
+# Additional settings - these settings can improve the network
+# security of the host and prevent against some network attacks
+# including spoofing attacks and man in the middle attacks through
+# redirection. Some network environments, however, require that these
+# settings are disabled so review and enable them as needed.
+#
+# Do not accept ICMP redirects (prevent MITM attacks)
+#net.ipv4.conf.all.accept_redirects = 0
+#net.ipv6.conf.all.accept_redirects = 0
+# _or_
+# Accept ICMP redirects only for gateways listed in our default
+# gateway list (enabled by default)
+# net.ipv4.conf.all.secure_redirects = 1
+#
+# Do not send ICMP redirects (we are not a router)
+#net.ipv4.conf.all.send_redirects = 0
+#
+# Do not accept IP source route packets (we are not a router)
+#net.ipv4.conf.all.accept_source_route = 0
+#net.ipv6.conf.all.accept_source_route = 0
+#
+# Log Martian Packets
+#net.ipv4.conf.all.log_martians = 1
+#
+
+###################################################################
+# Magic system request Key
+# 0=disable, 1=enable all, >1 bitmask of sysrq functions
+# See https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html
+# for what other values do
+#kernel.sysrq=438
+
diff --git a/configs/LinuxC/00-installer-config.yaml b/configs/LinuxC/00-installer-config.yaml
new file mode 100644
index 0000000..9e51ca6
--- /dev/null
+++ b/configs/LinuxC/00-installer-config.yaml
@@ -0,0 +1,10 @@
+# This is the network config written by 'subiquity'
+network:
+  ethernets:
+    enp0s3:
+      dhcp4: true
+    enp0s8:
+      dhcp4: no
+      addresses: [192.168.3.100/24]
+      gateway4: 192.168.3.1
+  version: 2
diff --git a/report.md b/report.md
new file mode 100644
index 0000000..04f97d6
--- /dev/null
+++ b/report.md
@@ -0,0 +1,144 @@
+# ОТЧЕТ ПО ПРАКТИКЕ LINUX ШЕФЛЕР
+### Общая информация
+Дата рождения: 16  
+Месяц рождения: 3  
+ip - адреса машин на сетевом мосту:
+    LinuxA: 192.168.0.113
+    LinuxB: 192.168.0.114
+    LinuxC: 192.168.0.104
+## Linux A
+### Информация о машине:
+Имя хоста: shefler_server  
+Имя пользователя shefler_1  
+Пароль: shefler_1  
+1. Настроим сетевые интерфейсы машины: Сетевой мост и Внутреннюю сеть (servernet):  
+    
+    ![Сетевой мост LinuxA](screenshots/LinuxA_screen/1.1.png)  
+    ![Внутренняя сеть LinuxA](screenshots/LinuxA_screen/1.2.png)  
+2. Пробуем пинговать машину с хоста:  
+    
+    ![Пинг LinuxA с хоста](screenshots/LinuxA_screen/3.png)  
+3. Генерируем и копируем ключ для доступа по ssh, что затем поможет подключаться соответствующим образом с хоста:  
+
+    ![Генерация и копирование SSH-ключа](screenshots/LinuxA_screen/4.png)  
+4. Настраиваем сеть открыв конфигурационный файл 00-installer-config.yaml с помощью sudo nano /etc/netplan/00-installer-config.yaml:  
+
+    ![Конфигурационный файл LinuxA](screenshots/LinuxA_screen/5_попытка.png)  
+5. Примерим настройки и проверим их с помощью sudo netplan apply и ip addr:  
+
+    ![Проверка конфигурации LinuxA](screenshots/LinuxA_screen/5-6.png)  
+6. Настроим веб-сервер при помощи python flask. Для этого сначала проведем установку:  
+
+    ![Установка flask1](screenshots/LinuxA_screen/install_flask1.png)  
+    ![Установка flask1](screenshots/LinuxA_screen/install_flask2.png)  
+7. Создадим директорию для сервера, а в ней файл shefler_5000.py:  
+
+    ![Создание shefler_5000.py](screenshots/LinuxA_screen/making_shefler_5000.py.png)  
+8. Запишем в файл следующее содержание:  
+
+    ![Создание shefler_5000.py](screenshots/LinuxA_screen/shefler_5000.py.png)  
+9. Создадим systemd unit файл для автоматического запуска сервера:  
+
+    ![Создание systemd unit файла](screenshots/LinuxA_screen/http_shefler_server_service.service.png)  
+10. Запустим и посмотрим на результат:
+
+    ![Запуск сервера](screenshots/LinuxA_screen/start_service.png)  
+    ![Результат запуска](screenshots/LinuxA_screen/service_working.png)  
+## Linux B
+### Информация о машине:
+Имя хоста: shefler_gateway  
+Имя пользователя shefler_2  
+Пароль: shefler_2  
+1. Настроим сетевые интерфейсы машины: Сетевой мост и Внутреннюю сеть (servernet и clientnet):  
+    
+    ![Сетевой мост LinuxB](screenshots/LinuxB_screen/1.1.png)  
+    ![Внутренняя сеть LinuxB (servernet)](screenshots/LinuxB_screen/1.2.png)  
+    ![Внутренняя сеть LinuxB (clientnet)](screenshots/LinuxB_screen/1.3.png)  
+2. Убеждаемся, что один из интерфейсов подключен к той же подсети, что и хост. Запоминаем ip адрес:  
+
+    ![Ip - адреса](screenshots/LinuxB_screen/2.png)  
+3. Генерируем и копируем ключ для доступа по ssh, что затем поможет подключаться соответствующим образом с хоста:  
+
+    ![Генерация и копирование SSH-ключа](screenshots/LinuxB_screen/3.png)  
+4. Настраиваем сеть открыв конфигурационный файл 00-installer-config.yaml с помощью sudo nano /etc/netplan/00-installer-config.yaml:  
+
+    ![Конфигурационный файл LinuxB](screenshots/LinuxB_screen/4.png)  
+5. Применим настройки и проверим их с помощью sudo netplan apply и ip addr:  
+
+    ![Проверка конфигурации LinuxB](screenshots/LinuxB_screen/6.png)  
+6. Включим IP Forwarding c помощью редактирования sysctl.conf, а затем проверим:  
+
+    ![Редактирование файла sysctl.conf](screenshots/LinuxB_screen/Включение_ip_forvarding.png)  
+    ![Проверка результата](screenshots/LinuxB_screen/Включение_ip_forvarding_2.png)  
+7. Для настройки маршрута внесем правила в ip tables и проведем проверку, а также сохраним в файлы 15-ip4tables и 25-ip6tables:  
+
+    ![Проверка результата](screenshots/LinuxB_screen/маршруты.png)  
+## Linux C
+### Информация о машине:
+Имя хоста: shefler_client  
+Имя пользователя shefler_3  
+Пароль: shefler_3  
+1. Настроим сетевые интерфейсы машины: Сетевой мост и Внутреннюю сеть (clientnet):  
+    
+    ![Сетевой мост LinuxC](screenshots/LinuxC_screen/1.1.png)  
+    ![Внутренняя сеть LinuxC](screenshots/LinuxC_screen/1.2.png)  
+2. Генерируем и копируем ключ для доступа по ssh, что затем поможет подключаться соответствующим образом с хоста:  
+
+    ![Генерация и копирование SSH-ключа](screenshots/LinuxC_screen/3.png)  
+3. Настраиваем сеть открыв конфигурационный файл 00-installer-config.yaml с помощью sudo nano /etc/netplan/00-installer-config.yaml:  
+
+    ![Конфигурационный файл LinuxC](screenshots/LinuxC_screen/4.png)  
+4. Примерим настройки и проверим их с помощью sudo netplan apply и ip addr:  
+
+    ![Проверка конфигурации LinuxC](screenshots/LinuxC_screen/6.png)  
+5. Для копирования файлов с виртуальных машин на хост используется WinSCP:  
+
+    ![WinSCP](screenshots/LinuxC_screen/WinSCP.png)  
+6. Установим curl:  
+
+    ![Установка curl на клиент](screenshots/LinuxC_screen/Загрузка_curl.png)  
+## Тестирование
+1. Запустим утилиту tcpdump на LinuxB:  
+
+    ![Запуск утилиты](screenshots/Testing_screen/LinuxB_запуск_tcpdump.png)  
+2. Отправим ряд curl-запросов с клиента (LinuxC) на cервер LinuxA для проверки:  
+    2.1. GET:  
+
+    ![Get1](screenshots/Testing_screen/Get1.png)  
+    ![Get2](screenshots/Testing_screen/Get2.png)  
+    2.2. POST:  
+
+    ![Post1](screenshots/Testing_screen/Post1.png)  
+    ![Post2](screenshots/Testing_screen/Post2.png)  
+    2.3. PUT:  
+
+    ![Put1](screenshots/Testing_screen/Put1.png)  
+    ![Put2](screenshots/Testing_screen/Put2.png)  
+    При прослушивании трафика через tcpdump видно последовательную смену TCP-флагов (SYN → SYN-ACK → ACK → PSH/ACK), что подтверждает успешное установление соединения и обмен данными между клиентом и сервером.  
+3. Проверим блокировку трафику шлюзом попытавшись произвести пинг сервера клиентом:  
+
+    ![Проверка блокировки трафика](screenshots/Testing_screen/проверка_блокировки.png)  
+## Тестирование после перезагрузки
+Послее перезагрузки всех машин проверим, что их настройки сохранены  
+
+1. Проверим активен ли IP Forwarding, а также iptables на шлюзе:
+
+    ![Проверка IP Forwarding](screenshots/Reboot_screen/1.png)  
+2. Проверка того, запущен ли веб-сервер:
+    ![Проверка веб-сервер](screenshots/Reboot_screen/2.png)  
+3. Произведем тестовый запрос с клиента на сервер:  
+    ![Проверка curl1](screenshots/Reboot_screen/3.png)  
+    ![Проверка curl2](screenshots/Reboot_screen/4.png)  
+
+Таким образом, после перезагрузки все настройки сохраняются.
+## Заключение  
+
+В ходе выполнения практической работы были развернуты три виртуальные машины Linux (Server, Gateway, Client) и настроена их сетевая связность в соответствии с заданной схемой.
+
+На машине Linux A был развернут HTTP-сервер на базе Flask, реализующий обработку запросов GET, POST и PUT на порту 5000. Для обеспечения автоматического запуска сервиса при загрузке системы был создан systemd unit.
+
+На машине Linux B была выполнена настройка маршрутизации между подсетями с использованием IP forwarding и правил iptables, обеспечивающих передачу только HTTP-трафика через порт 5000. Дополнительно была настроена фильтрация и мониторинг трафика с использованием tcpdump.
+
+На машине Linux C была выполнена настройка сетевых интерфейсов и проверка взаимодействия с сервером с помощью утилиты curl.
+
+В результате тестирования подтверждена корректная работа сетевой архитектуры: клиент успешно отправляет HTTP-запросы к серверу через шлюз, а весь трафик проходит через настроенные правила маршрутизации. Также установлено, что после перезагрузки системы все конфигурации сохраняются и функционируют корректно.
\ No newline at end of file
diff --git a/screenshots/LinuxA_screen/1.1.png b/screenshots/LinuxA_screen/1.1.png
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