Сетевой архитектор | United States America (US)

Create: 2025-03-31 Update: 2025-07-02 20:04:34

ВОЗМОЖНЫЕ MAC-АДРЕСА ОТПРАВИТЕЛЕЙ

Посмотрите приведенные выше скриншоты.

На одном скриншоте представлена таблица, из которой видно, что широковещательные и групповые адреса не могут быть отправителями кадров. Что более чем логично.

А на другом скриншоте представлен кадр в отображении Wireshark, у которого MAC-адресом отправителя является групповой адрес из второго варианта ответа (3D-7C-3F-F5-7F-6E). На скриншоте явным образом видно, что Wireshark говорит, что такой MAC-адрес не может быть адресом отправителя кадра, т.к. он является групповым адресом.

Исходя из приведенной выше информации, следующие MAC-адреса не могут быть адресами – отправителями кадров:
* 3D-7C-3F-F5-7F-6E и 3F-7C-3F-F5-7F-6E, т.к. являются многоадресными адресами.
* FF:FF:FF:FF:FF:FF, т.к. является широковещательным адресом.

В следующем посте я расскажу, как отличить одноадресный кадр от многоадресного, а также расскажу о том, почему MAC-адрес 3E-7C-3F-F5-7F-6E не может быть назначен сетевому интерфейсу при производстве, несмотря на то что он является одноадресным.

P. S. О том, как я создал кадр с многоадресным адресом отправителя, я писал на канале "MikroTik сэнсей" в этом посте.

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ИП Скоромнов Дмитрий Анатольевич, ИНН 331403723315

Сетевой архитектор

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ВОЗМОЖНЫЕ MAC-АДРЕСА ОТПРАВИТЕЛЕЙ

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