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Create: 2025-06-19 Update: 2025-07-03 01:08:29

СООТНЕСЕНИЕ РАЗЛИЧНЫХ ЭХО-ЗАПРОСОВ И ЭХО-ОТВЕТОВ ICMP

Правильный ответ на предыдущий вопрос: используется некоторый собственный механизм.

Представьте, что вы с одного устройства открыли десять окон командной строки и запустили ICMP-запросы. Разные ответы будут приходить с разными задержками, а какие-то вообще не будут приходить. И система должна корректно сопоставить запросы и ответы на них, а не расставить их наугад.

Для решения этой задачи в ICMP используется собственный механизм, схожий по принципу действия с механизмом портов в протоколах UDP и TCP. В заголовках эхо-запросов и эхо-ответов имеются поля Identifier и Sequence Number. Чаще всего используется второе поле. Ответ на конкретный запрос должен содержать то же самое значение поля Sequence Number. За счет этого и происходит сопоставление эхо-запросов и эхо-ответов ICMP.

Обязательно посмотрите на приведенный выше скриншот из Wireshark.

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ИП Скоромнов Дмитрий Анатольевич, ИНН 331403723315

Сетевой архитектор

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СООТНЕСЕНИЕ РАЗЛИЧНЫХ ЭХО-ЗАПРОСОВ И ЭХО-ОТВЕТОВ ICMP

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