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Давайте для начала посмотрим, что про netcat нам скажет не безизвестный ресурс Wikipedia.
Netcat – утилита Unix, позволяющая устанавливать соединения TCP и UDP, принимать оттуда данные и передавать их. Несмотря на свою полезность и простоту, данная утилита не входит ни в какой стандарт.
Netcat является своего рода швейцарским ножом при работе с TCP/IP и в руках знающего человека является грозным и крайне полезным оружием.
В данной статье мы разберем использование данной утилиты на простых примерах, которые дадут нам понимание как, где и зачем можно использовать эту замечательную штуку под названием netcat.
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Периодически у системных администраторов или у пользователей возникает необходимость подключить свой компьютер сразу в несколько сетей (VLAN-ов). Ставить отдельную сетевую карту для каждого VLAN-а не самый удобный и не самый дешевый способ решить такого рода задачу, поэтому я решил разобрать ситуацию когда наш компьютер подключен к сети через единственную физическую сетевую карту и при этом компьютер будет одновременно подключен сразу к несклольким логическим подсетям (VLAN-ам).
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Думаю каждый ИТ специалист когда-либо встречался с таким понятием как резервирование и отказоустойчивость. Представьте себе вы поддерживаете работу небольшого офиса, с одним маршрутизатором cisco в качестве шлюза в интернети несколькими коммутаторами уровня доступа. Все у вас замечательно и тут упал провайдер, который выпускал ваших сотрудников в интернет (думаю ситуация знакома каждому)...
Решил поделиться одной своей наработкой, думаю что она окажется полезной многим админам Windows сетей.
Представим ситуацию, вам требуется создать большое количество учетных записей для рабочих станций в домене Windows 30, 50 или 100 машин, создавать руками это долго и муторно, ну а если еще и правила безопасности в вашей сети настолько драконовские, что используется предварительное создание учетных записей ПК в домене, а вводить в домен, разрешено только администраторам домена, каждый раз гонять админа, вводить тачку в домен глупо, но у нас есть группа, которая занимается поддержкой пользователей назовем ее, например, Support, давать этой группе админские права- хреновая идея, т.к. в администраторы домена попадают, обычно, только доверенные сотрудники, да и техподдержке такие права для работы не требуются, а сотрудникам должны быть положены только те права, которые необходимы для выполнения их служебных обязанностей и не более того, о чем, недвусмысленно, напоминает Microsoft, в своей документации.
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Урок 3 – Первичная настройка Cisco коммутатора и маршрутизатора.
В данном уроке вы познакомитесь с несколькими полезными командами, которые используются очень часто в процессе конфигурации маршрутизаторов и коммутаторов Cisco.
Используйте дынный урок чтобы набить руку, сейчас вами должна руководить одна мысль: «знание и тысяча повторений». Это практическое упражнение поможет вам закрепить ваш навык, полученный в предыдущем уроке.
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SELECTCOUNT(1) FROM `j25_easyblog_comment` WHERE `post_id`='418' AND `published` = '1'
SELECT* FROMj25_easyblog_users WHERE `id` = '773'
SELECT* FROM `j25_users`
WHERE `id` = 773
SELECT `g`.`id`,`g`.`title`
FROM `j25_usergroups` AS g
INNERJOIN `j25_user_usergroup_map` AS m ON m.group_id = g.id
WHERE `m`.`user_id` = 773
SELECTCOUNT(1) FROM `j25_easyblog_featured` WHERE `content_id` = '362' AND `type` = 'post'
SELECT a.`id`, a.`title`, a.`alias` FROM `j25_easyblog_tag` AS a LEFTJOIN `j25_easyblog_post_tag` AS b ON a.`id` = b.`tag_id` WHERE b.`post_id` = '362' AND a.`published` = '1' ORDERBY a.`title` ASC
SELECTCOUNT(1) FROM `j25_easyblog_comment` WHERE `post_id`='362' AND `published` = '1'
select count(1) from `j25_easyblog_post` as a inner join `j25_easyblog_category` as b on a.`category_id` = b.`id` and b.`id` = '6' inner join `j25_easyblog_team_post` as c on a.`id` = c.`post_id` where a.`issitewide` = '0'
SELECT a.rules
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WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
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SELECT* FROMj25_easyblog_category WHERE `id` = '6'
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SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
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SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
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SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
SELECT* FROMj25_easyblog_category WHERE `id` = '6'
SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
SELECT* FROMj25_easyblog_category WHERE `id` = '6'
SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
SELECT* FROMj25_easyblog_category WHERE `id` = '6'
SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
SELECT* FROMj25_easyblog_category WHERE `id` = '6'
SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
SELECT* FROMj25_easyblog_category WHERE `id` = '6'
SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
SELECT* FROMj25_easyblog_category WHERE `id` = '6'
SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
SELECT* FROMj25_easyblog_category WHERE `id` = '6'
SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
SELECT* FROMj25_easyblog_category WHERE `id` = '6'
SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
SELECT* FROMj25_easyblog_category WHERE `id` = '6'
SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
SELECT a.rules
FROMj25_assetsAS a
WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
FROMj25_assets WHERE parent_id = 0
SELECT* FROMj25_easyblog_category WHERE `id` = '6'
SELECTCOUNT(1) FROM `j25_easyblog_category` WHERE `alias`='materials' AND `id`!='6'
SELECT* FROMj25_easyblog_post WHERE `id` = '428'
SELECT `id` FROM `j25_menu` WHERE `link`='index.php?option=com_easyblog&view=blogger&layout=listings&id=81' AND `published`='1' AND (`language`='en-GB' OR `language` = '*' ) LIMIT 1
SELECT a.* FROM `j25_easyblog_post` as a WHERE a.`id` ='428'
SELECT a.rules
FROMj25_assetsAS a
WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
FROMj25_assets WHERE parent_id = 0
SHOWFULLCOLUMNS FROM `j25_easyblog_tag`
SELECT* FROMj25_easyblog_tag WHERE `id` = '20'
SELECTCOUNT(1) FROM `j25_easyblog_tag` WHERE `alias`='linux' AND `id`!='20'
SELECT* FROMj25_easyblog_tag WHERE `id` = '6'
SELECTCOUNT(1) FROM `j25_easyblog_tag` WHERE `alias`='bezopasnost' AND `id`!='6'
SHOWFULLCOLUMNS FROM `j25_easyblog_ratings`
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SELECTAVG(value) AS ratings, COUNT(1) AS total FROM `j25_easyblog_ratings` WHERE `uid`='428' AND `type`='entry'
SELECT a.rules
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WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
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SELECT a.* FROM `j25_easyblog_post` as a WHERE a.`id` ='424'
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WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
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SELECT* FROMj25_easyblog_tag WHERE `id` = '72'
SELECTCOUNT(1) FROM `j25_easyblog_tag` WHERE `alias`='operatsionnye-sistemy' AND `id`!='72'
SELECT* FROMj25_easyblog_tag WHERE `id` = '14'
SELECTCOUNT(1) FROM `j25_easyblog_tag` WHERE `alias`=' set' AND `id`!='14'
SELECT* FROM `j25_easyblog_ratings` WHERE `created_by`='0' AND `uid`='424' AND `type`='entry' AND `sessionid`='814458cefae6ec2e70f10299ffe5faad'
SELECTAVG(value) AS ratings, COUNT(1) AS total FROM `j25_easyblog_ratings` WHERE `uid`='424' AND `type`='entry'
SELECT a.rules
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WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
FROMj25_assets WHERE parent_id = 0
SELECT* FROMj25_easyblog_post WHERE `id` = '422'
SELECT `id` FROM `j25_menu` WHERE `link`='index.php?option=com_easyblog&view=blogger&layout=listings&id=81' AND `published`='1' AND (`language`='en-GB' OR `language` = '*' ) LIMIT 1
SELECT a.* FROM `j25_easyblog_post` as a WHERE a.`id` ='422'
SELECT a.rules
FROMj25_assetsAS a
WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
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SELECT* FROMj25_easyblog_tag WHERE `id` = '28'
SELECTCOUNT(1) FROM `j25_easyblog_tag` WHERE `alias`='cisco' AND `id`!='28'
SELECT* FROMj25_easyblog_tag WHERE `id` = '71'
SELECTCOUNT(1) FROM `j25_easyblog_tag` WHERE `alias`='network' AND `id`!='71'
SELECT* FROMj25_easyblog_tag WHERE `id` = '56'
SELECTCOUNT(1) FROM `j25_easyblog_tag` WHERE `alias`='router' AND `id`!='56'
SELECT* FROM `j25_easyblog_ratings` WHERE `created_by`='0' AND `uid`='422' AND `type`='entry' AND `sessionid`='814458cefae6ec2e70f10299ffe5faad'
SELECTAVG(value) AS ratings, COUNT(1) AS total FROM `j25_easyblog_ratings` WHERE `uid`='422' AND `type`='entry'
SELECT a.rules
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WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
FROMj25_assets WHERE parent_id = 0
SELECT* FROMj25_easyblog_post WHERE `id` = '418'
SELECT `id` FROM `j25_menu` WHERE `link`='index.php?option=com_easyblog&view=blogger&layout=listings&id=740' AND `published`='1' AND (`language`='en-GB' OR `language` = '*' ) LIMIT 1
SELECT a.* FROM `j25_easyblog_post` as a WHERE a.`id` ='418'
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SELECTCOUNT(1) FROM `j25_easyblog_tag` WHERE `alias`='windows' AND `id`!='41'
SELECT* FROMj25_easyblog_tag WHERE `id` = '43'
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SELECTAVG(value) AS ratings, COUNT(1) AS total FROM `j25_easyblog_ratings` WHERE `uid`='418' AND `type`='entry'
SELECT a.rules
FROMj25_assetsAS a
WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
FROMj25_assets WHERE parent_id = 0
SELECT* FROMj25_easyblog_post WHERE `id` = '362'
SELECT `id` FROM `j25_menu` WHERE `link`='index.php?option=com_easyblog&view=blogger&layout=listings&id=773' AND `published`='1' AND (`language`='en-GB' OR `language` = '*' ) LIMIT 1
SELECT a.* FROM `j25_easyblog_post` as a WHERE a.`id` ='362'
SELECT a.rules
FROMj25_assetsAS a
WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
FROMj25_assets WHERE parent_id = 0
SELECT* FROMj25_easyblog_tag WHERE `id` = '55'
SELECTCOUNT(1) FROM `j25_easyblog_tag` WHERE `alias`='ios' AND `id`!='55'
SELECT* FROMj25_easyblog_tag WHERE `id` = '53'
SELECTCOUNT(1) FROM `j25_easyblog_tag` WHERE `alias`='ssh' AND `id`!='53'
SELECT* FROMj25_easyblog_tag WHERE `id` = '54'
SELECTCOUNT(1) FROM `j25_easyblog_tag` WHERE `alias`='telnet' AND `id`!='54'
SELECT* FROM `j25_easyblog_ratings` WHERE `created_by`='0' AND `uid`='362' AND `type`='entry' AND `sessionid`='814458cefae6ec2e70f10299ffe5faad'
SELECTAVG(value) AS ratings, COUNT(1) AS total FROM `j25_easyblog_ratings` WHERE `uid`='362' AND `type`='entry'
SELECT a.rules
FROMj25_assetsAS a
WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
FROMj25_assets WHERE parent_id = 0
SELECT a.rules
FROMj25_assetsAS a
WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
FROMj25_assets WHERE parent_id = 0
SELECT a.rules
FROMj25_assetsAS a
WHERE (a.id = 1)
GROUPBY a.id, a.rules, a.lft
SELECT id
FROMj25_assets WHERE parent_id = 0
SELECT* FROMj25_tagmeta_rules WHERE ( ( ('/categories/listings/materials?start=35' REGEXPBINARY url)>0 AND (case_sensitive<>0) AND (decode_url<>0) AND (request_only<>0) ) OR ( ('/categories/listings/materials?start=35' REGEXPBINARY url)>0 AND (case_sensitive<>0) AND (decode_url=0) AND (request_only<>0) ) OR ( ('https://networkdoc.ru/categories/listings/materials?start=35' REGEXPBINARY url)>0 AND (case_sensitive<>0) AND (decode_url<>0) AND (request_only=0) ) OR ( ('https://networkdoc.ru/categories/listings/materials?start=35' REGEXPBINARY url)>0 AND (case_sensitive<>0) AND (decode_url=0) AND (request_only=0) ) OR ( ('/categories/listings/materials?start=35' REGEXP url)>0 AND (case_sensitive=0) AND (decode_url<>0) AND (request_only<>0) ) OR ( ('/categories/listings/materials?start=35' REGEXP url)>0 AND (case_sensitive=0) AND (decode_url=0) AND (request_only<>0) ) OR ( ('https://networkdoc.ru/categories/listings/materials?start=35' REGEXP url)>0 AND (case_sensitive=0) AND (decode_url<>0) AND (request_only=0) ) OR ( ('https://networkdoc.ru/categories/listings/materials?start=35' REGEXP url)>0 AND (case_sensitive=0) AND (decode_url=0) AND (request_only=0) ) ) AND published=1 ORDERBY ordering
55 Query Types Logged, Sorted by Occurrences.
SELECT Tables:
36 × SELECT id FROMj25_assets
36 × SELECT a.rules FROMj25_assetsAS a
30 × SELECT* FROMj25_easyblog_category
30 × SELECTCOUNT(1) FROM `j25_easyblog_category`
12 × SELECT* FROMj25_easyblog_tag
12 × select a.`id`, a.`title`, a.`alias`, a.`private` from `j25_easyblog_category` as a
12 × select distinct a.`id`, a.`private` from `j25_easyblog_category` as a
12 × SELECTCOUNT(1) FROM `j25_easyblog_tag`
5 × SELECTCOUNT(1) FROM `j25_easyblog_comment`
5 × SELECT* FROMj25_easyblog_post
5 × SELECT a.`id`, a.`title`, a.`alias` FROM `j25_easyblog_tag` AS a LEFTJOIN `j25_easyblog_post_tag` AS b ON a.`id` = b.`tag_id`
5 × SELECTAVG(value) AS ratings, COUNT(1) AS total FROM `j25_easyblog_ratings`
5 × SELECT `id` FROM `j25_menu`
5 × SELECT* FROM `j25_easyblog_ratings`
5 × SELECT a.* FROM `j25_easyblog_post` as a
5 × SELECTCOUNT(1) FROM `j25_easyblog_featured`
3 × SELECT `g`.`id`,`g`.`title` FROM `j25_usergroups` AS g INNERJOIN `j25_user_usergroup_map` AS m ON m.group_id = g.id
3 × SELECT id FROMj25_easyblog_category
3 × SELECT* FROM `j25_users`
3 × SELECT* FROMj25_easyblog_users
2 × SELECT* FROMj25_easyblog_configs
1 × SELECT* FROMj25_tagmeta_rules
1 × SELECTCOUNT(1) FROM `j25_easyblog_category_acl`
1 × select count(1) from `j25_easyblog_post` as a inner join `j25_easyblog_category` as b on a.`category_id` = b.`id` and b.`id` = '6' inner join `j25_easyblog_team_post` as c on a.`id` = c.`post_id`
1 × SELECT* FROMj25_komento_configs
1 × SELECTCOUNT(b.`id`) AS `cnt` FROM `j25_easyblog_category` AS `a` LEFTJOIN `j25_easyblog_post` AS b ON a.`id` = b.`category_id` AND b.`published` = '1' AND b.`private` = '0'
1 × SELECT id, home, template, s.params FROMj25_template_styles as s LEFTJOINj25_extensions as e ON e.element=s.template AND e.type='template' AND e.client_id=s.client_id
1 × SELECT `id` FROM `j25_easyblog_mailq`
1 × SELECT* FROM `j25_easyblog_post`
1 × SELECT m.id, m.menutype, m.title, m.alias, m.note, m.path AS route, m.link, m.type, m.level, m.language,m.browserNav, m.access, m.params, m.home, m.img, m.template_style_id, m.component_id, m.parent_id,e.element as component FROMj25_menuAS m LEFTJOINj25_extensionsAS e ON m.component_id = e.extension_id
1 × SELECT folder AS type, element AS name, params FROMj25_extensions
1 × SELECT b.id FROMj25_usergroupsAS a LEFTJOINj25_usergroupsAS b ON b.lft <= a.lft AND b.rgt >= a.rgt
1 × SELECT id, rules FROM `j25_viewlevels
1 × SELECT b.rules FROMj25_assetsAS a LEFTJOINj25_assetsAS b ON b.lft <= a.lft AND b.rgt >= a.rgt
1 × SELECTCOUNT(*) FROM `j25_easyblog_configs`
1 × select `id` FROM `j25_easyblog_team`
1 × select distinct a.`id`, a.`private` from `j25_easyblog_category` as a left join `j25_easyblog_category_acl` as b on a.`id` = b.`category_id` and b.`acl_id` = '1'
1 × SELECTCOUNT(1) FROM `j25_easyblog_post` AS a
1 × SELECT `session_id` FROM `j25_session`
1 × SELECT id, keywords, description, indexing FROM `j25_easyblog_meta`
1 × SELECT* FROM `j25_easyblog_acl`
1 × SELECT* FROM `j25_easyblog_acl_group`
1 × SELECT a.`id` AS key1, a.*, b.`id` as key2, b.`title` as `category` FROM `j25_easyblog_post` AS a LEFTJOIN `j25_easyblog_category` AS b ON a.category_id = b.id
OTHER Tables:
1 × SHOWFULLCOLUMNS FROM `j25_users
1 × SHOWFULLCOLUMNS FROM `j25_easyblog_post
1 × SHOWFULLCOLUMNS FROM `j25_komento_configs
1 × SHOWFULLCOLUMNS FROM `j25_easyblog_tag
1 × SHOWFULLCOLUMNS FROM `j25_easyblog_ratings
1 × SHOWFULLCOLUMNS FROM `j25_easyblog_users
1 × SHOWFULLCOLUMNS FROM `j25_assets
1 × SHOWFULLCOLUMNS FROM `j25_easyblog_configs
1 × SHOWFULLCOLUMNS FROM `j25_easyblog_category
1 × DELETE FROM `j25_easyblog_mailq`
1 × UPDATE `j25_easyblog_post` SET `published` = '0'