{"id":2173,"date":"2020-04-03T09:35:12","date_gmt":"2020-04-03T07:35:12","guid":{"rendered":"https:\/\/www.nico-maas.de\/?p=2173"},"modified":"2020-04-03T09:35:13","modified_gmt":"2020-04-03T07:35:13","slug":"bash-for-sending-and-receiving-raw-ip-packets","status":"publish","type":"post","link":"https:\/\/www.nico-maas.de\/?p=2173","title":{"rendered":"Bash for sending and receiving raw IP packets"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">I stumbled across this feature during my bachelor studies:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>echo \"Hello World\" > \/dev\/tcp\/127.0.0.1\/5000\necho \"Hello World\" > \/dev\/udp\/127.0.0.1\/5000<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">You need to be root (obviously) and its supported in bash environment - but not on all systems. You can also cat on the ports and use dns adresses. Its neat to just get a byte out :).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And if you need something more sophisicated, be sure to use the good old netcat (\"nc\")<\/p>\n<div class=\"shariff shariff-align-left shariff-widget-align-left\"><ul class=\"shariff-buttons theme-round orientation-horizontal buttonsize-small\"><li class=\"shariff-button printer shariff-nocustomcolor\" style=\"background-color:#a8a8a8\"><a href=\"javascript:window.print()\" title=\"print\" aria-label=\"print\" role=\"button\" rel=\"noopener nofollow\" class=\"shariff-link\" style=\"; background-color:#999; color:#fff\"><span class=\"shariff-icon\" style=\"\"><svg width=\"32px\" height=\"20px\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 30 32\"><path fill=\"#999\" d=\"M6.8 27.4h16v-4.6h-16v4.6zM6.8 16h16v-6.8h-2.8q-0.7 0-1.2-0.5t-0.5-1.2v-2.8h-11.4v11.4zM27.4 17.2q0-0.5-0.3-0.8t-0.8-0.4-0.8 0.4-0.3 0.8 0.3 0.8 0.8 0.3 0.8-0.3 0.3-0.8zM29.7 17.2v7.4q0 0.2-0.2 0.4t-0.4 0.2h-4v2.8q0 0.7-0.5 1.2t-1.2 0.5h-17.2q-0.7 0-1.2-0.5t-0.5-1.2v-2.8h-4q-0.2 0-0.4-0.2t-0.2-0.4v-7.4q0-1.4 1-2.4t2.4-1h1.2v-9.7q0-0.7 0.5-1.2t1.2-0.5h12q0.7 0 1.6 0.4t1.3 0.8l2.7 2.7q0.5 0.5 0.9 1.4t0.4 1.6v4.6h1.1q1.4 0 2.4 1t1 2.4z\"\/><\/svg><\/span><\/a><\/li><li class=\"shariff-button mailto shariff-nocustomcolor\" style=\"background-color:#a8a8a8\"><a href=\"mailto:?body=https%3A%2F%2Fwww.nico-maas.de%2F%3Fp%3D2173&subject=Bash%20for%20sending%20and%20receiving%20raw%20IP%20packets\" title=\"Send by email\" aria-label=\"Send by email\" role=\"button\" rel=\"noopener nofollow\" class=\"shariff-link\" style=\"; 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You can also cat on the ports and use dns adresses. Its neat to just get a byte out :). And if you need something more sophisicated, be &hellip; <a href=\"https:\/\/www.nico-maas.de\/?p=2173\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Bash for sending and receiving raw IP packets<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n<div class=\"shariff shariff-align-left shariff-widget-align-left\"><ul class=\"shariff-buttons theme-round orientation-horizontal buttonsize-small\"><li class=\"shariff-button printer shariff-nocustomcolor\" style=\"background-color:#a8a8a8\"><a href=\"javascript:window.print()\" title=\"print\" aria-label=\"print\" role=\"button\" rel=\"noopener nofollow\" class=\"shariff-link\" style=\"; background-color:#999; color:#fff\"><span class=\"shariff-icon\" style=\"\"><svg width=\"32px\" height=\"20px\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 30 32\"><path fill=\"#999\" d=\"M6.8 27.4h16v-4.6h-16v4.6zM6.8 16h16v-6.8h-2.8q-0.7 0-1.2-0.5t-0.5-1.2v-2.8h-11.4v11.4zM27.4 17.2q0-0.5-0.3-0.8t-0.8-0.4-0.8 0.4-0.3 0.8 0.3 0.8 0.8 0.3 0.8-0.3 0.3-0.8zM29.7 17.2v7.4q0 0.2-0.2 0.4t-0.4 0.2h-4v2.8q0 0.7-0.5 1.2t-1.2 0.5h-17.2q-0.7 0-1.2-0.5t-0.5-1.2v-2.8h-4q-0.2 0-0.4-0.2t-0.2-0.4v-7.4q0-1.4 1-2.4t2.4-1h1.2v-9.7q0-0.7 0.5-1.2t1.2-0.5h12q0.7 0 1.6 0.4t1.3 0.8l2.7 2.7q0.5 0.5 0.9 1.4t0.4 1.6v4.6h1.1q1.4 0 2.4 1t1 2.4z\"\/><\/svg><\/span><\/a><\/li><li class=\"shariff-button mailto shariff-nocustomcolor\" style=\"background-color:#a8a8a8\"><a href=\"mailto:?body=https%3A%2F%2Fwww.nico-maas.de%2F%3Fp%3D2173&subject=Bash%20for%20sending%20and%20receiving%20raw%20IP%20packets\" title=\"Send by email\" aria-label=\"Send by email\" role=\"button\" rel=\"noopener nofollow\" class=\"shariff-link\" style=\"; 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May 2016","format":false,"excerpt":"As a network admin, you're going to have at least one Freeradius running, mostly for 802.1x authentication. At my place the problem arised, that the service was down too often - for different reasons. 1.) Logrotate If you're using logrotate, you should check out \/etc\/logrotate.d\/freeradius: \/var\/log\/freeradius\/*.log { weekly rotate 52\u2026","rel":"","context":"In &quot;Network&quot;","block_context":{"text":"Network","link":"https:\/\/www.nico-maas.de\/?cat=32"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":427,"url":"https:\/\/www.nico-maas.de\/?p=427","url_meta":{"origin":2173,"position":1},"title":"Rooting CUCM7 &#038; Giving BASH instead of the restricted CLI","author":"Nico Maas","date":"19. February 2010","format":false,"excerpt":"1. Boot with gparted 2. cd \/tmp 3. mkdir test 4. mount \/dev\/sda1 \/tmp\/test 5. chroot \/dev\/test \/bin\/bash 6. Change: \/etc\/passwd: root:x:0:0:root:\/root:\/sbin\/nologin admin:x:591:503::\/home\/admin:\/usr\/local\/platform\/bin\/cliscript.sh to: root:x:0:0:root:\/root:\/bin\/bash admin:x:591:503::\/home\/admin:\/bin\/bash \/etc\/shadow root:!!:14657:0:99999:7::: to: root:$1$D2ISXWJF$urnCHPxcF20BUWWwvTZfX0:14657:0:99999:7::: \/etc\/sudoers add the Line for admin under the user privilege specification so that it looks like this: # User privilege\u2026","rel":"","context":"In &quot;Cisco&quot;","block_context":{"text":"Cisco","link":"https:\/\/www.nico-maas.de\/?cat=33"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":110,"url":"https:\/\/www.nico-maas.de\/?p=110","url_meta":{"origin":2173,"position":2},"title":"Eisfair Configuration","author":"Nico Maas","date":"16. July 2009","format":false,"excerpt":"Service List to Install \\ Configure: Inet Service: SSH Port Certs Service: - Apache2 Webserver: Web Port, Log Settings MySQL Server: Mysql Port, Log Settings, Network Enable, Cache Sizes Squid proxy: Cache off Minicom Service: - LPRng: - Samba: Create Users and Configure Shares and Network Dyndns: Configure DynDns Services\u2026","rel":"","context":"In &quot;Eisfair&quot;","block_context":{"text":"Eisfair","link":"https:\/\/www.nico-maas.de\/?cat=14"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":339,"url":"https:\/\/www.nico-maas.de\/?p=339","url_meta":{"origin":2173,"position":3},"title":"[pRoToTyPe] LaFonera OpenWRT\/Kismet\/GPS\/SD-Mod","author":"Nico Maas","date":"19. February 2010","format":false,"excerpt":"So, here is the Documentation of the Project that I have been working on the past Months. I called it \"Prototype\" for no other reason as not having another name ^^'. But actually its just an plain and simple Kismet Server running on an LaFonera 2100 and using GPS for\u2026","rel":"","context":"In &quot;Network&quot;","block_context":{"text":"Network","link":"https:\/\/www.nico-maas.de\/?cat=32"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/nico-maas.de\/wordpress\/wp-content\/uploads\/prototype-300x225.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":1702,"url":"https:\/\/www.nico-maas.de\/?p=1702","url_meta":{"origin":2173,"position":4},"title":"[Ubuntu] PERC6\/i on Ubuntu 16.04 LTS","author":"Nico Maas","date":"6. September 2017","format":false,"excerpt":"To use the PERC6\/i i.e. the 03:00.0 RAID bus controller: LSI Logic \/ Symbios Logic MegaRAID SAS 1078 (rev 04) on Ubuntu, megacli is the best tool - but rarely available due to the demise of LSI Logic. Good thing that the guys from\u00a0https:\/\/hwraid.le-vert.net\u00a0put together a nice repo to host\u2026","rel":"","context":"In &quot;Product Specific&quot;","block_context":{"text":"Product Specific","link":"https:\/\/www.nico-maas.de\/?cat=78"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1305,"url":"https:\/\/www.nico-maas.de\/?p=1305","url_meta":{"origin":2173,"position":5},"title":"[Ubuntu] Secure your Apache 2 Reverse Proxy","author":"Nico Maas","date":"12. September 2016","format":false,"excerpt":"We got an Apache 2, working as Reverse Proxy to some Docker instances (we won't talk about the nginx vs Apache stuff here for the same reasons we won't talk about vi vs emacs vs xyz ;)) - and somehow we realized that our apps are a little bit too\u2026","rel":"","context":"In &quot;Unix \\ Linux&quot;","block_context":{"text":"Unix \\ Linux","link":"https:\/\/www.nico-maas.de\/?cat=18"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=\/wp\/v2\/posts\/2173","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2173"}],"version-history":[{"count":1,"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=\/wp\/v2\/posts\/2173\/revisions"}],"predecessor-version":[{"id":2174,"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=\/wp\/v2\/posts\/2173\/revisions\/2174"}],"wp:attachment":[{"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2173"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2173"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nico-maas.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}