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Mostrando postagens de novembro, 2021

Tcpdump basics

novembro 29, 2021

This command is very useful for example in a linux firewall so you can monitor network packets, you can use at any linux machine too, here is a basic usage of it: # tcpdump -nli any 'host 192.168.1.3' tcpdump - is the command in question n - is not to convert IPs to names l - for the output to be organized in lines i - it is the interface that has been set to "any" here, that is, any interface but in place of any could be used such as "eth0" An important choice is whether you want to use logical operators like AND and OR # tcpdump -nli any 'host 192.168.1.3 and host 8.8.4.4' This way just above will show only the communication between IPs 192.168.1.3 and 8.8.4.4 # tcpdump -nli any 'host 192.168.1.3 or host 8.8.4.4' This last one just above will show any communicat...

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Tcpdump básico

novembro 29, 2021

Este comando é muito útil por exemplo em um firewall linux para que você possa monitorar os pacotes de rede, segue uma utilização básica dele:] # tcpdump -nli any 'host 192.168.1.3' tcpdump - é o comando em questão n - é para não converter os IPs para nomes l - para que a saída fique organizada em linhas i - é a interface que aqui foi setada como "any", ou seja, qualquer interface mas poderia ser utilizado qualquer interface como por exemplo "eth0" Uma opção importante é se você deseja utilizar operadores lógicos como o and e o or # tcpdump -nli any 'host 192.168.1.3 and host 8.8.4.4' Desta forma logo acima irá mostrar apenas a comunicação entre os IPs 192.168.1.3 E 8.8.4.4 # tcpdump -nli any 'host 192.168.1.3 or host 8.8.4.4' Nesta última logo acima irá mostrar qualquer comunicação que envolva os IPs 192.168.1.3 OU 8.8.4.4 mesmo que seja com algum outro IP ex: 192.168.1.6 V...

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Command to copy folders or migrate information "robocopy"

novembro 29, 2021

robocopy \\10.1.25.14\xml E:\Shares\XML /E /Z /ZB /R:5 /W:5 /TBD /NP /V /MT:16 /mir - if a information on source is removed since the first time now it removes on destination /E — Copy Subdirectories, including empty ones. /Z — Copy files in restartable mode. /ZB — Uses restartable mode. If access is denied, use backup mode. /R:5 — Retry 5 times (you can specify a different number, the default is 1 million). /W:5 — Wait 5 seconds before retrying (you can specify a different number, the default is 30 seconds). /TBD — Wait for share names To Be Defined (retry error 67). /NP — No Progress – don’t display percentage copied. /V — Produce verbose output, showing skipped files. /MT:16 — Do multithreaded copies with n threads (default is 8). Website: https://www.intelligencesoftware.com.br Ads: https://ads.intelligencesoftware.com.br

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Comando para copiar pastas ou migrar informações "robocopy"

novembro 29, 2021

robocopy \\10.1.25.14\xml E:\Shares\XML /mir /E /ZB /R:5 /W:5 /TBD /NP /V /MT:8 /mir - if a information on source is removed since the first time now it removes on destination /E — Copy Subdirectories, including empty ones. /Z — Copy files in restartable mode. /ZB — Uses restartable mode. If access is denied, use backup mode. /R:5 — Retry 5 times (you can specify a different number, the default is 1 million). /W:5 — Wait 5 seconds before retrying (you can specify a different number, the default is 30 seconds). /TBD — Wait for share names To Be Defined (retry error 67). /NP — No Progress – don’t display percentage copied. /V — Produce verbose output, showing skipped files. /MT:16 — Do multithreaded copies with n threads (default is 8). Website: https://www.intelligencesoftware.com.br Ads: https://ads.intelligencesoftware.com.br

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Understanding static routing

novembro 28, 2021

Understanding the routing process is essential for any professional who wants to work with networks so let's consider the initial scenario below. We are going to talk in this post about static routing, which is the basis for understanding dynamic routing, using protocols such as OSPF. In the figure above we have three computers "PC1, PC2 and PC3" and we also have three routers "R1, R2 and R3". We will need to define five networks as shown in the image below. Note that interfaces 1 and 2 of each of the routers are also identified. Now we can define the IPs according to the following information: PC1 - 192.168.0.10/24 R1 - Interface 1 - 192.168.0.1/24 PC2 - 192.168.1.10/24 R3 - Interface 2 - 192.168.1.1/24 PC3 - 192.168.2.10/24 R2 - Interface 3 - 192.168.2.1/24 Defined the networks where the PCs are, we are now going to define the link networks where IPs were saved and that is why the /30 mask was used. R1 - Interface 2 - 192.168.11...

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