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وب سایت شخصی مهندس رامین ملک قاسمی

مقالات شبکه و کامپیوتر

بايگاني براي اکتبر, 2017

Type in bgp left or right

Left : my internet provider advertise my prefix to internet public routes

 

right: my customer advertise prefix to me AS number and my as announce to left nighber

نوشته شده به وسيله ramin_malek در BGP ، دیدگاه‌ها برای Type in bgp left or right بسته هستند

AS path lenght

The average path length of the Internet autonomous system (AS) level topology was decreasing slightly in the last decade. Researches had shown that the average AS path length of the Internet was about 3.9 hops until 2012. However this inference was based on BGP routing tables collected from some vantage points that cannot cover the whole Internet. Researchers had also developed different methods to infer AS paths of the Internet, the easiest method considered the shortest paths as AS paths, but the reality is the ASes have self-defined routing policies which lead to a longer path than the shortest path. Other methods improved the inference accuracy. But they were also time consuming and difficult to be used in large scale. To explore the average AS path length of the Internet, we developed a new method to infer AS paths in a comparatively complete AS level topology. The core of this method was a path decision algorithm that simulated the packet transiting process for each AS in the Internet. The inference paths generated from this method were called as decision paths. The experimental results indicated that the decision paths were close to the actual AS paths especially for the path length distribution. At last, we discussed the effect of the incompleteness of peering links in the topology and inferred the average AS path length of the whole Internet using decision paths.
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How update Switch Cisco by tftp

Procedure for Upgrading Cisco Catalyst 2960 Switch IOS

نوشته شده به وسيله ramin_malek در Cisco ، دیدگاه‌ها برای How update Switch Cisco by tftp بسته هستند

Cronjob Command And job location

http://www.lifelinux.com/how-to-startstoprestart-cron-service-in-linux

 

Location Of cron Rules

 

/var/spool/cron

 

اسم فایل به اسم یوزی باشه که باهاش دسترسی دارید مثلا

 

root

 

Restart Cronjob service

service crond restart

 

نوشته شده به وسيله ramin_malek در Linux ، دیدگاه‌ها برای Cronjob Command And job location بسته هستند

Cronjob reboot example

Cronjob setup

https://www.digitalocean.com/community/tutorials/how-to-use-a-simple-bash-script-to-restart-server-programs

Reboot At midnight

https://serverfault.com/questions/155239/how-can-i-schedule-a-reboot-in-linux

 

https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=38607

See Crontab list 

crontab -l


Cron Tab example Site tools
https://crontab.guru/examples.html
نوشته شده به وسيله ramin_malek در Linux ، دیدگاه‌ها برای Cronjob reboot example بسته هستند

IPFIX example For PRTG

https://www.paessler.com/manuals/prtg/xflow_packet_sniffer_filter_rules#data_format

نوشته شده به وسيله ramin_malek در شبکه(mikRotik Routers) ، دیدگاه‌ها برای IPFIX example For PRTG بسته هستند

custom netflow sensor in prtg

https://kb.paessler.com/en/topic/2143-can-i-add-custom-channels-to-standard-packet-sniffer-and-netflow-sensors

 

Define Ip group

https://kb.paessler.com/en/topic/71974-monitor-traffic-exchange-with-certain-ip-ranges

نوشته شده به وسيله ramin_malek در شبکه(mikRotik Routers) ، دیدگاه‌ها برای custom netflow sensor in prtg بسته هستند

bgp command cisco equal mikroitk

Cisco to MikroTik – command translation – BGP

نوشته شده به وسيله ramin_malek در BGP ، دیدگاه‌ها برای bgp command cisco equal mikroitk بسته هستند

why ssh on freebsd low

https://lists.freebsd.org/pipermail/freebsd-questions/2005-July/092951.html

نوشته شده به وسيله ramin_malek در Freebsd ، دیدگاه‌ها برای why ssh on freebsd low بسته هستند

How Change Ip address in freebsd

http://www.freebsdmadeeasy.com/tutorials/freebsd/setting-up-the-network-in-freebsd.php

نوشته شده به وسيله ramin_malek در Freebsd ، دیدگاه‌ها برای How Change Ip address in freebsd بسته هستند

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