Category: regular expressions

How to monitor for the “non existence” of an AS in the ASpath

Posted by Andree Toonk - October 25, 2008 - BGPmon.net, regular expressions
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How do I monitor the “non existence” of an AS in the ASpath Sometimes you have a prefix which is being announced from different AS’s and each of these have different upstream AS’s. Some of these are propagated all over the Internet and some of them are supposed to stay in a certain region or […]

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monitoring for multiple origin AS’s

Posted by Andree Toonk - October 20, 2008 - BGPmon.net, regular expressions
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The majority of the emails I receive with feedback and questions are things which can be solved with a regex. Today I would like to go over 1 common example: How do I monitor prefixes that originate from multiple origin AS’s Some people mailed me with a feature request for the ability to specify multiple […]

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Auto detect a regular expression for your prefixes

Posted by Andree Toonk - October 4, 2008 - BGPmon.net, regular expressions
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BGPmon offers different ways to monitor your prefixes. One of the tools is using a Regex for your ASpaths. Basically what it does is, compare every BGP update for your prefix with the ASpaths regex you submitted. If the Regex doesn’t match the ASpath in this particular update an alarm (code41) is generated.  ASregex are […]

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