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Ring Buffer Configuration Guide: Difference between revisions
Ring Buffer Configuration Guide (view source)
Revision as of 12:08, 14 September 2023
, 14 September 2023→Single shared ring buffer: Typo fixes
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== '''Single shared ring buffer''' == | == '''Single shared ring buffer''' == | ||
The single shared ring buffer the default setup on all Allegro Network Multimeters that are shipped with '''one''' internal or external storage device. This is designed for using '''ONE''' internal, external or iSCSI storage device. ( Please see the section [[#iSCSI ring buffer]] for more information ). You can check at '''Generic''' → '''Storage''' if the Allegro Network Multimeter has detected a storage device. Here an example of ONE attached disk: | The single shared ring buffer is the default setup on all Allegro Network Multimeters that are shipped with '''one''' internal or external storage device. This is designed for using '''ONE''' internal, external or iSCSI storage device. ( Please see the section [[#iSCSI ring buffer]] for more information ). You can check at '''Generic''' → '''Storage''' if the Allegro Network Multimeter has detected a storage device. Here an example of ONE attached disk: | ||
[[File:Storage no device active.png|border|600px]] | [[File:Storage no device active.png|border|600px]] | ||
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Here you can decide whether disk encryption will be used or not, see [[#Encryption]] below. You can also decide if and how much space can be used for the '''packet ring buffer'''. Please note that you cannot save any pcap files to the external disk when you use '''100 %''' for the '''ring buffer'''. | Here you can decide whether disk encryption will be used or not, see [[#Encryption]] below. You can also decide if and how much space can be used for the '''packet ring buffer'''. Please note that you cannot save any pcap files to the external disk when you use '''100 %''' for the '''ring buffer'''. | ||
If the disk has been formatted, you can continue with the configuration of the '''ring buffer''' at '''Generic''' → '''ring buffer'''. If you have created a disk with a ring buffer, you should see the statistics of the buffer as in the | If the disk has been formatted, you can continue with the configuration of the '''ring buffer''' at '''Generic''' → '''ring buffer'''. If you have created a disk with a ring buffer, you should see the statistics of the buffer as in the screenshot here below. | ||
[[File:Running packet ring buffer.png|border|600px]] | [[File:Running packet ring buffer.png|border|600px]] | ||
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== Filter Rules == | == Filter Rules == | ||
Both ring buffer modes support packet filtering mechanisms. Most situations require that only a subset of all packets are stored to the disk. Each ring buffer can be configured by a separate list of rules. All | Both ring buffer modes support packet filtering mechanisms. Most situations require that only a subset of all packets are stored to the disk. Each ring buffer can be configured by a separate list of rules. All packets that do not match a condition are captured. The first matching condition is applied to the packets. | ||
=== Filter rule conditions === | === Filter rule conditions === | ||
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=== Buffering traffic peaks or disk slowdowns === | === Buffering traffic peaks or disk slowdowns === | ||
Note that most HDDs and SSDs do not have a guaranteed write rate. Especially HDDs via the USB or SATA3 protocol can have downtimes of hundreds of milliseconds between writes. Each ring buffer uses a certain amount of memory to buffer traffic peaks. This buffer can be configured at the '''Settings''' of the '''ring buffer''' | Note that most HDDs and SSDs do not have a guaranteed write rate. Especially HDDs via the USB or SATA3 protocol can have downtimes of hundreds of milliseconds between writes. Each ring buffer uses a certain amount of memory to buffer traffic peaks. This buffer can be configured at the '''Settings''' of the '''ring buffer'''. | ||
[[File:Ring buffer queue resize config.png|border|800px]] | [[File:Ring buffer queue resize config.png|border|800px]] | ||
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Since firmware version 3.4 it is possible to use a randomly generated password for the encrypted storage device. When used, the storage can be activated and deactivated without entering the password. Also, the storage device is automatically activated on system start/restart. | Since firmware version 3.4 it is possible to use a randomly generated password for the encrypted storage device. When used, the storage can be activated and deactivated without entering the password. Also, the storage device is automatically activated on system start/restart. | ||
The password is stored encrypted on the device and cannot be moved a different device. The password is also deleted on a configuration reset of the Allegro Network Multimeter. | The password is stored encrypted on the device and cannot be moved to a different device. The password is also deleted on a configuration reset of the Allegro Network Multimeter. | ||
Since the password is stored on the Allegro Network Multimeter, the storage device cannot be used on a different Allegro Network Multimeter without reformatting. | Since the password is stored on the Allegro Network Multimeter, the storage device cannot be used on a different Allegro Network Multimeter without reformatting. | ||
When the key is removed (on configuration reset or reformat), it cannot be restored! | When the key is removed (on configuration reset or reformat), it cannot be restored! | ||