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| - | ==== Using DPI as pre-filter for СОРМ ==== | ||
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| - | The additional СОРМ licenses purchase is needed eventually to serve increasing number of subscribers and increase of speed in billing plans.\\ | ||
| - | SKAT allows reduction of traffic that is mirrored to СОРМ. This is achieved by filtering of components that СОРМ does not analyse. For example: p2p (torrent), video traffic and so on. The expected traffic reduction is from 40% to 70%, depending on the traffic' | ||
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| - | Pre-filter license purchase peculiarities: | ||
| - | * The BASE license is sufficient to filter the traffic. | ||
| - | * In case of using SKAT to filter the traffic between 10 Gb/s and 20 Gb/s (the traffic is received by 2 SPAN ports with subsequent merge and transfer to the third port for СОРМ) you need the license SKAT-40 BASE. However it is charged as SKAT-20 BASE license. The usage of SKAT-40 Base license is limited to the filter in this case. | ||
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| - | The usage diagram:\\ | ||
| - | {{sorm_schema1_en.png? | ||
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| - | Configuration example to filter the torrent traffic. The traffic is between 10 Gb/s and 20 Gb/s: | ||
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| - | First we create the file protocols.dscp: | ||
| - | < | ||
| - | echo " | ||
| - | cat protocols.txt|lst2dscp / | ||
| - | </ | ||
| - | |||
| - | Change configuration in the file / | ||
| - | < | ||
| - | in_dev=dna0: | ||
| - | out_dev=dna2: | ||
| - | only_tcp=0 | ||
| - | mem_preset=1 | ||
| - | </ | ||
| - | |||
| - | Check filtering results: | ||
| - | |||
| - | Execute | ||
| - | < | ||
| - | |||
| - | In statistics lines | ||
| - | < | ||
| - | IF dna1 : | ||
| - | ... | ||
| - | Drop: [8054507798 bytes][68.92 %] | ||
| - | | ||
| - | ... | ||
| - | </ | ||
| - | we find the percentage and volume of filtered traffic. | ||