2021-02-23 14:39:58 +01:00
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# Legal Interception (LI)
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The BNG Blaster can be used to emulate a mediation device providing detailed statistics
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about the received flows. Today only the BCM QMX LI header format is supported but further
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headers can be easily integrated.
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*BCM QMX LI Header Format*
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```
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| D | PT | SPT | LIID |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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```
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The functionality is automatically enabled on the network interface
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and works combined with sessions in one instance or as standalone
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mediation device as shown in the following example.
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```json
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{
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"interfaces": {
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"tx-interval": 10,
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"rx-interval": 1,
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"network": {
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"interface": "eth2",
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"address": "100.0.0.10",
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"gateway": "100.0.0.2"
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}
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}
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}
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2021-02-26 18:40:55 +01:00
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```
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2021-02-23 14:39:58 +01:00
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The received flows can be queried using the control socket.
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`$ sudo ./cli.py run.sock li-flows`
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```json
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{
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"status": "ok",
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"code": 200,
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"li-flows": [
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{
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"source-address": "1.1.1.1",
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"source-port": 49152,
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"destination-address": "1.1.1.2",
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"destination-port": 49152,
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"direction": "downstream",
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"packet-type": "ethernet",
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"sub-packet-type": "double-tagged",
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"liid": 4194301,
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"bytes-rx": 94,
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"packets-rx": 1,
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"packets-rx-ipv4": 0,
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"packets-rx-ipv4-tcp": 0,
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"packets-rx-ipv4-udp": 0,
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2021-03-10 17:04:56 +01:00
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"packets-rx-ipv4-host-internal": 0,
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"packets-rx-ipv6": 0,
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"packets-rx-ipv6-tcp": 0,
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"packets-rx-ipv6-udp": 0,
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"packets-rx-ipv6-host-internal": 0,
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"packets-rx-ipv6-no-next-header": 0
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2021-02-23 14:39:58 +01:00
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},
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{
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"source-address": "1.1.1.1",
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"source-port": 49152,
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"destination-address": "1.1.1.2",
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"destination-port": 49152,
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"direction": "upstream",
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"packet-type": "ethernet",
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"sub-packet-type": "double-tagged",
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"liid": 4194301,
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"bytes-rx": 160720,
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"packets-rx": 820,
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"packets-rx-ipv4": 820,
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"packets-rx-ipv4-tcp": 0,
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"packets-rx-ipv4-udp": 0,
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2021-03-10 17:04:56 +01:00
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"packets-rx-ipv4-host-internal": 820,
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"packets-rx-ipv6": 0,
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"packets-rx-ipv6-tcp": 0,
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"packets-rx-ipv6-udp": 0,
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"packets-rx-ipv6-host-internal": 0,
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"packets-rx-ipv6-no-next-header": 0
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2021-02-23 14:39:58 +01:00
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}
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]
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}
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```
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The `packets-rx-ipv4-host-internal` refers to the IPv4 protocol number 61 (any host internal protocol)
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2021-03-10 17:04:56 +01:00
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which is used by some network testers as default type for traffic streams.
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The same is valid for `packets-rx-ipv6-host-internal` which refers to next header 61 and
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`packets-rx-ipv6-no-next-header` with next header 59.
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