GCP Top Traffic Monitor (10367 / 20367)

Description

This Module identifies GCP VM instances with the most traffic. It consolidates VPC Flow Logs records over a period of time (Data Collection Interval) which all have the same combination of the following fields:
    Source IP address
    Destination IP address
    Source port number
    Destination port number
    Layer 3 protocol
    Reporter
This information is provided per Subnetwork. The Module also enriches them with GCP data not reported in base VPC Flow Logs (when metadata fields are disabled).
De-duplication: optionally the Module can report consolidated flows only from authoritative Subnetwork. Authoritative Subnetwork is determined as follows. The Module sums up bytes, packets, and connections between two GCP VM instances over data collection interval reported by each Subnetwork. A Subnetwork with most connections (flows) for each consolidated flow is considered authoritative, and flows reported for the same two GCP VM instances by all other Subnetworks are discarded.

Parameters

Parameter Name
Description
Comments
Data Reporting Interval, sec
Module logic execution interval
min = 5 sec, max = 1800 sec, default = 30 sec
N – number of reported hosts
The number of top hosts reported per NetFlow exporter
min = 0, max = 100000, default = 50 (0 indicates all hosts are reported)
Share of total traffic reported, %
Reported percent of total traffic per VPC
e.g. 98 - indicates that reported consolidated flows consuming 98% of total NetFlow exporter traffic; min = 1%, max = 100%, default = 95%
Not more than N consolidated flows will be reported
Enable(1) or disable (0) reporting by authoritative exporters only
If set to 1 (de-duplication enabled), the Module reports flows only from authoritative VPCs (exporters)
default = 0
Compute Engine VM Instances
VMs with IPs, project ID, zone, name, and VPC names
Provided by EDF agent
Compute Engine IPv4 Routes
IP range, source and destination subnetwork IDs, Subnetwork name
Provided by EDF agent

Input

GCP Flow Logs

Syslog/JSON Message Fields

Key
Field Description
Comments
nfc_id
Message type identifier
“nfc_id=20367”
exp_ip
NetFlow exporter Ipv4 address
<IPv4 address> (added for compatibility with other flows)
reporter
GCP VPC Flow logs Reporter
<string>, "SRC" or "DEST"
gcp_exp
GCP VPC Flow logs Exporter. Calculated field based on reporter = SRC or DEST
<string>, "Project ID/VPC/Subnet"
protocol
Transport Protocol ( TCP = 6, UDP = 17)
<number>
src_ip
Source host IPv4 address
<IPv4 address>
[src_ip6]
Source host Ipv6 address
<IPv6 address>
[src_host]
Source host name
<string>, included when FQDN is on
[src_project_id]
Source Project ID
<string>
[src_vm_name]
Source VM name
<string>
[src_vm_zone]
Source VM Zone
<string>
[src_vpc_name]
Source VPC Name
<string>
src_port
Source port number
<number>
dest_ip
Destination host IPv4 address
<IPv4 address>
[dest_ip6]
Destination host IPv6 address
<IPv6 address>
[dest_host]
Destination host name
<string>, included when FQDN is on
[dest_project_id]
Destination Project ID
<string>
[dest_vm_name]
Destination VM name
<string>
[dest_vm_zone]
Destination VM Zone
<string>
[dest_vpc_name]
Destination VPC Name
<string>
dest_port
Destination EC2 instance port number
<number>
tcp_flag
TCP Flags
<string>, e.g. “SYN,ACK,FIN”
packets_in
Packets in the flow
<number>
bytes_in
Total number of Layer 3 bytes in the packets of the flow received
<number>
flow_count
Number of consolidated Flows
<number>
percent_of_total
Percent of Total (bytes)
<decimal>, e.g. 25.444% is 25.444
subnet_id
Subnet ID
<string>
flow_start_time
Start time of the first consolidated flow
<time>
flow_end_time
End of the last consolidated flow
<time>
t_int
Observation time interval, msec
<number>
Last modified 2mo ago