Infrastructure Layer
Latency Attack
The Latency Gremlin injects latency into IP packets at the transport layer, targeted by supplied port and host arguments.
Linux
The Latency Gremlin uses existing Quality of Service (QOS) and Differentiated Services (diffserv) facilities in the Linux kernel to emulate packet latency.
This Gremlin does not interact with iptables, and so it does not interfere with any existing iptables rulesets.
This Gremlin requires the NET_ADMIN capability, which is enabled for Gremlin by default at installation time. See capabilities(7)
Windows
The Latency Gremlin uses a custom driver to emulate packet latency.
This Gremlin was introduced with Windows agent 1.0.11.
Options
| Parameter | Flag | Required | Default | Version | Description |
|---|---|---|---|---|---|
| IP Addresses | -i IP address | False | 0.0.1 | Only impact traffic to these IP addresses. Also accepts CIDR values (i.e. 10.0.0.0/24). | |
| Device | -d interface | False | Device discovery | 0.0.1 | Impact traffic over this network interface. |
| Hostnames | -h hostnames | False | ^api.gremlin.com | 0.0.1 | Only impact traffic to these hostnames. |
| Egress Ports | -p port numbers | False | ^53 | 0.0.1 | Only impact egress traffic to these destination ports. Also accepts port ranges (e.g. 8080-8085). |
| Source Ports | -s port numbers | False | 0.0.1 | Only impact egress traffic from these source ports. Also accepts port ranges (e.g. 8080-8085). | |
| MS | -m int | False | 100 | 0.0.1 | How long to delay egress packets (millis). |
| Protocol | -P {TCP, UDP, ICMP} | False | all | 1.5.3 | Only impact a specific protocol. |
| Providers | WebUI and API Only | False | 0.0.1 | External service providers to affect. | |
| Tags | WebUI and API Only | False | 0.0.1 | Only impact traffic to hosts running Gremlin clients associated with these tags. | |
| Length | -l int | False | 60 | 0.0.1 | The length of the attack (seconds). |