Network

Cisco ASA Firewall

Cisco ASA adaptive security appliance syslog — TCP/UDP/ICMP connection lifecycle, ACL permit/deny decisions, NAT translations, VPN tunnel events, and failover status messages.

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Quick Start

uv tool install eventum-generator
git clone https://github.com/eventum-generator/content-packs.git
cd content-packs
eventum generate \
  --path generators/network-cisco-asa/generator.yml \
  --id asa \
  --live-mode true

Event Types

Event ID	Description	Frequency	Category
302013	TCP Built	~25%	connection
302014	TCP Teardown	~24%	connection
302015	UDP Built	~8%	connection
302016	UDP Teardown	~8%	connection
302020	ICMP Built	~2%	connection
302021	ICMP Teardown	~2%	connection
106100	ACL Hit	~13%	firewall
106023	ACL Deny	~7%	firewall
305011	NAT Built	~3%	nat
305012	NAT Teardown	~3%	nat
113xxx	Authentication	~3%	auth
722xxx	VPN	~3%	vpn
725xxx	SSL	~2%	ssl
199xxx	System	~1%	system

Realism Features

Correlated connection pairs — built events push to shared state; teardown events consume with matching connection IDs
NAT correlation — NAT built/teardown events use shared state for consistent address mapping
VPN session tracking — connect events store sessions consumed by disconnect events
ASA-specific message format — event.original contains the full syslog line matching real ASA output
TCP teardown reasons — weighted distribution of FINs (50%), Reset-I (15%), Reset-O (10%), Idle Timeout (20%)

Sample Output

{
    "@timestamp": "2026-02-21T14:30:15.000000+00:00",
    "cisco": {
        "asa": {
            "connection_id": "100042",
            "destination_interface": "outside",
            "message_id": "302013",
            "source_interface": "inside"
        }
    },
    "event": {
        "action": "flow-creation",
        "category": ["network"],
        "code": "302013",
        "original": "%ASA-6-302013: Built outbound TCP connection 100042 for inside:10.1.1.30/52847 to outside:93.184.216.34/443",
        "outcome": "success"
    },
    "network": {
        "direction": "outbound",
        "transport": "tcp"
    },
    "observer": {
        "hostname": "ASA-FW-01",
        "product": "asa",
        "type": "firewall",
        "vendor": "Cisco"
    }
}

Parameters

Parameter	Default	Description
hostname	ASA-FW-01	ASA device hostname
domain	example.com	Domain name
nat_ip	198.51.100.1	Public NAT IP for outbound connections
agent_id	a3b7e2c1-...	Elastic Agent ID
agent_version	8.17.0	Elastic Agent version

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