FAQ

Install / Update / Upgrade

Why won’t the ISO image boot on my machine?

Please see the Booting Issues section.

What if I receive a The IP being routed by Linux is not the IP address assigned to the management interface error message?

Please see the warning about this in the Configuration section.

What languages are supported?

We only support the English language at this time.

How do I install Security Onion updates?

Please see the soup section.

What connectivity does Security Onion need to stay up to date?

Please see the Firewall section.

What do I need to do if I’m behind a proxy?

Please see the Proxy section.

Can I run Security Onion on Raspberry Pi or some other non-x86 box?

No, we only support x86-64 (standard Intel/AMD 64-bit architectures). Please see the Hardware Requirements section.

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Users / Passwords

What is the password?

Please see the Passwords section.

How do I add a new user account?

Please see the Adding Accounts section.

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Support / Help

Where do I send questions/problems/suggestions?

Please see the Community Support section.

Is commercial support available for Security Onion?

Yes, we offer commercial support at https://securityonionsolutions.com.

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IDS engines

Can Security Onion run in IPS mode?

No, Security Onion does not support blocking traffic. Most organizations have some sort of Next Generation Firewall (NGFW) with IPS features and that is the proper place for blocking to occur. Security Onion is designed to monitor the traffic that makes it through your firewall.

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Security Onion internals

Where can I read more about the tools contained within Security Onion?

Please see the Tools section.

What’s the directory structure of /nsm?

Please see the Directory Structure section.

Why does Security Onion use UTC?

Please see the UTC and Time Zones section.

Why are the timestamps in Kibana not in UTC?

Please see the UTC and Time Zones section.

Why is my disk filling up?

In general, Security Onion attempts to make use of as much disk space as you give it. Depending on installation type, it should continue writing data to disk until disk usage reaches 80-90% at which point it should begin purging old data. Most disk space is used by Elasticsearch or full packet capture written to disk via Stenographer or Suricata.

How is my data kept secure?

Standard network connections to or from Security Onion are encrypted. This includes SSH, HTTPS, Elasticsearch network queries, and Salt minion traffic. Endpoint agent traffic is encrypted where supported. This includes the Elastic Agent which supports encryption with additional configuration. SOC user account passwords are hashed via bcrypt in Kratos and you can read more about that at https://github.com/ory/kratos.

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Tuning

How do I configure email for alerting and reporting?

Please see the Email section.

How do I configure a BPF?

Please see the BPF section.

How do I filter traffic?

Please see the BPF section.

How do I exclude traffic?

Please see the BPF section.

What are the default firewall settings and how do I change them?

Please see the Firewall section.

What do I need to modify in order to have the log files stored on a different mount point?

Please see the Adding a new disk section.

Miscellaneous

Where can I find interesting pcaps to replay?

Please see the PCAPs for Testing section.

Why is Security Onion connecting to an IP address on the Internet over port 123?

Please see the NTP section.

Should I backup my Security Onion box?

Security Onion automatically backs up some important configuration as described in the Backup section. However, there is no automated data backup. Network Security Monitoring as a whole is considered “best effort”. It is not a “mission critical” resource like a file server or web server. Since we’re dealing with “big data” (potentially terabytes of full packet capture) of a transient nature, backing up the data would be prohibitively expensive. Most organizations don’t do any data backups and instead just rebuild boxes when necessary.

How can I add local rules?

Please see the Detections section.

Can I connect Security Onion to Active Directory or LDAP?

We understand the appeal of integrating with directory services like Active Directory and LDAP, but we typically recommend against joining any security infrastructure (including Security Onion) to directory services. The reason is that when you get an adversary inside your network, one of their first goals is going to be gaining access to that directory. If they get access to the directory, then they get access to everything connected to the directory. For that reason, we recommend that all security infrastructure (including Security Onion) be totally separate from directory services.

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