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Router and Switch Security Policy
Routers and smart switches provide important security functions within a network. Configured correctly, they are one of several hardware and software devices available that help manage and protect a private network from a public one. The Router and Switch Security Policy defines configuration requirements to meet security standards, change management requirements, and operational requirements.
This document designed to protect the equipment and data of the (organization) and its business partners or any data the (organization) is in custody of by defining the minimum configuration standards for all routers and switches connecting to the organizational network.
All employees, contractors, consultants, temporary and other workers who use network devices such as Router and/or switch must adhere to this policy. All routers and switches connected to networks are affected.
Every router/switch must meet the following configuration standards:
- No local user accounts are configured on the router or switch. Routers and switches must use a dedicated AAA server (e.g. TACACS+) for all user authentication.
- The enable secret must be used instead of enable password.
- The enable secret on the router or switch must be kept in a secure encrypted form.
- The following services or features must be disabled:
- IP directed broadcasts (Enable IP directed broadcast when you want to perform remote management or administration services such as backups on hosts in a subnet that does not have a direct connection to the Internet).
- Incoming packets at the router/switch sourced with invalid addresses such as RFC1918 addresses.
- TCP small services
- UDP small services
- All web services running on router
- Layer 2 device discovery protocol (e.g. CDP and LLDP) and other discovery protocols.
5. Routers and switches and/or interfaces should disallow the following:
- ICMP unreachable messages.
- Fast switching and autonomous switching.
- Multicast route caching.
- Maintenance Operation Protocol (MOP).
6. The following services must be configured:
- Time syncing (NTP). All network clocks should be synced to a common time source.
7. All routing updates shall be done using secure routing updates.
8. Use (organization) standardized SNMP community strings. Default strings, such as public or private must be removed. SNMP must be configured to use the most secure version of the protocol allowed for by the combination of the device and management systems.
9. Access control lists must be used to limit the source and type of traffic that can terminate on the device itself.
10. Each router must have a Login banners that useful to inform potential users that use of the login is only for authorized users. the following statement presented for all forms of login whether remote or local:
“UNAUTHORIZED ACCESS TO THIS NETWORK DEVICE IS PROHIBITED.
You must have explicit permission to access or configure this device. All activities performed on this device may be logged, and violations of this policy may result in disciplinary action in accordance with regulation in force. There is no right to privacy on this device. Use of this system shall constitute consent to monitoring.”
11. Telnet may never be used across any network to manage a router, unless there is a secure tunnel protecting the entire communication path. SSH version 2 is the preferred management protocol.
12. Routers and switches should be placed in a location where physical access is limited to authorized persons only.
13. The switch should disable a port or group of ports if new or unregistered MAC addresses appear on a port if the feature is available.
14. The switch should generate an SNMP trap if the link drops and is re-established if the feature is available
15. Dynamic routing protocols must use authentication in routing updates sent to neighbors. (Password hashing for the authentication string must be enabled when supported).
16. The (organization) router configuration standard will define the category of sensitive routing and switching devices, and require additional services or configuration on sensitive devices including:
- IP access list accounting
- Device logging
- Incoming packets at the router sourced with invalid addresses, such as RFC1918 addresses, or those that could be used to spoof network traffic shall be dropped.
17. Network configurations and changes must be documented regularly to understand its structure. Network documentation should include:
- Network diagram
- System configurations
- Firewall rule set
- IP Addresses
- Access Control Lists