When a service response is restored from at least one server, the alarm condition is cleared. Alarms are raised and cleared on the Alcatel-Lucent Fault Manager or other third party fault management servers.
The servers are accessed in order from lowest to highest specified index from 1 to 5 for authentication requests until a response from a server is received. A higher indexed server is only queried if no response is received from a lower indexed server.
If a response from the server is received, no other server is queried. One of two scenarios can occur. The process continues until the request is either accepted, denied, or each server is queried. This is the last chance for the access request to be accepted. It is up to the vendor to specify the format of their VSA. The attribute-specific field is dependent on the vendor's definition of that attribute. The following example displays a user-specific VSA configuration.
This configuration shows attributes for users named ruser1 and ruser2. The following example shows that user ruser1 is granted console access. The default action permits all packets when matching conditions are not met.
The timetra-cmd parameters allow the user to use the tools;telnet;configure system security commands. Matching strings specified in the timetra-action command are denied for this user.
The user ruser2 is granted FTP access. The default action denies all packets when matching conditions are not met. The timetra-cmd parameters allow the user to use the configure, show, and debug commands. Matching strings specified in the timetra-action command are permitted for this user. A connection is always initiated by the client the user. With authentication and encryption, SSH allows for a secure connection over an insecure network.
Rather than validating identities via passwords, SSH2 can also use public key encryption to authenticate remote hosts. For example, if you were to connect to a remote host also running SSH2, the secure shell would use this system to verify that the remote system is the host and not a computer set up to imitate it. SSH supports remote login to another computer over a network, remote command execution, and file relocation from one host to another.
Inbound SSH sessions are counted as inbound Telnet sessions for the purposes of the maximum number of inbound sessions specified by Login Control. The key is only valid until either the node is restarted or the SSH server is stopped and restarted. The key size is non-configurable and set at bits.
When the server is enabled, both inbound SSH and SCP sessions will be accepted provided the session is properly authenticated. Similarly, the SAR SCP client application can use either slash or backslash characters, but not all SCP clients treat backslash characters as equivalent to slash characters.
CSM filters are used to protect the control plane from DoS attacks, unauthorized access to the node, and similar security breaches.
IP filters scan all traffic and take the appropriate configured action against matching packets. IPv4 CSM filters drop or accept incoming packets based on the following match criteria:. IPv6 CSM filters drop or accept incoming packets based on the following match criteria:.
To avoid DoS-like attacks overwhelming the control plane while ensuring that critical control traffic such as signaling is always serviced in a timely manner, the SAR has three queues High, Low, and Ftp for handling packets addressed to the CSM:. These queues are fixed use each queue handles a certain type of traffic, which is not user-configurable and fixed configuration each queue is configured for particular rates and buffering capacity and is not user-configurable.
The SAR increases the delay between login attempts exponentially to mitigate attacks. It is applied to the console login. SSH and Telnet sessions terminate after four attempts. Security In This Chapter This chapter provides information to configure security parameters. Topics in this chapter include: Authentication, Authorization, and Accounting. Configuring Security with CLI.
Security Command Reference. Authentication, Authorization, and Accounting This chapter describes authentication, authorization, and accounting AAA used to monitor and control network access on the SAR.
Authentication Authentication validates a user name and password combination when a user attempts to log in. Visual Notification Assistant The Alcatel-Lucent Visual Notification Assistant provides a simple and flexible, easy-to install, intuitive notification system.
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