When network access certification system is online, the most common traffic team is not that it's not functional, but rather a variety of things."- I'm not sure.": Some end-certification failed, some were not online, others had a sudden failure of unconsciousness and Radius was overtime. These failures could easily be carried away by surfaces and wasted time. This sort of search idea that would help the transport team to look at common malfunctions when access systems are online.
Pre-secalogue: authentication, authorization, access to three levels separately
The first step is to determine which level of access failure is the problem. Access links are three levels: authentication (identity and proof verification), authorization (strategy and clearance), access (network equipment execution release)."The certification failed."Or..."Authentication passed but not released"Or..."It's free, but access is limited."The way to judge is simple: see if the terminal can complete authentication, see what VLAN and IP are made after certification, see whether it can access the target resources. Positioning the problem on a specific level makes the path clear and avoids repeating errors in the wrong direction.
Common root causes for authentication failure
The failure of authentication is a maximum frequency access failure, often rooted in several categories: account number problems (account numbers are disabled, password errors, account numbers are not authorized), certificate issues (certificate expirys, certificate chain incomplete), terminal time problems (end local time and authentication server deviations and certification requests have been found invalid), protocol problems (equipment does not support the current authentication agreement) and Radius configuration problems (sharing key inconsistencies, port impassable). When checking, priority is given to the authentication server log, confirming whether the authentication request has arrived, returned what results, then checking account numbers, certificates, times and configurations on a case-by-case basis.
Authentication check-ups that pass but cannot be accessed
"The certification went through, but it didn't go online."Another common problem, usually at the level of authorization or access. The path to check includes whether VLAN is correct after certification and the IPs obtained by the end are legal; whether the ACL strategy limits access targets; whether network equipment has correctly implemented access decisions; whether there are port or link problems."Access."You can't visit a specific resource without a strategy of authorization."I can't get on the net."Actually,"You can't access the Internet, but you can't access some targets."The problem is often quickly solved.
NATHHELL_SEAMLESS_AUTH Exact Check
NATSHEL_SEAMLESS_AUTH — which was to be exempted from login but repeatedly requested authentication) is also a high frequency problem. Common root causes: changes in the terminal ' s MAC address (e.g. mobile phone random MAC open), replacement of a network card or device, loss of system ' s binding records, lack of awareness strategy and misdisposed MAC learning problems on the switchboard/AP side. Check whether the terminal has been enabled by random MACs, then see if the equipment binding records in the system are still available, and finally check whether an unconscious strategy covers the access area.
Radius time-out and access storm processing
Radius timeout and access storm are usually associated. When authentication server pressure is too high or network links are abnormal, a large number of terminal certification requests are tested over time and form"Access to storm"And it's just that you can't get a lot of information from the government."Stop the bleeding and cure the whole thing.": Check the certified server load and chain state, and expand or restart services as necessary; check whether there are a large number of unusual terminal tests to identify the causes of storms (e.g., if a device is madly initiating certification). Daily capacity planning and monitoring of authentication servers should be performed to avoid peak-triggering surges.
The core of the network access certification system is a failure check."Tier-based location, then item-by-item check, log-back recovery"The authentication level looks at the account certificate and time, authorizes VLAN and ACL to look at network equipment implementation, and coordinates with the certification logs and web equipment logs. Most access failures are quickly located. The line-up is clear so that the crew does not have to work on access problems but rather resolve them in a way that is structured.