How to monitor LAN? Quickly collect, these six monitoring methods can effectively monitor the local area network!

LAN monitoring is not difficult, the key is to use the method smoothly and implement it well. The daily worries in business ——Strange devices come online quietly, bandwidth is used up by videos, and sensitive files are sent out without anyone knowing—all of them can actually be circumvented.

The following six tips, I personally think, are enough and hassle-free. From assets and traffic to terminals and logs, they cover all common pitfalls.

Practice 1: Previous Insight MIT system

screen view。Get a full view of employee computer screens “It’s clear at a glance who is, where, and what they are doing.，The working status of employees is under control, which can effectively prevent employees from being lazy during working hours.

Don’t just look at the total amount of traffic, but also its composition. Applications, protocols, sources and destinations can all be disassembled and graphical reports can be pulled up at any time. ； Once there is an abnormal spike (for example, a machine is full of uplinks in the middle of the night), the system will warn you in place, and the bandwidth can also be prioritized and limited. ——Don’t use non-work applications during working hours.

There must be traces of file operations. What was done to the file, sent You can trace it to whom it was given and when it was sent.； Permissions can be set for sensitive files, and key transmissions can be automatically backed up when necessary, so that they can be restored if something goes wrong.

Applying fine control makes you worry-free. Whitelist operation, blacklist prohibition, privately installed software will be intercepted if caught ； The running time statistics are compiled into a report. When you look back at the end of the month, it will be clear which ones are really useful and which ones are just taking up resources.

Remote maintenance reduces the need to run away. Remotely control the desktop, push software, transfer files, and issue instructions. Even if the equipment breaks down, you can help colleagues locate the problem from across the city. Many times, the problem is solved just by taking a sip of coffee.

Practice 2: Put terminal security management in place

Check the terminal status in full. System version, patch status, Antivirus software Whether online, disk space, hardening status ……Some risks are not "you will only know when something happens", but "the data just doesn't look right".

Don’t rely on reminders to fix bugs, you need to be able to force them. Baseline policies are issued in place, patches are applied, weak passwords are changed, redundant ports are closed, and actions are closed loop to leave fewer holes.

USB Interfaces need to be graded. Read-write, read-only, disabled, broken down by person and device ； The authorization fingerprint or serial number is bound, and the temporary release is time-limited. Personal testing can resist the urge to "copy a copy".

Process monitoring. Suspicious processes are identified, blocked, and terminated, and the start and stop times are recorded. One time, a design machine was slowed down by mining. The process was like a pair, and it took a few minutes to clean up.

Practice 3: Put together behavioral audits

The traces should be comprehensive but not over-the-top. Internet access, email exchanges, instant messaging, and file transfers should be organized according to the timeline, and the query dimensions should be as large as possible, so that subsequent locating problems can be saved.

Analysis is more important than heaps of data. Proportion of non-work activities, access peaks, and distribution of common applications are compiled into reports ； Fine-tuning management strategies relies on data. It is normal for the takeaway website to have a small peak before lunch, but the exception is sudden large traffic downloads at night.

Violations must be immediately alerted and evidence collected. Sensitive keywords, external risk sites, external sharing links and other triggering rules will be notified immediately ； Keep the chain of evidence and dispose of it as you wish.

Compliance retention has a cycle. Industries such as finance and legal affairs have requirements for retention time and retrieval capabilities. Backup and encrypted storage must be done in accordance with standards, so you don't panic when audits come.

Practice 4: Keep an eye on wireless access points

Identify first, then control. Scan the entire network for wireless signals, legal  AP File, private“ rogue AP ”Locate offline in a timely manner and do not leave a backdoor for external devices.

Wireless performance should be viewed dynamically. Signal strength, number of associated terminals, bandwidth usage, congestion will guide the device to roam to a more free location.  AP ； As soon as a large meeting begins, dozens of mobile phones rush in. This step can save lives.

Don’t make do with security protocols. unified  WPA2/WPA3 , turn off outdated encryption methods； Password complexity and enterprise-level authentication are configured well, and the guest network and office network are clearly separated.

Practice 5: Do vulnerability scanning and authorization penetration testing

The scan is comprehensive: servers, switches, terminals, key business systems, system vulnerabilities, configuration errors, weak passwords, and open ports are all checked, and risk classification and repair suggestions are issued at the same time.

Penetration testing is limited to authorized scope and within controllable windows. Simulate common attack surfaces (such as authentication weaknesses, common injections, privilege escalation, etc.) to verify the effectiveness of defenses. The purpose is to discover gaps that can be exploited, not “Show off your skills." Generally, choose a maintenance window during low business peak hours or weekends, which will have less impact.

If problems are discovered, follow up and close the loop. Repair, retest, and optimize strategies to form a rhythm ——Full volume once a quarter and key points once a month to stabilize the safety baseline in the long term.

Method 6: Centralize log management

First unify collection and classification. Routers, switches, firewalls, servers, terminals, run /operate/Security logs are collected in a unified manner and the format is flat for easy retrieval and association.

Search quickly. Multi-dimensional filtering by device, time, user, log level, and keywords to locate key segments in seconds ； When something goes wrong, you can go a lot faster by avoiding backtracking.

Be smart about anomaly recognition. rule +Together with the model, events such as abnormal logins, blast interceptions, and traffic surges are automatically marked and pushed, early in the morning 3:17 Strange login, don’t wait until work to see it.

Retrospective evidence collection is reliable. The logs are kept periodically and verified. When a security incident occurs, the trace can be restored, who did what and when, and the evidence chain is complete.

Editor: Reiko