Logs of the traffic flowing through the router aren’t the only logs you should be monitoring. Whenever your connection isn’t correctly routed, you should see the reason in the router logs.
Some routers have more default security mechanisms built in than others. Connection rejected: We covered a few examples above, but there are many other reasons connections can be rejected.Again, your best bet is to analyze logs to see if there’s a message indicating the ARP protection mechanism has been triggered Sometimes, those mechanisms also block legitimate requests. Some routers implement various mechanisms to prevent this form of attack. Unfortunately, because ARP allows a spontaneous reply, ARP spoofing attacks exist. ARP protection: The address resolution protocol (ARP), which is responsible for mapping hardware addresses to IP addresses, is crucial for any network to work properly.If a router blocks ICMP traffic, a ping command will fail, which may mislead you in to thinking the system you’re trying to test isn’t available. But it’s also a common practice to use a ping tool to check the connections. For example, a common security practice is to block ICMP traffic. Protocol-based filtering/rules: Many routers also filter traffic or apply special rules to it based on the traffic’s protocol.Looking at the router logs, however, can help you see if a particular computer was blocked because its IP address isn’t listed in the router’s allow list. Unfortunately, spotting this on an affected computer can be difficult (because there can be many reasons for a connection not working). For example, maybe you forgot to add a new IP address to the list. Allow/deny lists: Allow/deny lists are popular, firewall-like mechanisms built in on most routers that allow you to simply allow or deny traffic based on the source or destination of the packet.In most cases, you’ll find a simple configuration error causing the problem. Whenever you’re facing network issues, you probably can find the cause in router logs. Spotting anomalies in the volumes of the ordinary traffic is difficult. But with all this traffic, the volume of events can be overwhelming and hard to manage manually. And because any connection will eventually have to pass the router, managing router logs also helps with forensic security analysis. It’s crucial to identify and fix router-related issues as soon as possible.Įven if the issue is related to another device because routers play such a central role in the network, analyzing router logs can help you spot the problem. So, if you have any issues with your router, you’ll probably completely lose connectivity between the devices in your network and to the internet. While it sounds relatively simple, routers do much of the work in a network and sometimes can even do the job of other devices (for example, switch or firewall). It can forward packets from one computer to another and from one network to another. Put simply, a router is a network device that manages network traffic.
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In this post, we’ll walk through how to analyze router logs efficiently. Router logs can tell you a lot about your network.
In smaller networks, routers may even be the only devices managing traffic. If you’re like most network engineers, you usually spend most of the time working with routers (as opposed to other network devices).
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