Clearing your Wi-Fi router's cache: why it's necessary and how to do it correctly

A Wi-Fi router's cache is temporary data that the device stores to speed up network performance. This includes IP addresses, routing tables, connection logs, and even firmware fragments. Over time, this "junk" accumulates, which can lead to slow internet speeds, spontaneous device disconnections, or errors like DNS_PROBE_FINISHED_NXDOMAINBut how do you know if the problem is in the cache, and not in the provider or settings?

Clearing the router cache is a procedure that many users perform once every 3-6 months for preventative purposes. However, Not all models support software cache reset. Via the web interface. In some cases, a full factory reset is required, which results in the loss of all personal settings (network name, password, device priorities). We'll cover both methods and explain how to minimize risks and preserve important settings.

Signs that your router cache needs clearing

Don't rush to reset the settings at the first failure. Here key symptoms, indicating a cache overflow:

• 🔄 Pages in the browser take longer than 5 seconds to load, although the internet speed according to tests (speedtest.net) is normal.
• 📵 Devices (smartphones, laptops) periodically lose their Wi-Fi connection, even though the router has not been rebooted.
• 🔌 When connecting new gadgets, an error appears "Unable to obtain IP address".
• 🖥️ In your provider's personal account, you can see that the router frequently reconnects to the network (logs DHCP Renew).
• 🔍 Search engines (Google, Yandex) return an error ERR_NAME_NOT_RESOLVED, although other sites open.

If you recognize at least 2-3 of the items on this list, the probability of a clogged cache is ~70%. But before clearing it, check:

1. Was the router updated automatically (sometimes new firmware contains bugs).
2. Are there any devices connected to the network with viruses (they can clog the router's ARP table).
3. Have your provider's settings changed (for example, DNS servers changed).

What is the difference between clearing the cache and resetting the settings?

Many users confuse these procedures, but they are fundamentally different:

Clearing the cache does not delete saved Wi-Fi passwords, device priorities (QoS), and firewall rules, while a hard reset erases everything. If your router supports separate cache clearing (for example, models ASUS RT-AX88U or Keenetic Ultra), use it. Otherwise, you'll have to do a full reset.

How to clear the cache via the web interface (step by step)

If your router supports software-based cache clearing, follow these instructions. We'll walk you through the process using popular brands as examples: TP-Link, ASUS And Keenetic.

For TP-Link routers (Archer, Deco, TL-WR)

1. Connect to the router via cable or Wi-Fi.

2. Open your browser and enter in the address bar 192.168.0.1 or 192.168.1.1 (the exact address is indicated on the device sticker).

3. Enter your login and password (default admin/admin).

4. Go to the section Additional settings → System tools → Diagnostics.

5. Find the button Clear the ARP cache or Reset the routing table (in new firmware versions it may be called Clear Cache).

6. Confirm the action and wait for the reboot (1-2 minutes).

For ASUS routers (RT-AX, RT-AC, ZenWiFi)

1. Go to the web interface at router.asus.com.

2. Go to Administration → System Settings.

3. In the block Cleaning click Clear DNS cache And Clear the routing table.

4. Save the changes and reboot the router.

For Keenetic routers (Giga, Ultra, Hero)

1. Open the interface at the address my.keenetic.net.

2. Go to System → Monitoring → Statistics.

3. Click Clear cache in the section ARP table.

4. Additionally, you can reset DHCP lease in the same menu.

Disconnect all devices from the router except the PC | Take screenshots of the current Wi-Fi settings | Check the firmware version in the "System" section | Prepare a backup copy of the configuration (if there is an Export function) -->

If your router doesn't have a separate cache clearing option, skip to the next section, which describes a hard reset.

What should I do if the internet still doesn't work after cleaning?

1. Check if the WAN (Internet) indicator on your router is lit. If not, the problem is with your ISP.

2. Reconnect the cable from the provider to another WAN port (if there are several).

3. In the router's web interface, update the IP address in the section Network → WAN (button Release/Renew).

4. If PPPoE is used, check that the login/password entered from the provider is correct.

Hard reset the router (if clearing the cache is not available)

If your router model doesn't support software-based cache clearing, the only way is a full factory reset. This will remove all personal data, including:

• 🔐 Wi-Fi name and password;
• 📡 Guest network settings;
• 🔄 Port Forwarding Rules;
• 🛡️ Firewall and parental control settings;
• 📱 Devices bound by MAC address.

To perform a reset:

1. Find the small hole marked on the back of your router. Reset or WPS/Reset.
2. Take a paper clip or a toothpick, press and hold the button for 10-15 seconds (until the indicators start flashing).
3. Release the button and wait for the reboot (2-3 minutes).
4. Connect to the router via cable and configure it again through the web interface.

⚠️ Attention: On some routers (for example, Zyxel Keenetic) short press on Reset A short press (1-3 seconds) resets only the Wi-Fi settings, while a longer press (10+ seconds) resets the entire device. Check the instructions for your model!

How to save settings before resetting

To avoid having to reconfigure your router from scratch after clearing the cache, you can export the current configuration. Here's how:

Method 1: Backup via web interface

1. Go to your router control panel.

2. Find the section System Tools → Backup/Restore (or Administration → Backup).

3. Click Save or Export — file with extension .cfg or .bin will be downloaded to your PC.

4. After reset, download this file back through Restore (Import).

Method 2: Manually export key parameters

If there is no backup function, write it down manually:

• 📝 Name and password of the main/guest Wi-Fi network;
• 🔑 Encryption type (WPA2-PSK, WPA3);
• 🌐 WAN settings (connection type: DHCP, PPPoE, static IP);
• 🔢 Login/password from your provider (if PPPoE is used);
• 📡 Wi-Fi channel and bandwidth (20/40/80 MHz).

⚠️ Attention: Restoring your configuration from a backup may restore old issues if they were caused by corrupted settings. Use this method only if you are certain that resetting the cache won't help.

Common errors when clearing the router cache

Even experienced users sometimes make mistakes that lead to even bigger network problems. Here are the most common ones:

• 🔌 Resetting the router during a firmware update. This can brick your device. Always check to see if an update is in progress before clearing the cache.
• 📱 Using a mobile browser to configure. Some features of the router's web interface don't work correctly on smartphones. Use a PC or laptop.
• 🔄 Aborting the reboot process. If your router takes a long time to process after clearing the cache, don't unplug it—wait until it fully boots up (up to 5 minutes).
• 🔐 Restore old configuration without verification. If the backup was created before the problems occurred, it may contain the same errors. It's best to reconfigure the router.
• 📡 Ignoring firmware updates. If the cache gets clogged frequently, outdated firmware may be to blame. Check the manufacturer's website for the latest version.

Another typical mistake is Clearing the cache on dual-boot routers (For example, ASUS with Rescue Mode). In this case, a reset may result in switching to a backup firmware, which will require additional configuration.

How to reduce cache accumulation in the future

To reduce the need for cleaning, follow these tips:

• 🔄 Reboot your router once a week. This clears RAM and temporary data without losing settings. Use smart plugs with a timer to automatically reboot at night.
• 🛡️ Update your firmware. Manufacturers regularly release patches that optimize memory management. Check for updates every 2-3 months.
• 📵 Limit the number of connected devices. Each device takes up space in the ARP table. Disable unnecessary devices or use a guest network for temporary connections.
• 🔗 Use static IPs for permanent devices. This reduces the load on the router's DHCP server. Configure IP reservation by MAC address in the section Local Area Network → DHCP.
• 🌐 Disable unnecessary features. For example, IPv6, UPnP or QoS, if you don't use them. They take up additional resources.

For advanced users: If your router supports SSH (For example, ASUS with Merlin firmware), you can manually clear the cache using the command:

ip neigh flush all

This command resets the ARP table without rebooting.

FAQ: Frequently asked questions about clearing your router's cache

❓ Do I need to clear the cache on new routers (2026-2026)?

Modern routers (for example, TP-Link Archer AX75 or ASUS RT-AX86U Pro) have more RAM and better cache management. Cleaning is required less frequently—once every 6-12 months, unless there are obvious problems. However, even new models can slow down due to the large number of connected devices (50+).

❓ Is it possible to clear the router cache using a mobile app?

Yes, many manufacturers have added this feature to their apps:

• TP-Link Tether: More → System Tools → Clear Cache.
• ASUS Router: Settings → Administration → Clear cache.
• Keenetic: System → Diagnostics → Clear ARP.

But please note that not all web interface features are always available in mobile applications.

❓ Why do some websites load more slowly after clearing the cache?

This is a temporary phenomenon. After flushing the DNS cache, the router has to resolve domain names again (convert yandex.ru to the IP address). Usually, the speed is restored within 10-15 minutes. If the problem persists for more than an hour, check the DNS settings in the router (it is better to use 1.1.1.1 or 8.8.8.8).

❓ Can clearing the cache damage the router?

No, the procedure itself is safe. However, if during the cleaning:

• Turn off the router's power;
• Press the button Reset;
• Abort the firmware update,

There may be problems. Always wait until the process is complete (the indicators should be steady, not blinking).

How do I clear the cache on routers from my ISP (Rostelecom, Beeline, MTS)?

Routers from providers (for example, Sagemcom 2804 from Rostelecom or Sercomm H500s (from MTS) often have limited functionality. They may not have a separate cache clearing option. In this case:

1. Take screenshots of all settings in the web interface.
2. Perform a hard reset (button Reset).
3. Call your provider's support team and ask them to send you an SMS with the settings for automatic configuration (this usually takes 5-10 minutes).

Some providers block access to advanced settings; in this case, clearing the cache is only possible through a reset.