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, store connection logs, and optimize traffic routing. Over time, this "digital junk" accumulates, which can lead to slowing down the internet speed, spontaneous connection breaks or even router freezingMany users mistakenly believe that rebooting the router solves the problem, but in reality, it only temporarily resets active sessions without affecting deep system files.

In this article you will find detailed instructions for clearing cache for popular router models (TP-Link Archer C6, ASUS RT-AX88U, Keenetic Giga etc.), you'll learn when exactly the procedure is needed, and when a simple reboot is sufficient. We'll also examine hidden risks incorrect cleaning - for example, why after a reset access to the settings may be lost 192.168.1.1 And how to avoid it. If your Wi-Fi has started to slow down for no apparent reason, and your provider claims everything is fine on their end, these instructions will help restore your network's stability.

What is a router cache and why should it be cleared?

A router's cache is a collection of temporary files that the device creates during operation. This includes:

• 📡 ARP tables (matching IP and MAC addresses of devices on the network)
• 🔄 Connection logs (login history, errors, warnings)
• 🚀 DNS cache (stored domain name and IP mappings)
• 🔒 Session keys (data for quick reconnection of devices)

Under normal conditions, the cache speeds up network performance, reducing response times. For example, when you first visit a website vk.com, the router remembers its IP address so that the next time a request is made, it doesn't waste time on a DNS lookup. However, over time, this data becomes outdated, errors accumulate, and instead of being useful, the cache begins to slow down the networkTypical signs of a clogged router:

• 🐢 The internet is intermittent, but the cable connection is stable.
• 🔌 Devices suddenly disconnect from Wi-Fi, even though the signal is strong
• 🔄 Pages take a long time to load, but after rebooting the router the problem disappears (temporarily)
• 🚨 Errors like this appear in the admin panel "DHCP exhausted" or "Too many ARP entries"

⚠️ Attention: Don't confuse your router cache with your browser cache! Clearing your browsing history in Chrome or Safari doesn't affect your router's performance. Also, don't clear the cache "just in case"—it can temporarily slow down your network while your router recollects relevant data.

When Clearing the Cache Is Really Necessary

Not every Wi-Fi slowdown requires clearing the cache. Here specific cases, when the procedure is justified:

If your problem doesn't fit into the table, first check:

1. Signal quality (possibly interference from neighboring networks on the same channel)
2. Provider settings (sometimes speed limits are imposed by the operator)
3. Router firmware (outdated software may conflict with modern devices)

⚠️ Attention: On some routers (for example, Zyxel Keenetic series Hero) The cache is cleared automatically upon reboot. In this case, manually clearing it may reset user settings, such as device priorities in QoS.

Step-by-step instructions: how to clear the cache on different routers

The cleaning method depends on the device model and firmware. Below are instructions for the most common brands. Before we begin:

Make a backup copy of your router settings (if there is such a function)|

Write down or take a photo of your current Wi-Fi settings (network name, password)|

Connect to your router via cable (not Wi-Fi)|

Close all programs using the Internet

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1. TP-Link routers (Archer, Deco, TL-WR)

For models with firmware TP-Link Omada or the standard web interface:

1. Open the admin panel at http://tplinkwifi.net or 192.168.0.1.
2. Go to Additional settings → System tools → Diagnostics.
3. Find the section Clearing the cache (or Reboot Schedule for older models).
4. Click Clear Cache or Clear.
5. Confirm the action and wait for the reboot (2-3 minutes).

For TP-Link Deco (mesh systems):

1. Open the app TP-Link Deco.
2. Go to Settings → Advanced → System Tools.
3. Select Cleaning the system and confirm.

2. ASUS routers (RT-AX, RT-AC, ZenWiFi)

In firmware Asuswrt-Merlin and standard:

1. Log in to the web interface router.asus.com.
2. Go to Administration → System Settings.
3. In the block Cleaning click Clear DNS cache And Clear the ARP table.
4. For a complete cleanup, select Reboot with a check mark Clear cache on reboot.

For ASUS ZenWiFi (AiMesh systems):

1. Open the app ASUS Router.
2. Select your network → Settings → System.
3. Tap Clearing the cache and confirm.

3. Keenetic routers (Giga, Hero, Ultra)

In firmware KeeneticOS 3.x and newer:

1. Log in to the web configurator my.keenetic.net.
2. Go to System → Monitoring → Logs.
3. Click Clear logs (this will delete some of the cache).
4. For a complete cleanup, go to System → Configuration and select Restart with clear cache.

In the appendix Keenetic:

1. Open the section Device → Diagnostics.
2. Select Cleaning the system.

4. Zyxel, D-Link, and Mercusys routers

For these brands the procedure is similar:

1. Log into your control panel (usually 192.168.1.1 or 192.168.0.1).
2. Find the section Maintenance (Service) or System Tools.
3. Select Clear Cache, Reboot with cleaning option or Factory Defaults (the latter will reset all settings!).

On Zyxel with firmware Keenetic (old models) the path may differ: System → Memory → Clear cache.

What to do if clearing the cache didn't help

If you still have Wi-Fi issues after cleaning, check the following:

• 🔌 Router power supply: Use the original power supply. Cheap replacements may cause unstable operation.
• 📶 Wi-Fi channel: In the admin panel, check if the current channel is overloaded (use utilities like Wi-Fi Analyzer for ether analysis).
• 🔄 Firmware: Outdated software may conflict with modern devices. Update the firmware in the section Firmware Upgrade.
• 🛡️ Safety: If you use WPA3, try switching temporarily to WPA2-PSK - some devices do not work correctly with the new standard.

If none of the methods helped, the problem may lie in:

• Hardware failure of the router (chip overheating, RAM failure).
• Restrictions from the provider (for example, DPI - deep packet inspection).
• Viral activity on the network (botnets or infected devices overload the router).

How to check if a router is overheating?

If the router body is hot to the touch, and the problems disappear after turning it off for 10-15 minutes, this is a sign of overheating. Solutions:

1. Move the router to a ventilated area (not in a closed closet!).

2. Use a cooling pad (for example, for laptops).

3. If your router is older than 5 years, consider replacing it—the thermal paste inside may have dried out.

How to Clear Router Cache via Telnet/SSH (Advanced)

If the web interface does not provide cleaning options, and the router supports Telnet or SSH, you can use the command line. Attention: This method requires caution - incorrect commands can damage the device!

Example for routers based on OpenWRT or DD-WRT:

1. Connect to the router via SSH (use PuTTY or the built-in terminal in macOS/Linux).
2. Enter login/password (usually root and password for the web interface).
3. Execute the commands one by one:

   ip neigh flush all # Clear the ARP cache
   echo 3 > /proc/sys/vm/drop_caches # Clear kernel cache (Linux-based)
   killall dnsmasq # Restart the DNS server
   service network restart # Restart network interfaces

4. Reboot the router with the command reboot.

For routers MikroTik (RouterOS):

/ip arp remove [find]
/ip dns cache flush
/system reboot

⚠️ Attention: On some routers (for example, Huawei HG8245) access by Telnet/SSH Disabled by default. You can enable it through the web interface in the section Security → Remote Management, but this may violate the provider's warranty or terms.

How to Avoid Frequent Cache Clearing: Prevention

To avoid having to clear your cache regularly, follow these recommendations:

• 🔄 Automatic reboot: Set your router to reboot weekly on a schedule (optional) Reboot Schedule in most firmware versions).
• 📊 Log limitation: In the system settings (System Log) Reduce the log detail level or disable logging of non-critical events.
• 🛡️ Control of connected devices: Disconnect unused gadgets from the network - each of them creates entries in the ARP table.
• 🔧 Firmware update: Check for updates regularly—new versions often optimize memory management.

Critical information: On routers with a small amount of RAM (for example, TP-Link TL-WR740N (With 32 MB of RAM), the cache fills up faster. If your router is older than 2018 and has less than 64 MB of RAM, consider upgrading—modern Wi-Fi 6 standards require more resources.

Common errors when clearing cache and how to avoid them

Many users make mistakes that, instead of solving problems, actually make them worse. Here are the most common ones:

Another typical problem is loss of access to the web interface after cleaning. This happens if:

• The cache contained IP-MAC binding data (for example, it was enabled in the security settings) IP-MAC Binding).
• Cleaning reset the settings DHCP, and your computer does not receive a new IP.

Solution: connect to the router via cable, manually assign yourself an IP from the router's subnet (for example, 192.168.1.100) and try to log into the control panel again.

FAQ: Answers to Frequently Asked Questions

Is it possible to clear the router cache from a phone?

Yes, if the router has a mobile app (for example, TP-Link Tether, ASUS Router or Keenetic). In most apps, the option to clear the cache is located in the "System" or "Maintenance" section. If there's no mobile app, you can use your smartphone's browser to access the router's web interface (the address is usually found on the device's sticker).

How long does it take to clear the cache?

The process typically takes between 30 seconds and 2-3 minutes, depending on the model. The router will reboot automatically. If after 5 minutes the indicators don't light up or are blinking abnormally (for example, all are red), this indicates a malfunction. Try physically turning the device off and on again.

Will my Wi-Fi password be reset after clearing the cache?

No, clearing the cache does not affect the main settings, including the network name (SSID) and password. However, if you select the option Factory reset (Factory Reset), all personal data will be lost. Always double-check which button you're pressing!

Is it possible to clear the cache for only one device on the network?

No, the router cache is system data and cannot be cleared selectively for individual devices. However, you can:

1. Forget the device in the Wi-Fi settings (in some routers this removes its entry from the ARP table).
2. Temporarily disconnect the device from the network for 10-15 minutes - its cached data will become outdated and will be deleted automatically.

Will clearing the cache help increase internet speed?

It depends on the cause of the slowdown. Clearing the cache will help if:

• The problem is caused by an overflowing ARP table or stale DNS records.
• The router freezes due to a large number of temporary files.

If the speed is limited by your ISP or the problem is a weak Wi-Fi signal, clearing the cache won't have a noticeable effect. For a more accurate diagnosis, check the speed via a cable (for example, speedtest.net) and compare with a wireless connection.