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

Have you noticed your internet has slowed down, and your devices are periodically disconnecting from Wi-Fi? Your router's cache may be overloaded. Router cache is temporary data that your device stores to speed up request processing, but over time, it accumulates and begins to slow down your network. Unlike your browser's cache, which can be cleared in a couple of clicks, clearing a router's cache is more complicated: there's no universal "Clear All" button, and incorrect actions can reset all settings.

In this article you will find Step-by-step instructions for popular router models (TP-Link, ASUS, Keenetic, MikroTik and others), you'll learn when clearing the cache is really necessary, and when a simple reboot will solve the problem. We'll also look at hidden risks For example, why saved Wi-Fi passwords or port settings may disappear after resetting the cache. If you've never accessed your router's admin panel, don't worry: everything is described from scratch, with interface illustrations and explanations of technical terms.

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

The router cache is a temporary memory that stores:

• 📡 DHCP leases (binding IP addresses to devices on the network)
• 🔄 Routing tables (data transfer paths between devices)
• 🔐 Authorization logs (connection and error history)
• 📦 Packet buffer (undelivered or pending data)

Over time, this data accumulates, takes up the router's RAM, and can cause:

• ⚡ Slow internet speed (especially noticeable on older models with 32–64 MB of RAM)
• 🔌 Spontaneous device shutdowns from Wi-Fi
• 🚫 Connection errors (for example, "IP conflict" or "Limited access")
• 🔄 Admin panel freezing router

However Clearing the cache doesn't always solve internet problems.If the slowdown is caused by congestion on your ISP's line, a faulty cable, or outdated router firmware, clearing the cache will have a temporary effect or may not help at all. Before proceeding, test your internet speed via cable (by connecting your computer directly to the router) and compare it with your ISP's data.

⚠️ Attention: On routers with firmware OpenWRT or DD-WRT Clearing the cache is different than with standard firmware. If your router is running custom firmware, use the commands via SSH (instructions will be below).

When Clearing the Cache Is Really Necessary: ​​5 Signs

Don't clear your router's cache "just in case"—it can lead to unnecessary crashes. Pay attention to the following symptoms:

If you are watching only one of the symptoms (for example, slow Wi-Fi on one device), first check its settings. Windows run the command in CMD:

ipconfig /flushdns

On Android or iOS Try "forgetting the network" and reconnecting. If the problem persists on all devices, try clearing the router's cache.

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

The cleaning method depends on the router model and firmware. Below are instructions for the most common brands. If your model is not listed, use universal method (section 4).

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

In routers TP-Link The cache is cleared through the section System tools:

1. Open the admin panel at 192.168.0.1 or 192.168.1.1 (login and password are usually admin).
2. Go to Additional settings → System tools → Diagnostics.
3. Click the button Clear cache (or Reboot, if there is no option, this will reboot the router and reset temporary data).

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

On ASUS the process is a little more complicated:

1. Go to the panel at the address router.asus.com.
2. Open Administration → System Settings.
3. In the section Cleaning select Clear DNS cache And Clear the routing table.
4. Save the settings and reboot the router.

3. Routers Keenetic (Giga, Hero, Viva)

Keenetic uses its own interface NDMS:

1. Log in to the web configurator at my.keenetic.net.
2. Go to System → Monitoring → Memory.
3. Click Clear cache (if the option is missing, use the command system memory clear V CLI).

4. Universal method (for any router)

If your router's interface doesn't have an explicit option to clear the cache, do the following:

Disconnect the router from the power supply | Press and hold the Reset button (10-15 seconds) | Connect the power supply without releasing the Reset button | Release the button after the indicators flash-->

This method performs soft reset, which clears the cache but preserves the basic settings (Wi-Fi name, password, PPPoE). If the speed hasn't been restored after this procedure, try full reset (factory settings) - but keep in mind that you will have to configure the router again.

⚠️ Attention: On routers with dual firmware (for example, Zyxel Keenetic or MikroTik) long-term retention Reset (more than 30 seconds) may cause the device to switch to the backup firmware. This is not a reset, but a mode switch!

Clearing the cache via the command line (for advanced users)

If your router supports access via SSH or Telnet (for example, models on OpenWRT, DD-WRT, MikroTik RouterOS), you can clear the cache using commands. This method is suitable for:

• 🖥️ Routers with custom firmware
• 📶 Industrial access points (Ubiquiti, TP-Link Omada)
• 🔧 Routers for office networks

Instructions for MikroTik RouterOS:

/ip dns cache flush
/system routerboard settings set protected-routerboot=no
/system reboot

For OpenWRT/DD-WRT:

echo 3 > /proc/sys/vm/drop_caches
service dnsmasq restart

If you are unsure of the command syntax, do not use this method — This error may result in loss of access to the router. It's best to consult your model's documentation or use the web interface.

What should I do if the router doesn't turn on after clearing the cache?

If the router does not respond to the power button or the indicators are not lit, try:

1. Disconnect the power supply for 1–2 minutes, then reconnect it.

2. Hold the Reset button for 30+ seconds (until the indicator colors change).

3. Connect the router to the computer via cable and check if it is detected in "Network Connections".

If nothing helps, there may be a firmware glitch. In this case, you'll need to reflash the firmware. TFTP (look for instructions for your model).

What to do after clearing the cache: checking and optimizing

Clearing the cache is just the first step. To consolidate the results:

1. Restart all devicesWi-Fi-connected devices (smartphones, laptops, Smart TVs). This will update their IP addresses on the network.
2. Check your internet speed through services like speedtest.net or fast.comCompare with data before cleaning.
3. Update your router firmware (if a new version is available). This will fix known bugs and improve performance.
4. Set up automatic reboot router (for example, once a day). This option is available in most modern models.

If the speed is still slow, check:

• 📶 Wi-Fi channel congestion (use apps like Wi-Fi Analyzer to select a free channel).
• 🔌 Cable condition from the provider (kinks, damage to insulation).
• 🛡️ Active connections — There may be other devices connected to your network.

Common mistakes and how to avoid them

When clearing the cache, users often make mistakes that exacerbate problems. Here are the most common ones:

Another typical mistake is ignoring firmware updatesManufacturers regularly release patches that optimize router memory management. For example, in firmware ASUS versions 3.0.0.4.386 and newer versions clear the cache automatically upon reboot, but in older versions this has to be done manually.

⚠️ Note: Router interfaces and available options may vary depending on region and firmware version. If your admin panel doesn't have these sections, please consult the user manual for your model.

FAQ: Answers to frequently asked questions

How often should I clear my router cache?

For home routers, cleaning is sufficient once every 3–6 months, unless there are obvious problems. In office networks with a large number of devices, this should be done once every 1-2 months. Regularly rebooting the router (once a week) reduces the need for manual cache clearing.

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

Yes, but not in all models. For example, in the app TP-Link Tether or ASUS Router There is a reboot option that indirectly clears the cache. However, a full clear is only available through the web interface or SSH.

Why do some devices not connect to Wi-Fi after clearing the cache?

This is due to the reset DHCP tables. Solution:

1. Restart the problematic device.
2. If that doesn't help, "forget" the network in your Wi-Fi settings and reconnect.
3. Configure it on your router static IP for this device (in the section DHCP reservation).

Will clearing the cache delete my browsing history?

No, the router does not store the user's browsing history (this is done by the browser or ISP). The router cache only contains technical data about routing and connections. However, if you used parental control or traffic logs, these records may be reset.

My router doesn't have a cache clearing option. What should I do?

In this case:

1. Use soft reset (holding Reset 10–15 seconds).
2. Update your firmware—new versions often add missing features.
3. If your router is old (manufactured before 2015), consider replacing it—modern models manage memory better.