How to Change the MTU Setting on an Edimax Router for Better Performance

The Maximum Transmission Unit, or MTU, is the largest IP packet an Edimax router sends across a network connection without splitting it into smaller pieces. A suitable value can improve reliability for web browsing, online gaming, video calls, VPN access and file transfers. An unsuitable value can create slow loading, failed logins, buffering or websites that open only after several refreshes.

Changing the MTU setting on an Edimax router for better performance is usually a careful adjustment rather than a speed-boosting trick. The correct number depends on the type of internet service, the connection method used by your Australian ISP and whether another modem or router sits between the Edimax device and the NBN connection. Testing before and after the change helps you avoid solving a problem that MTU was never causing.

What MTU Controls On Your Connection

MTU describes the size of an IP packet at the network layer. Ethernet commonly uses an MTU of 1500 bytes, while PPPoE adds connection overhead and often requires 1492 bytes. If packets are larger than the path can carry, they may be fragmented or discarded. Fragmentation can increase overhead, and discarded packets can cause delays when a device repeatedly retransmits data.

The effect is often subtle. A connection may show a normal speed test result while particular services behave poorly. Secure websites, work VPNs, gaming servers and cloud applications can expose an MTU mismatch because they use packet sizes or encryption patterns that reveal the problem. If only one website fails, DNS, browser security or the website itself may be responsible, so MTU should not be the first setting changed without evidence.

Australian NBN services use several access technologies, including FTTP, FTTC, HFC and fixed wireless. The access technology matters less than the authentication and encapsulation used by the router. A direct DHCP service commonly works with 1500, while PPPoE connections generally need a lower value. Some providers also use VLAN tagging or a separate NBN connection box, so the Edimax WAN settings should match the instructions supplied by the ISP.

An MTU mismatch can be especially noticeable in a home office in Sydney, Melbourne or Brisbane where a corporate VPN is used all day. It may appear as dropped remote-desktop sessions or documents that fail to upload, rather than as an obvious loss of internet speed. That distinction is useful when deciding whether to investigate MTU or another part of the network.

Check The Edimax Internet Setup First

Before changing anything, identify how the Edimax router connects to the internet. Open a browser connected to the Edimax network and try edimax.setup, or enter the router’s local address, commonly 192.168.2.1. The exact address, login details and menu names vary between Edimax models, so check the label, quick-start guide or the model-specific instructions. If another gateway is in front of the Edimax unit, confirm which device is actually performing the WAN connection.

Sign in to the administration interface and look for a menu such as Internet, WAN, Internet Setup, Network or Advanced Settings. Record the existing MTU value and connection type before editing it. If the interface supports configuration backup, save a copy of the current settings. A screenshot or written note of the original number is also useful if the new value causes trouble.

The WAN mode will usually be DHCP, Static IP or PPPoE. DHCP is common where an NBN connection automatically assigns an address, while PPPoE requires an ISP username and password. Telstra, Optus, TPG and smaller Australian providers can use different service profiles, and the correct details may differ between plans. Do not infer the MTU from the brand of the NBN box alone.

When the Edimax is configured as an access point, it may not control the internet-facing MTU at all. The primary modem or router normally handles WAN packets, while the access point simply bridges wireless and wired clients. In that arrangement, changing a LAN or wireless setting on the Edimax will not correct an MTU problem created upstream. A useful router setup reference can help distinguish an access point installation from a full router configuration before you edit the wrong device.

Choose A Sensible Starting Value

For a standard Ethernet or DHCP service, 1500 bytes is the usual starting point. For PPPoE, 1492 is a common starting value because PPPoE uses eight bytes of overhead. Some networks operate correctly at 1500 through special support such as baby jumbo frames, while others need a value below 1492 because of VPN, tunnelling or provider-specific encapsulation. The ISP’s documented recommendation should take priority over a general rule.

Avoid raising the number simply because a larger MTU sounds faster. A device may accept a high value locally while the path to the internet supports less, leading to fragmented packets or silent drops. A smaller MTU can sometimes restore access to affected services, but setting it unnecessarily low creates more packets and additional processing. The practical aim is the largest reliable value supported across the path.

If the router offers separate IPv4 and IPv6 settings, treat them independently. IPv6 does not use router fragmentation in the same way as IPv4, and path MTU discovery has a different role. Many home routers leave IPv6 at its automatic setting. Change it only when you have identified an IPv6-specific problem and know how the Edimax firmware applies the value.

Some Edimax firmware versions display MTU under a PPPoE page, while others place it in a general WAN advanced section. Enter the value without extra characters, save the page and allow the router to reconnect. The internet connection may drop for a short period. Avoid changing MTU, DNS, VLAN values and wireless channels at the same time, because multiple edits make the result difficult to diagnose.

Test The Path Before And After Editing

A basic path-MTU test can show whether large packets are being dropped. On Windows, open Command Prompt and use a command such as ping -f -l 1464 8.8.8.8. The -l number is the data payload, not the complete packet, so add 28 to compare it with an IPv4 MTU. A payload of 1464 corresponds to an MTU of 1492. If the command reports that the packet must be fragmented, reduce the payload in small steps, such as 10 or 12 bytes, until replies succeed consistently.

The Windows test is useful, but a public address may block ICMP traffic or follow a different path from the service you are trying to fix. Test more than one reliable destination, such as a public DNS service and a familiar website, without treating any single result as definitive. On macOS or Linux, the syntax differs; for example, ping -D -s 1464 8.8.8.8 is commonly used for an IPv4 payload test, although operating-system behaviour can vary.

Keep a short record of the largest successful payload, packet loss and latency before changing the router. Then apply the calculated MTU, reboot or reconnect the WAN session, and repeat the same tests. Open several HTTPS sites, run a normal video call and check the application that originally showed the problem. A speed test can be included, but stable browsing and application behaviour matter more than a small change in headline download speed.

A simple relationship helps with the calculation: IPv4 MTU is normally the successful ping payload plus 28 bytes for the IP and ICMP headers. If 1464 is the largest reliable payload, the estimated MTU is 1492. If the result is 1452, the estimated MTU is 1480. Leave a small margin if the results vary, especially on a mobile or fixed-wireless connection where the route can change.

Apply The Change Safely On An Edimax Router

After selecting a value, return to the Edimax WAN or Internet Setup page and enter it in the MTU field. Choose Apply, Save or Save and Reboot, depending on the firmware. Wait for the WAN indicator to reconnect before testing. On some models, the administration page may become temporarily unavailable as the device restarts, so use a wired computer where possible and avoid interrupting power during the save process.

If the Edimax uses PPPoE, start with the provider’s recommended value, commonly 1492, and then test. If it uses DHCP and the path test works at 1500, leave 1500 in place. When a VPN or another tunnel is involved, a lower value such as 1460 or 1400 may be needed, but it should be based on testing or the VPN administrator’s guidance rather than guesswork.

Check the result from more than one device. A phone connected over Wi-Fi, a laptop on Ethernet and a smart television may use different network stacks, and a problem limited to one device could be caused by its adapter, operating system or security software. In homes around Perth, Adelaide or regional Queensland, fixed-wireless and longer access paths can also produce different behaviour from a short local Ethernet test.

If the change makes the network worse, restore the original value and restart the Edimax. If websites still fail, inspect DNS, firewall rules, IPv6, PPPoE credentials and the NBN connection status. A factory reset should be a last resort because it removes wireless names, passwords, port forwarding and ISP settings. Keep the router’s backup file and the original MTU value available before making further changes.

For an Edimax operating in access-point mode, perform the MTU adjustment on the upstream gateway instead. Also check whether an ISP-supplied modem is locked to a particular profile. The Edimax can provide wireless coverage throughout a home, including a detached room or a busy Melbourne apartment, while the modem remains responsible for WAN packet handling.

Once the value has been verified, record it beside the router model, WAN type and ISP details. This makes future troubleshooting quicker after a firmware update, NBN service change or replacement modem installation. Firmware can move the setting to a different menu, but the underlying process remains the same: identify the WAN path, test the largest reliable packet, change one value and verify real applications.

Use the original MTU as a comparison point and change only after a repeatable symptom or path test indicates a mismatch. The next practical step is to log in to the Edimax WAN settings, note the current value, and run a baseline ping test before editing anything.