How to disable IPv6 on the edge gateway

5 Nov 2026
Knowledge

Question

When you're experiencing connectivity issues on an IXON edge gateway, you can try disabling IPv6. The edge gateway normally falls back to IPv4 when it's unable to connect using IPv6, but in networks that do not have IPv6 fully set up correctly, this may not always be the case. Disabling IPv6 then forces the edge gateway to use IPv4.

It's difficult to determine beforehand whether IPv6 is indeed the issue. To make sure, simply disable it, compare the result with before, and enable it again if it didn't resolve your connectivity issues.

So, how can you disable IPv6 on the IXON edge gateway?

Answer

Supported hardware

SecureEdge and SecureEdge Pro, firmware 5.8 and up (upgrade)
IXrouter3, firmware 3.22 and up (upgrade)

Some things to take into account:

The IPv6 changes will remain after a firmware upgrade.
The IPv6 changes will be reset by a factory reset.

IXrouter3

On IXrouter3 models you can disable IPv6 by following these steps

Create a new text file named ixrouter.conf.

Copy this content to the file:

ixrouter.wan.ipv6=false
ixrouter.wan.wlan_ipv6=false
ixrouter.wan.3g_ipv6=false

Place the file on an empty USB flash drive.
Turn off the IXrouter.
Insert the USB stick into the IXrouter and power it on.
Wait a minute for the configuration to be applied.
Remove the USB flash drive from the IXrouter.
Reboot the IXrouter.

If it didn't resolve the connectivity issues, you can enable IPv6 again by following the same steps, but replace all the "false" at step 2 by "true".

SecureEdge and SecureEdge Pro

On SecureEdge and SecureEdge Pro models you can disable IPv6 by following these steps

Connect locally to one of the LAN ports of the edge gateway or set up a VPN connection.
- The local web interface is not accessible from the WAN side (Cloud port and also OT/LAN port when it's configured as WAN2).
Open a new browser tab, go to the edge gateway's LAN IP address, and log in.
- The default LAN IP address is 192.168.140.1.
- If you're connecting locally, make sure that your laptop has an IP address in the same range. You may need to configure this manually. There are many online guides on this if you need a step by step guide.
- The default username is admin.
- The default password (PW) is printed on the side of the edge gateway.
- The number of login attempts is limited per time window, in compliance with cybersecurity standard IEC 62443-4-2. By default, the number of login attempts is limited to 5 per 1 minute, replenishing a login attempt every 1 minute. We recommend you configure this to align with your corporate security policy. Do so by logging in and going to Administration > Authentication.
- You can change the password by logging in and going to Administration > Change password.
Go to Network > WAN and disable or enable IPv6 configuration at the relevant connection types.

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How to disable IPv6 on the edge gateway

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