topic Re: IPv6 on a TP-Link ER605 router in IPv6 Trial

IPv6 on a TP-Link ER605 router

IMM — Fri, 25 Apr 2025 10:16:38 GMT

Ok, I seem to have this working - to an extent with the following settings...

However as soon as the router connects, I seem to get the following entry into system log at 1 or 2 second intervals

Is this normal?

If, as I suspect not, do you think it is due to my settings or a "feature" of the ER605?

Ian

Re: IPv6 on a TP-Link ER605 router

MisterW — Fri, 25 Apr 2025 10:46:53 GMT

@IMM

Is this normal?

No, looks like its constantly trying to renew the connection.

Looking at the manual , for the 'Get IPv6 address' does selecting SLAAC + Stateless DHCP make any difference , or even AUTO ?

I'm actually using an ER605 myself, The hardware is good but I'm afraid I gave up on TPLink firmware some time ago and flashed it with native Openwrt. It obviously doesnt work with the Omada controller and is a one-way trip, there's no going back to the factory firmware. Quite a steep learning curve as well...

Re: IPv6 on a TP-Link ER605 router

IMM — Fri, 25 Apr 2025 12:26:49 GMT

@MisterW for the 'Get IPv6 address' does selecting SLAAC + Stateless DHCP make any difference.

If I use that, the "IPv6 address" field remains as :: and the Lans only have link local addresses.

If I use Auto, I seem to get the same result as using DHCPv6

Re: IPv6 on a TP-Link ER605 router

MisterW — Fri, 25 Apr 2025 18:24:08 GMT

@IMM that's sort of what I expected but it was worth a try. AIUI it should be using DHCPv6 to get an IPv6 prefix.

If you look at my Openwrt configuation for the IPv6 WAN interface below

Its set as a DHCPv6 client and uses the existing PPPoE tunnel (@wan) to communicate. I assume in your case thats the 'Use same PPPoE connection as IPv4'

It definitely shouldn't be logging a connect attempt evry 2 seconds! I'd suggest posting on the TpLink business forums to see if anyone has any ideas https://community.tp-link.com/en/business/forum/794?page=1

Moderator's note by Mike (Mav): Personal information removed from a public forum.

Re: IPv6 on a TP-Link ER605 router

MisterW — Fri, 25 Apr 2025 13:04:48 GMT

@IMM there's another report of the same logs here https://community.tp-link.com/en/business/forum/topic/267282 . However that was with an ER605 V1 with early firmware. I assume yours is a V2 and are you on the latest firmware ?

The latest relaesed seems to be 2.2.6 https://support.omadanetworks.com/uk/product/er605/?resourceType=download

although there is a 2.3.0 pre-release today!! https://community.tp-link.com/en/business/forum/topic/255644

Re: IPv6 on a TP-Link ER605 router

IMM — Fri, 25 Apr 2025 14:06:44 GMT

Yes, V2.0 hardware and latest 2.2.6 Build 20240718 Rel.82712 firmware.

I've downloaded the 2.3.0 release but I'm not sure I'm brave enough to install it - I think I may wait until it appears on the official release list and then give it a go.

Re: IPv6 on a TP-Link ER605 router

MisterW — Fri, 25 Apr 2025 14:41:29 GMT

There's nothing obvious in the release notes but they are a bit brief. The 'virtual wan MIGHT be related but it's a bit vague!

Re: IPv6 on a TP-Link ER605 router

zpeterk — Sat, 26 Apr 2025 08:11:12 GMT

My ER7206 also shows a link local address and when connected stops internet access

Re: IPv6 on a TP-Link ER605 router

MisterW — Sat, 26 Apr 2025 08:15:43 GMT

@zpeterk

My ER7206 also shows a link local address and when connected stops internet access

So it doesnt allocate IPv6 addresses to LAN clients ?

does your ER7206 show the continuous logs ?

Re: IPv6 on a TP-Link ER605 router

zpeterk — Sat, 26 Apr 2025 08:50:02 GMT

@MisterW wrote:

@zpeterk

My ER7206 also shows a link local address and when connected stops internet access

So it doesnt allocate IPv6 addresses to LAN clients ?

does your ER7206 show the continuous logs ?

I have not tried it on the lan side as the IPv6 addresses are being alocated from a different wan

Re: IPv6 on a TP-Link ER605 router

zpeterk — Sat, 26 Apr 2025 10:26:45 GMT

So my ER7206 is doing the same. The clients are getting addresses OK

Re: IPv6 on a TP-Link ER605 router

MisterW — Sat, 26 Apr 2025 10:28:56 GMT

@zpeterk it doesnt surprise me, I would guess the firmware for both the ER7206 & the ER605 are from the the same underlying base.

I suggest bot you and @IMM post on the TP Link business forum and see if there's any explanation.

Re: IPv6 on a TP-Link ER605 router

zpeterk — Sat, 26 Apr 2025 10:49:15 GMT

Just to add my other IPv6 wan connection isn't filling the log.

It would appear the router can't cope with two IPv6 wans as the PD has to be specified in the lan settings and therefore can't fall back to the other wan in the event of failure.

I have been to the TP Link forum before and got no joy at all!

Re: IPv6 on a TP-Link ER605 router

MisterW — Sat, 26 Apr 2025 13:08:13 GMT

There's another old thread on the Tplink forums reporting the IPv6 repeated connection attempts

https://community.tp-link.com/en/business/forum/topic/252854?sortDir=ASC&page=1

Re: IPv6 on a TP-Link ER605 router

zpeterk — Sun, 27 Apr 2025 07:28:48 GMT

@IMM

Have you set any ACL rules to get it to work?

Re: IPv6 on a TP-Link ER605 router

IMM — Sun, 27 Apr 2025 08:39:52 GMT

@zpeterk wrote: Have you set any ACL rules to get it to work?

No.

I think the default behavior seems to be the same as for IPv4 -

All incoming connections from WAN are dropped.

Outbound traffic to the WAN is allowed.

Traffic is routed between the (non WAN) VLans (I assume I can add access control rules to stop that but have not yet tried to do so.)

My setup for IPv6 was

1. Configure the WAN (as your post 8 )

2. Configure the LAN (as in my first post) As part of that I think I had to enable the prefix delegation server and add an entry.

Then my windows 10 and 11 PCs would connect -

Android phone, iPhone and iPad also pick up IPv6 addresses, though were slow to do so but I think that may be due to a problem with my home network.

Re: IPv6 on a TP-Link ER605 router

IMM — Sun, 27 Apr 2025 08:47:35 GMT

Here's a screenshot of my IPv6 LAN page after configuration.

Re: IPv6 on a TP-Link ER605 router

zpeterk — Sun, 27 Apr 2025 09:56:26 GMT

@IMM

Thanks for that, all working now, but only one WAN at a time.

Re: IPv6 on a TP-Link ER605 router

IMM — Sun, 27 Apr 2025 10:09:55 GMT

I only have one WAN - so cannot try anything out.

However If you have more than 1 Vlan, I wonder whether you could delegate one WAN to Vlan1 and another WAN to Vlan2 etc.

Similarly, once it is initially set up, I wonder whether you can add entries to the prefix delegation server so that more than one WAN delegates to each Vlan

I'll have to let you experiment with that as I can't.

Re: IPv6 on a TP-Link ER605 router

MPC — Sun, 27 Apr 2025 10:51:23 GMT

For IP6 with multiple WAN links, you have to be careful to ensure that the right IP addresses go to each WAN.

If WAN1 gives you aa:bb:cc:dd::/YY and WAN2 gives you ee:ff:gg:hh::/ZZ then usually you can't send WAN1's traffic over WAN2 and vice-versa as the providers have anti-spoofing rules in place.

That isn't usually an issue for IP4 traffic as that's usually handled by NAT.

I'm not familiar with this particular device's capabilities, but you handle this using 'policy based routing' on Linux systems.