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[Hard Harry]

DIR-615 shows this MAC address for LAN: 00:26:5a:ac:6c:88 and for wireless:  00:26:5a:ac:6c:89  <-- This is the WAN and LAN MAC of the DIR-615

DIR-615 DHCP client list: DESKTOP-QAFPST4 F8:A9:63:88:A2:82  <--- This is your computer

TP Link status page shows this MAC address for LAN: MAC Address: 84-16-F9-AE-A8-6C <--- This is a TP-Link WAN MAC. It is show on TP-Link status page

TP Link DHCP client list:

1   DESKTOP-QAFPST4   EC-08-6B-19-8F-46 <----- This is TP-Link MAC address.
3   DIR-615   00-26-5A-AC-6C-89  <--- This is Dlink's WAN MAC address.

So, first thing I notice is the two DHCP client lists mention my PC with different MAC addresses. Why? Second thing I notice is... the wireless MAC address in the DIR-615 status page is the exact same one as listed for the DIR-615 in the TP Link's DHCP client list...

See my edits above for explanation.

I agree the MAC EC-08-6B-19-8F-46  is unusual. Could it be the MAC address of your laptop's wireless adapter? It would make sense that your laptop's ethernet and wireless adapter would have different MAC address, but it is odd that it would come up as "Desktop" and be a TP-Link MAC. Try disabling wireless all together on the laptop and see if the MAC address goes away after a reboot. Preferably disable with the wireless off button on the PC if it has one.

It seems like the DIR-615 is bridged and is passing request for a IP direct from the PC to the TP-Link. Make sure the ethernet from the D-link's WAN/Internet port is going to one of the LAN ports on the TP-Link. If it already is, and wireless is disabled and it's still there, then we can try to ping the IP assigned to the odd MAC and see what it actually is.

PS. To look up MAC addresses. see here.

[FurryNutz]

I'm also wondering if were seeing some kind of handshake issue with the ISP service and router. I've seen this on some older model routers were bringing online a router and getting it all connected, the DHCP server starts however the WAN port fails to get a IP address from my modem. I have to power cycle the modem to get the WAN port to gain the ISP IP address. Not sure what causes this. I presume something between the modem and router is hung up and power cycling the modem clears it. Just one thought.

[mads920d]

@Furry, don't see any WAN MAC address on the DIR's status page https://ibb.co/e0UwbF

[FurryNutz]

First line under Internet section(WAN)
Thats the MAC address for the WAN Port. Seems different from the sticker on the bottom. 

@Furry, don't see any WAN MAC address on the DIR's status page https://ibb.co/e0UwbF

[mads920d]

DIR-615 shows this MAC address for LAN: 00:26:5a:ac:6c:88 and for wireless:  00:26:5a:ac:6c:89  <-- This is the WAN and LAN MAC of the DIR-615

DIR-615 DHCP client list: DESKTOP-QAFPST4 F8:A9:63:88:A2:82  <--- This is your computer

TP Link status page shows this MAC address for LAN: MAC Address: 84-16-F9-AE-A8-6C <--- This is a TP-Link WAN MAC. It is show on TP-Link status page

TP Link DHCP client list:

1   DESKTOP-QAFPST4   EC-08-6B-19-8F-46 <----- This is TP-Link MAC address.
3   DIR-615   00-26-5A-AC-6C-89  <--- This is Dlink's WAN MAC address.

So, first thing I notice is the two DHCP client lists mention my PC with different MAC addresses. Why? Second thing I notice is... the wireless MAC address in the DIR-615 status page is the exact same one as listed for the DIR-615 in the TP Link's DHCP client list...

See my edits above for explanation.

I agree the MAC EC-08-6B-19-8F-46  is unusual. Could it be the MAC address of your laptop's wireless adapter? It would make sense that your laptop's ethernet and wireless adapter would have different MAC address, but it is odd that it would come up as "Desktop" and be a TP-Link MAC. Try disabling wireless all together on the laptop and see if the MAC address goes away after a reboot. Preferably disable with the wireless off button on the PC if it has one.

It seems like the DIR-615 is bridged and is passing request for a IP direct from the PC to the TP-Link. Make sure the ethernet from the D-link's WAN/Internet port is going to one of the LAN ports on the TP-Link. If it already is, and wireless is disabled and it's still there, then we can try to ping the IP assigned to the odd MAC and see what it actually is.

PS. To look up MAC addresses. see here.

You are right, just checked and it was my wireless adapter.

[FurryNutz]

:88 is the WAN MAC address seen on the status page under Internet. :89 is the LAN MAC address.

[mads920d]

First line under Internet section(WAN)
Thats the MAC address for the WAN Port. Seems different from the sticker on the bottom. 

@Furry, don't see any WAN MAC address on the DIR's status page https://ibb.co/e0UwbF

The difference is 88 at the end on the sticker and 89 at the end on the web page

[Hard Harry]

. I presume something between the modem and router is hung up and power cycling the modem clears it. Just one thought.

Keep in mind OP does not have a modem. It looks like fiber ONT in the complex with ethernet to each apartment. There is nothing they have access to except the TP-Link and Dlink routers to reboot. I did DOCSIS Tier 1 troubleshooting for a US ISP for 5 years so I fall into that habit many times myself, so FYI.

[FurryNutz]

88 is seen on the UI status page as well...MAC ID on sticker differs I believe from what seen on the status page:
http://forums.dlink.com/index.php?topic=66562.60

Is this the sticker from your router?

[mads920d]

:88 is the WAN MAC address seen on the status page under Internet. :89 is the LAN MAC address.

But it says 88 for LAN and 89 for WAN on the status page. Sticker says 88. So isn't it wrong?

[FurryNutz]

Ya I know. I presume that if the ONT was power cycled, that maybe the 615 would get something. I know it can't be. Well if the 615 is setting a IP address from the TPLink on it's wan port. I presume there maybe a handshake issue between the 615 and ONT.

We have to remember that the 615 is 100Mb connect rate on the WAN and LAN ports, the ONT may be supporting 1000Mb only. Is this TPLink 1000Mb supporting on it's WAN port? Could be a possible issue here. One test to try, Do this to the 616 while connected to the ISP wall out let and see if the ISP IP address comes thru on this PC. Turning a router into an AP.

. I presume something between the modem and router is hung up and power cycling the modem clears it. Just one thought.

Keep in mind OP does not have a modem. It looks like fiber ONT in the complex with ethernet to each apartment. There is nothing they have access to except the TP-Link and Dlink routers to reboot. I did DOCSIS Tier 1 troubleshooting for a US ISP for 5 years so I fall into that habit many times myself, so FYI.

[FurryNutz]

Disregard this. This wasn't your picture you posted. Rather Harrys.

Can you post a picture of the sticker that under your router please?

I see B0 listed on the sticker in your picture? Confirm this is the picture of your sticker under the 615 router.
http://forums.dlink.com/index.php?topic=66562.60

:88 is the WAN MAC address seen on the status page under Internet. :89 is the LAN MAC address.

But it says 88 for LAN and 89 for WAN on the status page. Sticker says 88. So isn't it wrong?

[Hard Harry]

::edit:: The DIR-615 would technically have 3 MAC access, 88 for LAN which is for the internal switch, 89 for the WAN port, and another one for WLAN. It's possible the WLAN MAC isn't being shown because you only need that for WDS or wireless repeating.

"But it says 88 for LAN and 89 for WAN on the status page. Sticker says 88. So isn't it wrong?"

Yes, that does sound wrong. Can you change the MAC address on the status page to 88?

[Hard Harry]

I think it would be better if I take a break for a bit and let you troubleshoot with Furry so I don't distract things. I feel we are VERY close to some kind of outcome, even if it isn't a solution. Feels like we are just missing one obvious thing. I will chew on it while you two troubleshoot and post again later. Good luck!

[FurryNutz]

Your right.

88 is LAN and 89 is WAN. Wifi maybe piggy backing off the LAN MAC. I seen this on some low end model router. I believe the wifi and LAN should be separate MACs generally and are on newer and more high end routers. So 3 MACs should be seen.