Significant speed drops since moving from M350 to M500

[CJS23]

Hi. I would always get around 370mbps down and 38mbps up when on M350. Since migrating to M500 , I now struggle to get 300mbps down and 32mbps up. No equipment or settings changes. Same Hub 3 in MODEM mode with same RT-AC87U. Powered all equipment off, back on etc. Ethernet connection (CAT 6A full duplex). Could someone look over my stats below and advise, please? Cheers. Chris

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Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1	331000000	7	40	256 qam	25
2	203000000	8	38	256 qam	9
3	211000000	7.9	38	256 qam	10
4	219000000	7.1	38	256 qam	11
5	227000000	7	38	256 qam	12
6	235000000	6.3	38	256 qam	13
7	243000000	5.9	38	256 qam	14
8	251000000	5	38	256 qam	15
9	259000000	5.5	38	256 qam	16
10	267000000	6.3	38	256 qam	17
11	275000000	6.8	38	256 qam	18
12	283000000	6.6	38	256 qam	19
13	291000000	6.9	38	256 qam	20
14	299000000	7	38	256 qam	21
15	307000000	7.3	38	256 qam	22
16	315000000	7	40	256 qam	23
17	323000000	6.9	38	256 qam	24
18	371000000	6.8	40	256 qam	26
19	379000000	6.6	38	256 qam	27
20	387000000	6.1	40	256 qam	28
21	395000000	5.6	38	256 qam	29
22	403000000	4.8	38	256 qam	30
23	411000000	4.5	38	256 qam	31
24	419000000	4	38	256 qam	32

Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1	Locked	40.3	83	7101
2	Locked	38.9	118	7280
3	Locked	38.9	145	8502
4	Locked	38.9	186	8837
5	Locked	38.9	348	7802
6	Locked	38.9	318	8378
7	Locked	38.6	579	7479
8	Locked	38.6	818	7769
9	Locked	38.6	778	7358
10	Locked	38.9	241	7836
11	Locked	38.9	143	7736
12	Locked	38.9	141	8310
13	Locked	38.9	154	7630
14	Locked	38.6	262	7356
15	Locked	38.9	168	7913
16	Locked	40.3	176	7361
17	Locked	38.9	198	7831
18	Locked	40.3	97	8333
19	Locked	38.9	119	7507
20	Locked	40.3	170	8273
21	Locked	38.9	314	8232
22	Locked	38.9	593	8121
23	Locked	38.9	1037	8147
24	Locked	38.9	642	7794

Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

1	60300036	41.3	5120	64 qam	1
2	39400019	37.8	5120	64 qam	4
3	46199986	38.8	5120	64 qam	3
4	53700017	41.3	5120	64 qam	2

Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	ATDMA	0	0	3	0
2	ATDMA	0	0	0	0
3	ATDMA	0	0	2	0
4	ATDMA	0	0	1	0

[legacy1]

Connect a PC to the hub in modem mode without a router and do a speed test.

[CJS23]

Hi Alessandro , cheers for the rapid response. I did what you suggested but had to power cycle the Hub 3 to get an IP. Once I did, 517mbps!! But. And it's a big but. My router could then NOT get an IP either so I duly power cycled the MODEM and sadly back to 300mbps. When I look at my https://beta.speedtest.net/results page, I noted that my WAN IP changed only that one time since 29/12/2020 . In other words, I've had the same WAN IP since 29/12/2020 and have noted degradation ("laggy") , increased ping, jitter and bufferfloat over the past few months. By some fluke, when I power cycled to do your suggested test, I got that one time WAN IP and BOOM - the actual service I'm paying for. Could this be what I would call contention i.e. heavy usage? My area ref is 30. How can I get that magic WAN IP range back again!?On the magic WAN IPPoor latency and jitterPower cycle and on BAU IPOn BAU IP

[legacy1]

You can use MAC clone option in your RT-AC87U to get the other WAN IP but the RT-AC87U could be slowing you down are you using stock firmware? QoS disabled?

[CJS23]

Ah! 😀 Ref the MAC clone option. Do you mean use the Hub 3's MAC? QoS is off, I was only client on my LAN when testing and I use the latest Merlin firmware as he no longer develops for the RT-AC87U which is 384.13_10

[legacy1]

Try use the MAC of the PC that gave you good speed.

You might find that Asus firmware to be faster will hardware offload NAT

[CJS23]

OK, using the MAC of the laptop which hit the 500mbps wired direct to the Hub 3 in MODEM mode earlier (I had to power cycle the Hub 3 for the RT_AC87U to pick up a WAN IP) , it's now . . . . 

Struggling to understand what's happening here as now have a 3rd and different WAN IP altogether, lol

[Andrew-G]

Power cycling the hub (including switching mode) causes it to renegotiate all channels, and that's probably the cause of speed improving, and nothing to do with modem mode.  Looking at your hub stats, the downstream power range looked suspiciously wide, there were a good score of post-RS (uncorrectable) errors that will affect speed, and there were a few upstream timeouts that are often associated with brief disconnects.

Unless the conditions that caused the connection to deteriorate have been fixed, it will "drift off" again, and you can connect whatever router you want without improving that situation.

[legacy1]

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@CJS23 wrote: 

Struggling to understand what's happening here as now have a 3rd and different WAN IP altogether, lol

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Yes I call it a bug on VM DHCP server your PC sends like more options gives you one WAN IP then the RT_AC87U does giving you another WAN IP under the same MAC.

Find another MAC you own and put that in the router and see what you get.

and try Asus firmware

[CJS23]

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@legacy1 wrote:

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@CJS23 wrote: 

Struggling to understand what's happening here as now have a 3rd and different WAN IP altogether, lol

---

Yes I call it a bug on VM DHCP server your PC sends like more options gives you one WAN IP then the RT_AC87U does giving you another WAN IP under the same MAC.

Find another MAC you own and put that in the router and see what you get.

and try Asus firmware

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Hi. I'm trying the different MACs aspect but struggling to see why Merlin FW would be an issue, tbh. It's been flawless for me and gave me way above the 500mbps/35mbps when on that one time WAN IP which got issued and then never came back lol