Internet very slow after Sky hub replaced by TP-Link

Hi all,
I bought a replacement for the Sky hub (SR101) on ADSL2+ in the form of a TP-Link TD-W8968.
I extracted the username and password from the Sky hub and connected successfully with the TP-Link.
The downstream rate jumped from 4998Kbps to 6023Kbps and it says the internet status is up.
Connecting to any website is extremely slow (as in, unusable). This is the same on both wired and WIFI (PC and smartphone do the same).
Outlook, IE and Chrome are all affected.

I plugged the Sky hub back in and speeds went back to normal.
I factory reset the TP-Link and tried again. Same outcome.
It seems as though the TP-Link is causing a bottleneck but I don�t know why or how to fix it.

Here are some settings from the devices in case they help:

SKY HUB
Connection Speed D: 4998 kbps; U: 1023 kbps
Line Attenuation D: 48.5 dB; U: 26.9 dB
Noise Margin D: 8.3 dB; U: 6.6 dB
Connection Type: PPPoA

Obviously the TP-Link offers a few more settings:

TP-LINK
Connection Speed D: 6023 kbps; U: 1023 kbps
Line Attenuation see below
Noise Margin see below

WAN Type: ATM WAN
Layer2 Interface: atm1(0/38)
Connection Type: PPPoA
Interface atm0 / atm1
Vpi 8 / 0
Vci 35 / 38
Link Type EoA / PPPoA
Encapsulation LLC / VC/MUX
Category UBR / UBR
Conn Mode VlanMuxMode / DefaultMode
IP QoS Enabled / Enabled
Sched Alg WRR / WRR
Queue Weight 1 / 1
Group Precedence 8 / 8

This is the data after about 10 minutes of uptime:
FIRST NUMBER IS DOWNSTREAM, SECOND IS UPSTREAM.

Line Coding(Trellis): On On
SNR Margin (0.1 dB): 63 68
Attenuation (0.1 dB): 495 263
Output Power (0.1 dBm):192 122
Attainable Rate (Kbps): 6,420 934
Rate (Kbps): 5,742 1,023
MSGc (# of bytes in overhead channel message): 65530 14
B (# of bytes in Mux Data Frame): 245 13
M (# of Mux Data Frames in FEC Data Frame): 1 16
T (Mux Data Frames over sync bytes): 0 7
R (# of check bytes in FEC Data Frame): 6 16
S (ratio of FEC over PMD Data Frame length): 1.4769 7.5
L (# of bits in PMD Data Frame): 1365 256
D (interleaver depth): 1 8
Delay (msec): 0 15
INP (DMT symbol): 26 2
Super Frames: 0 0
Super Frame Errors: 1,044 0
RS Words: 2,830,732 557,044
RS Correctable Errors: 13,024 6
RS Uncorrectable Errors: 0 0
HEC Errors: 0 0
OCD Errors: 0 0
LCD Errors: 0 0
Total Cells: 13,644,396 2,512,408
Data Cells: 52,200 17,854
Bit Errors: 0 0
Total ES: 643 0
Total SES: 0 0
Total UAS: 51 51


Pings from command prompt on the PC:

Pinging GOOGLE.COM [2.127.252.152] with 32 bytes of data:
Reply from 2.127.252.152: bytes=32 time=27ms TTL=61
Reply from 2.127.252.152: bytes=32 time=27ms TTL=61
Reply from 2.127.252.152: bytes=32 time=27ms TTL=61
Reply from 2.127.252.152: bytes=32 time=27ms TTL=61
Ping statistics for 2.127.252.152:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 27ms, Maximum = 27ms, Average = 27ms

Pinging BBC.CO.UK [212.58.244.20] with 32 bytes of data:
Reply from 212.58.244.20: bytes=32 time=31ms TTL=56
Reply from 212.58.244.20: bytes=32 time=32ms TTL=56
Reply from 212.58.244.20: bytes=32 time=28ms TTL=56
Reply from 212.58.244.20: bytes=32 time=27ms TTL=56
Ping statistics for 212.58.244.20:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 27ms, Maximum = 32ms, Average = 29ms

Pinging FACEBOOK.COM [173.252.120.6] with 32 bytes of data:
Reply from 173.252.120.6: bytes=32 time=116ms TTL=84
Reply from 173.252.120.6: bytes=32 time=124ms TTL=84
Reply from 173.252.120.6: bytes=32 time=115ms TTL=84
Reply from 173.252.120.6: bytes=32 time=116ms TTL=84
Ping statistics for 173.252.120.6:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 115ms, Maximum = 124ms, Average = 117ms

Thanks in advance for any help anyone can offer!

Regards,
Steve

WAN Type: ATM WAN
Layer2 Interface: atm1(0/38)
Connection Type: PPPoA
Interface atm0 / atm1
Vpi 8 / 0
Vci 35 / 38

Looks odd, why running two interfaces? Should just be the one using 0/38 VPI/VCI values.

Pings look OK and sync not unreasonable for the line length. Got a link to a speed test result e.g. http://www.thinkbroadband.com/speedtest

Thanks;
I was wondering about the two interfaces but then assumed the atm0 is the 3G share so ignored it. Do you think it's worth deleting it?

I can't even get onto the website to run the test...

When I've had routers with 3G option via USB only shows up if I configure it.

When you factory reset does it always have one interface configured? If yes, what I would be doing is reconfiguring that to meet the settings I want, rather than adding another interface.

Hi again,
I reset the router and it created that odd atm0 interface automatically, so I removed all traces and set up the connection from scratch (it would not let me edit it).

The problem persists, however something odd that has occurred is Facebook.com loads quickly whereas all other sites tried seem to connect but not load the pages. The speedtest page connected but then tried to load for over 5 minutes with no joy.

I have verified the settings against the Sky hub.
The Default gateway matches.
The DNS servers match.
The Sky hub shows a different "Broadband Port IPv4" address to the "IPv4 WAN IP Address" in "Internet Info" on the TP-Link. - Does this matter?

I noticed this in the maintenance page too:

Test the connection to your Internet service provider
Test PPP server session: PASS 
Test authentication with ISP: PASS 
Test the assigned IP address: PASS
Ping default gateway: FAIL
Ping primary Domain Name Server: FAIL

Test the connection to your DSL service provider
Test ADSL Synchronization: PASS 
Test ATM OAM F5 end-to-end ping: PASS 


Thanks again,

Edited by beercan (Sun 26-Jul-15 13:29:15)

Try using google dns servers maybe

MTU?

I've suggested MTU size to the OP Andrew. Is MER of any relevance here? I know virtually nothing about it.

MER probably not as adsl2+ Sky is happy with pppoa usually

Hi again,
Thanks for your efforts in trying to fix this.
I have checked the MTU which was at 1480. I also tried it at 1450 and 1500 (which is what the Sky hub has it as). No difference was visible.

I also tried the Google DNS servers but no change.

The Sky hub is set to PPPoA not MER, and I configured the TP-Link the same.

I believe from what I've read that MER is only for fibre on Sky, and PPPoA is for ADSL.

Regards,