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How-to Fix vDSL connection issues- Update
on 8 August 2014
Important update, please read below
I have owned this router for over a week and been having a hell of a time with the DSL ping and speed. I search everywhere online on how to resolve x2 higher ping (from 15ms to 30ms) without success. Firstly you must remember that any new router will face the dreaded DLM ( Dynamic Line Management - https://ttb.custhelp.com/app/answers/detail/a_id/651/~/dlm-%28dynamic-line-management%29 ) that can last week(s) finding the optimum speed. But anyway, here are the things to help.
Here's how to improve speed and decrease ping:
1. Update firmware
2. [wireless] settings
a) Disable [WPS] (security risks)
b) 2.4 GHz
i) Disable [b/g Protection]
ii) Set [Channel bandwidth] to [20 mhz]
iii) Set [Control Channel] to one of [1, 6, 11]
c) 5 GHz (Dont touch)
3. [WAN] settings
a) Disable [uPNP] (security risks)
b) Set [Connect to DNS Server automatically?] to [no] and add [220.127.116.11] and [18.104.22.168] to DNS Server 1 and 2 (Google Public DNS).
c) !important part! Set [MTU] to  and [TCP MSS Option] to  (Improve ping and connection speed).
4. [Advanced] settings, select [DSL Setting] tab
a) Set [DSL Modulation] to [VDSL2] (vDSL line)
b) Set [Rx AGC GAIN Adjustment (VDSL)] to [performance].
I couldn't be more than happier now, extremely fast and great WiFi range/speed! Good luck!
Unfortunately I've found my vDSL connection dropping again and with the recent DLM effects my connection speed has dropped from 48Mbps to 20Mps. Looked at Asus wireless forum and it seems others are experiencing the same. Follow [vdslhelp] posts, I'm hoping my DSL speeds return to normal. It seems the DSL-N66U isn't ready for vDSL yet, due to firmware issues..?
When the DSL-N66U had a connection, the download/upload speed were slightly faster. The upload had increased from 12Mbps to 16Mbps, but my ping had increased from 15 to 30 back to 20 in addition to this I was experiencing a lot more CRC errors.