Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




318 posts

Ultimate Geek

Trusted

#138657 12-Jan-2014 17:50
Send private message

I have a TP-LINK TD-W8980 w. firmware 0.6.0 1.3 v000e.0 Build 131012 Rel.51720n connected to Telecom NZ ADSL2+. The TP-LINK TD-W8980 has Telepermit PTC 273/13/020.  (I do understand existence of a Telepermit confirms only suitability to connect to the Telecom network and does not confirm all protocol features except it does imply basic functionality in regard to connection.)

The currently recommended MTU to connect to Telecom ADSL2+ is 1500. The TD-W8980 will not save an MTU value for PPPoA greater than 1492. I understand that with MSS-clamping, this issue may not affect TCP, but may negatively impact other protocols such as UDP.

Mercutio reported a similar issue with the TD-W8970, and earlier with the TD-W8960; Mercutio reported that TP-LINK did fix the TD-W8960.

I have reported the issue to TP-LINK and their reply includes: "... I confirmed with our R&D person, they claimed that apart from the first 8 PPP digits data, 1492 is the largest MTU we can set. And it is not likely to be able to set it to the value of 1500 in the next firmware ..."

So is TP-LINK implying that the "effective" MTU is 1492+8, ie 1500?

Whatever, it seems one should be reserved about choosing a TP-LINK TD-W8980 to connect to Telecom ADSL2+ until TP-LINK fixes the firmware to allow the Telecom NZ recommended PPPoA MTU to be set. It seems to be a matter that TP-LINK should have been on top of since at least their TD-W8960 model.

Create new topic
8035 posts

Uber Geek

Trusted

  #966112 13-Jan-2014 12:49
Send private message

Are you having a actual problem with the MTU at 1492?

3065 posts

Uber Geek


  #966128 13-Jan-2014 13:12
Send private message

<So is TP-LINK implying that the "effective" MTU is 1492+8, ie 1500? >

I would expect the answer is yes.

You can check if you have any real problem using this info:
http://www.tp-link.com/en/article/?faqid=190

In fact its a nice little bit of tuning.... 




Nothing is impossible for the man who doesn't have to do it himself - A. H. Weiler


 
 
 
 


8035 posts

Uber Geek

Trusted

  #966282 13-Jan-2014 16:04
Send private message

robjg63: 

You can check if you have any real problem using this info:
http://www.tp-link.com/en/article/?faqid=190

In fact its a nice little bit of tuning.... 


You might find an ideal MTU for one route to one site but the internet isn't just one route to one site...

3065 posts

Uber Geek


  #966313 13-Jan-2014 17:06
Send private message

Dont all the packets come via your ISP?
Wouldnt be the first time I was wrong....but I thought the MTU settings were between you and your ISP.




Nothing is impossible for the man who doesn't have to do it himself - A. H. Weiler


8035 posts

Uber Geek

Trusted

  #966896 14-Jan-2014 15:37
Send private message

robjg63: Dont all the packets come via your ISP?
Wouldnt be the first time I was wrong....but I thought the MTU settings were between you and your ISP.


Your modem talks to the dslam/isam via ATM, then PPPoA (or PPPoE) works over the top of that connection, then the backhaul from the dslam/isam to your ISP's BRAS is likely Ethernet... it's layer upon layer.

From your ISP onwards every hop in the route to somewhere (eg: a website) also has a MTU limit/size. MTU path discovery is supposed to work out the minimum in the route for each connection but ICMP is often dropped or ignored by routers these days.

Long story short in practice you shouldn't see a noticeable difference between 1492 set in your modem/router because it's less than the Ethernet limit of 1500.












318 posts

Ultimate Geek

Trusted

  #1106115 10-Aug-2014 23:06
Send private message

lapimate:... The TD-W8980 will not save an MTU value for PPPoA greater than 1492. ...
TP-LINK have released new firmware TD-W8980_V1_140619 which allows a PPPoA MTU range of 576-1500.

Create new topic



Twitter and LinkedIn »



Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

OPPO Find X2 Lite brings flagship features to mid-range 5G smartphone
Posted 29-May-2020 12:52


Sony introduces the digital camera ZV-1 for content creators
Posted 27-May-2020 12:47


Samsung Announces 2020 QLED TV Range
Posted 20-May-2020 16:29


D-Link A/NZ launches AI-Powered body temperature measuring system
Posted 20-May-2020 16:22


NortonLifeLock Online Banking Protection now available for New Zealand banks
Posted 20-May-2020 16:14


SD Express delivers new gigabyte speeds for SD memory cards
Posted 20-May-2020 15:00


D-Link A/NZ launches Nuclias cloud managed network solution hosted in Australia
Posted 11-May-2020 17:53


Logitech introduces new video streaming solution for home studios
Posted 11-May-2020 17:48


Next generation Volvo cars to be powered by Luminar LiDAR technology
Posted 7-May-2020 13:56


D-Link A/NZ launches Wi-Fi Certified EasyMesh system
Posted 7-May-2020 13:51


Spark teams up with Microsoft to bring Xbox All Access to New Zealand
Posted 7-May-2020 13:01


Microsoft plans to establish its first datacenter region in New Zealand
Posted 6-May-2020 11:35


Genesis School-gen has joined forces with Mind Lab Kids
Posted 1-May-2020 12:53


Malwarebytes expands into privacy with fast, frictionless VPN
Posted 30-Apr-2020 16:06


Kordia to donate TV airtime on Channel 200 to community groups
Posted 30-Apr-2020 16:00



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.