Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17


Will increasing MTU size the speed?

Posted on 2009-04-02
Medium Priority
Last Modified: 2013-11-09
Hi Experts

Will increasing MTU size the speedup my broadband(PPPoE) speeds?

If Yes, How to do that ?

If No, Why can't?

OS: Windows XP Professional SP2
Question by:VINOD MORE
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2

Expert Comment

ID: 24047504

Author Comment

ID: 24047527
@ peter41

Thanks for settings, but will that increase the speed?

Slight confusion should I low down or increase the MTU size? to speedup?
LVL 68

Accepted Solution

woolmilkporc earned 1000 total points
ID: 24047647
for PPOE the maximum recommended MTU size is 1492. 1500 is normally the max size for internet connections - use 1492 to allow for the 8 bytes PPOE "wrapper".
Increasing MTU size will allow for more speed, as long as the maximum value any connection in the whole path can handle is not exceeded. In that case it will come to fragmentation, which will have an adverse effect on speed. That's because fragmenting packets at the sender's side and re-assembling them at the target will be time-consuming.
Setting MTU in XP requires editing the registry -

In the right-panel, create a new DWORD named MTU with the new value.
You can try to find a good MTU size by using ping with the -f (don't fragment) option and with -l [MTU size] set to different values.
Learn how to optimize MySQL for your business need

With the increasing importance of apps & networks in both business & personal interconnections, perfor. has become one of the key metrics of successful communication. This ebook is a hands-on business-case-driven guide to understanding MySQL query parameter tuning & database perf


Author Comment

ID: 24047864

Pinging with 32 bytes of data:

Reply from bytes=32 time<1ms TTL=64
Reply from bytes=32 time<1ms TTL=64
Reply from bytes=32 time<1ms TTL=64
Reply from bytes=32 time<1ms TTL=64

Ping statistics for
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

OK i got this replay when i pinged the gateway?
What settings should i make in MTU size?
LVL 68

Assisted Solution

woolmilkporc earned 1000 total points
ID: 24048012
As I wrote,
to experiment with MTU sizes, use the -f and -l flags of ping -
Start e.g. with
ping -f -l 1492 [target]
If you see a message saying that fragmentation was required, but the DF flag was set, the chosen MTU size is too big. Decrease it, until you find a size which will pass without an error. This is the maximal unfragmented (and probably optimal) MTU size for that particular connection.

Author Closing Comment

ID: 31565678

Featured Post

Introducing the WatchGuard 420 Access Point

WatchGuard's newest access point includes an 802.11ac Wave 2 chipset, providing the fastest speeds for VoIP, video and music streaming, and large data file transfers. Additionally, enjoy the benefits of strong security as the 3rd radio delivers dedicated WIPS protection!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When posting a question about a Cisco ASA, Cisco Router or Cisco Switch, it can aid diagnosis if a suitably sanitised copy of the config is provided. It is much better to leave as much of the configuration as original as possible, as it could be tha…
This article provides a convenient collection of links to Microsoft provided Security Patches for operating systems that have reached their End of Life support cycle. Included operating systems covered by this article are Windows XP,  Windows Server…
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …

670 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question