Recent Posts



« | Main | »

Wireless Performance Issues with Vista/Windows7 and the ReadyNAS

By dbott | September 20, 2009

There are a number of users of Microsoft Vista and Windows 7 that have issues when trying to access their ReadyNAS Duo and NV+ devices over a wireless connection. When Vista was first released, there were wide-spread complaints about Vista’s performance and all sorts of tips and tweaks on how to disable auto-tuning.  Since the release of Service Pack 1, most of  these problems have disappeared.

Even with Vista SP1, some ReadyNAS owners are finding the read performance to be excruciatingly slow when using Vista over a wireless connection.  From my experience, it seems to be a combination of Vista and the type of wireless chipset (which is tied to the driver), as not every laptop running Vista has this issue.

It’s also interesting to note that the same hardware running Windows XP or Linux does not experience performance problems, nor does every computer running Vista.  For example, my wife’s Lenovo Thinkpad running Vista with Intel wireless N card does not exhibit this behaviour, but my dad’s Dell running Vista with Broadcom wireless G does.  My Dell laptop running XP and wireless G does not exhibit this behaviour.

Under normal circumstances, changing the MTU on the NAS to a lower number should force Vista to auto-adjust it’s MTU, but it does not seem to work as expected and is detailed here:

… even though MTU of 1430 is set for best performance on my router, Vista still has the default windows setting of 1500 on both the wireless and ethernet network cards – this is despite the auto tuning feature that is supposed to automatically adjust the MTU figure.

I have found that setting the MTU to 1430 for the wireless card on the Vista laptop to be very effective at resolving the performance issues when reading and writing to the ReadyNAS.  This allows the NAS to leave the MTU at it’s default setting of 1500 for optimized performance with other clients.

This work-around is based upon the tutorial provided by the folks at and modified for users of the ReadyNAS (as well as to preserve the information in the event this information is removed from their site).

Fixing the Problem:

  1. First, make sure that you’re running SP1.
  2. In Vista, open an administrative command prompt:

    Vista Administrative Command Prompt

    Vista Administrative Command Prompt

  3. Next, we need to find out the name of our wireless connection.  At the command prompt type:
    netsh interface ipv4 show subinterfaces

    You should see something like this:

    Vista Network Connection Names

    Vista Network Connection Names

    In the example above the interface name is Wireless Network Connection and the MTU is currently set to 1500.  Make note of the interface name.

  4. At the command prompt type the following command:
    netsh interface ipv4 set subinterface "Wireless Network Connection" mtu=1430 store=persistent
    Setting the MTU in Vista

    Setting the MTU in Vista

  5. At this point, you should be a reboot away from normal expected wireless performance (around 2-3 MB/s for 802.11g connections).
  6. Make sure the MTU on the ReadyNAS is set at it’s default value of 1500.  In Frontview, go to Network > Interfaces > MTU and verify that it’s set to 1500.

If this does not work for you, try adjust the MTU in Vista to 1460 and/or 1492.

Other useful tips when working with Vista from the ReadyNAS FAQ:

Slow Wired Performance with Vista / Windows 7:

Slow access over 10/100/1000 wired connections. The ReadyNAS employs an aggressive hardware acceleration for optimum throughput, however some wireless routers, wireless adapters, and 10/100 routers are unable to handle this acceleration. Try setting the MTU on the ReadyNAS to 1492 to disable this aggressive mode.

Topics: ReadyNAS, Tech | 46 Comments »

46 Responses to “Wireless Performance Issues with Vista/Windows7 and the ReadyNAS”

  1. MalteP Says:
    October 4th, 2009 at 5:31 pm

    Wow..incredible performance improvement. I have been struggling with Vista / ReadyNAS for a while now… and extremly bad performane. This article just saved my day. Thanks !!!

  2. dbott Says:
    October 12th, 2009 at 7:22 pm

    Another forum member (CRS_H) posted about a possible issue with wireless N here:

  3. dbott Says:
    October 13th, 2009 at 9:09 am

    As far as I can tell, the optimal settings are:

    NV+/Duo Settings:
    MTU on NV+/Duo: 1500
    Jumbo Frames: OFF
    Speed/Duplex Mode: Auto-negotiation*

    *Some 10/100 routers don’t auto-negotiate very well, so if your wired speed are low, try adjusting this setting to 100 Mb Full-Duplex or 100 Mb half-duplex

    Vista Settings:
    MTU on Vista wifi adapter: 1430
    MTU on Vista wired adapter: 1500

    After making the necessary changes, be sure to reboot both devices to makes sure the settings are in effect.

  4. gleapman Says:
    January 3rd, 2010 at 2:52 am

    Thank you. Thank you. Thank you.

    Upgraded an HP nc8430 notebook from XP to Windows 7 (64-bit) a few days ago. Accessing the Readynas Duo and hard drives on other computers on our home network when wireless was quick when using XP. After the upgrade, it could take a minute to open a 1mb jpg stored elsewhere on the network. Same problem with Word documents and other files. After setting the MTU to 1430 by following your instructions, things are back to normal.

  5. evo678 Says:
    January 10th, 2010 at 6:32 am

    I’m having these problems but with Windows 7 Ultimate 32-bit version. I’ve tried the suggested changes to the MTU figure bo so far to no avail (though I have only been re-booting the PC, not the ReadyNAS, which I will now try).

    At the moment, I’m stuck, can’t copy anything to the NAS without file failures happening.

    Any further suggestions very welcome

  6. Unofficial ReadyNAS Getting Started Guide | The Bott Blog Says:
    February 2nd, 2010 at 12:59 pm

    […] Wireless Performance Issues with Vista and the ReadyNAS […]

  7. colinp Says:
    March 10th, 2010 at 2:03 pm

    I had the same issue with Readynas Duo and Windows 7 Home Premium.
    Simply setting MTU on netbook to 1430 as your instructions solved it.

  8. johnrcrellin Says:
    April 18th, 2010 at 7:29 am

    Just fixed my Lenovo Laptop – was really getting frustrated that my home network strategy wasn’t working out after buying it ! Now have iTunes fine on it and you can browse images on the NAS etc.

    Brilliant !

    But why have Microsoft not fixed this yet even in W 7 ???

  9. Thomas Says:
    April 25th, 2010 at 2:02 pm

    Hi Want to say thanks a LOT, This fix` my poor speed from my HTPC with Wire to the nas box. I had about 200KB/S without this setting… now i have 11MB/S…

    You saved my day… now its movie time :)

  10. ReadyNAS Performance Expectations | The Bott Blog Says:
    May 15th, 2010 at 9:34 pm

    […] Wireless Performance Issues with Vista and the ReadyNAS […]

  11. Thor Says:
    June 11th, 2010 at 4:14 am

    Hi! Thanks! I set my MTU to 1430. I now have 3 Mb/s. :)

  12. Niklas Says:
    June 25th, 2010 at 4:44 pm

    Phfew. This saved me from a very big disappointment with my new hardware. Although I must say not a very user friendly fix needed for fairly basic functionality. But, I guess it is not an ipad…

  13. John Says:
    July 1st, 2010 at 6:16 pm

    Thank you! This was great.

  14. Evil Overlord Says:
    July 2nd, 2010 at 12:48 pm

    Similar problem as some above – VERY slow file transfer with Lenovo x200s, Windows 7 Pro 32, and ReadyNAS NV+. Couldn’t get your solution to work – see *2 below

    Solutions attempted
    I have tried the following solutions:
    *1 Mapping NAS B shares to a network drive using IP address rather than DNS.
    No visible improvement.
    *2 Command line: “netsh interface ipv4 show subinterfaces”, to see MTU preparatory to resetting it to 1430 (or 1460 or 1492).
    Command not found. True whether I run the command as administrator or regular. Some suggest this only works in Vista.
    *3 Setting “oplocks” on for the relevant share in NAS Frontview |Network |Performance
    No visible improvement.
    *4 Running IOMeter as described in -5 above.
    laptop A Read 1.72, Read 1.07 MB/s
    laptop D Read .04, Write .84 MB/s
    Vastly lower than the ReadyNAS results, so perhaps I’m doing something wrong. But D results still far lower than A.

    Solutions not attempted
    !1 I have not tried Radiator 4.1.7 beta, though some suggest this may help.
    I’m not keen to risk essential data (even backed up) on a beta.
    !2 Some solutions suggest installing and messing with Samba.
    That is far beyond my technical expertise.

  15. dbott Says:
    July 2nd, 2010 at 2:08 pm

    It *should* work. I just tested on both a Windows 7 Pro (32-bit and 64-bit) and it worked as expected:

    64-bit Version of Windows 7 Pro

    Microsoft Windows [Version 6.1.7600]

    C:\Users\admin>netsh interface ipv4 show subinterfaces
    MTU MediaSenseState Bytes In Bytes Out Interface
    ------ --------------- --------- --------- -------------
    4294967295 1 0 23660 Loopback Pseudo-Interface 1
    1500 1 24129245 908280 Local Area Connection

    C:\Users\admin>netsh interface ipv4 show subinterface "Local Area Connection"
    MTU MediaSenseState Bytes In Bytes Out Interface
    ------ --------------- --------- --------- -------------
    1500 1 24131789 909003 Local Area Connection

    32-bit Version of Windows 7 Pro

    C:\Users\dbott>netsh interface ipv4 show subinterfaces

    MTU MediaSenseState Bytes In Bytes Out Interface
    ------ --------------- --------- --------- -------------
    4294967295 1 0 15653002 Loopback Pseudo-Interface 1
    1500 1 5245469969 4303407861 Local Area Connection

    Microsoft Windows [Version 6.1.7600]

  16. Rajnish Says:
    July 2nd, 2010 at 2:46 pm

    ReadyNAS Duo was excrutiatingly slow with my VAIO running Win 7 over wireless (on wired LAN it was OK).

    Setting MTU to 1430 to the Wireless Connection brought back life. MTU is still 1500 on ReadyNAS as well as Wired LAN.


  17. Michel Says:
    July 4th, 2010 at 7:20 am


    i have done this and it works great butt, now i have a new router the WNDR3700 and it is a nice router butt…..
    i have got a Atheros AR928X wifi card in my laptop.
    butt it just go on a/b/g and not on the n standard after a driver update it works great butt not on the Readynas NV+ it is dogslow again, i dit some work with the MTU butt nothing works. i placed the old driver back and it works ok again, on the g standard(2,6 Mb/s) butt i dit not buy the router for this, i need it to work on the n standard.

    Do you have got a tip or trick for this?

    My 2nd option is to buy the WNDA3100 for my laptop but wil it work or not on the n standard?

    kind reagards,


  18. grateful Says:
    July 24th, 2010 at 11:59 am

    Thank you so very much! Lenovo X200 Vista and Toshiba Satellite Vista wireless to ReadNAS Duo running slow (like 4 hours to transfer an albumn). Did your fix and we can use the ReadyNAS Duo the way it was intended.

    Thank you again,

  19. George Spoelstra Says:
    August 3rd, 2010 at 4:22 pm

    You just made my day. I can now work with the unit. before the fix it was extremely frustrating. Unbelievable that Netgear doesn’t provide any help

  20. Greg Tarsa Says:
    August 19th, 2010 at 8:43 pm

    I just upgraded one of my machines to Vista and my GbE (Netgear GS108) network performance is unusably slow on the machine. Most all roads are leading to this page, but I want to know if I change the MTU on the ReadyNAS does it negate the Jumbo Frame performance for my other systems?

    I do not want to degrade performance for my entire network just because Vista doesn’t play well with others.

    Any insight would be appreciated.


  21. dbott Says:
    August 24th, 2010 at 2:56 pm


    This work-around is strictly for wireless issues in Vista/Win7 and does not require modifying the MTU on the NAS (you can leave it at 1500 or with JF on).

    If having issues with wired gigE, then you may want to change the MTU on the NAS to 1492 to see if it helps. Obviously, if other machines are working well with JF on, then they would suffer a performance hit on writing to the NAS, although it may be your only recourse to make Vista perform adequately.

  22. Ian Westwood Says:
    August 26th, 2010 at 1:50 pm

    You sir are a complete genius! Having been banging my head against the wall for the last week or so since trying to setup iTunes on my sons new laptop with Windows 7 64-bit and also transferring my other sons iTunes library to his Vista laptop.

    Performance was PAINFULLY bad, and no matter what I tried, it didn’t work.

    I used your MTU setting of 1430, and the performance is much improved.

    I have a ReadyNAS Duo drive which for my wired connections has been working fine, but the wireless ones were so bad.

    Once again, thanks a lot, you are a life saver!

  23. Daniel Says:
    September 3rd, 2010 at 2:29 am

    Great, after weeks of headache this article solve the issue for Windows 7 and the ReadyNAS!


  24. Nick McEwen Says:
    September 27th, 2010 at 4:09 pm

    THank you so much … I am using a Lenovo SL410 and a ReadyNAS Duo … changing the MTU to 1430 has cured the wifi problems that I’ve been encountering (particularly with iTunes)

  25. Richard Says:
    October 1st, 2010 at 6:02 pm

    Windows 7 Pro. Worked great with my ReadyNAS Duo. Thanks for the Post.

  26. Guenther Says:
    October 9th, 2010 at 3:05 pm

    Thank you so much for this post!

    It saved me from going absolutely insane trying to figure out a solution for this browsing through netgear and microsoft fora. incredible that neither company has yet at least posted a link to your site.

    netgear online support did not seem to know either.

    Again, many thanks. you are a genius!

    win7 home premium 64x, readynas duo

  27. anon Says:
    October 21st, 2010 at 7:50 am

    Thank you for this!

  28. Sebastien Says:
    October 26th, 2010 at 11:30 am

    I have a NVX, D-Link DIR-600 and acer laptop, set MTU to 1430 on the laptop, however maximum download speed is 2 MB/s most of the time it is just 1.5 MB.
    Jumbo frames and adjusting the MTU on the ReadyNAS didn’t help. I use the latest firmware for my readynas and router.
    any other suggestions ?

  29. dbott Says:
    October 26th, 2010 at 11:46 am

    Jumbo frames is only for wired gigabit connections. It does not affect wireless connections. As for your speed, what type of wireless connection do you have (g or n)? A g connection will generally perform between 2-3 Mbps, however, things like distance from router, interference, etc. can reduce performance.

    Have a look at this document for typical performance specs:

  30. kobbi Says:
    November 13th, 2010 at 1:39 pm

    i got it !!!!
    leave it without jumbo frames and dont thach the mtu.
    just select the “Disable journaling option” in the nas i got 22 mb/s

  31. minneapolis computer repair Says:
    November 26th, 2010 at 5:54 am

    Fantastic posting! Lots of good information. Do you mind if I link to you on my website?

  32. Sam Says:
    November 29th, 2010 at 8:18 am

    Wow….. that just fixed it! After screwing around with drivers, enabling and disabling various components, and god knows what else and achieving nothing. Then seeing this and bam! it works! YaY!

  33. George Says:
    December 3rd, 2010 at 4:05 pm

    That worked great for me. I am on Vista with a wireless Linksys router. It was taking 30-40 seconds to retrieve the file info on songs on the NAS via ITunes. After this simple change it’s as fast as local. Thanks for the great, clear post.

  34. Bryan Says:
    December 18th, 2010 at 3:04 pm

    Just seen this post after years of Pain with Vista over wifi.
    Don’t understand what any of it means, but it fixed the problem. VERY HAPPY. THANKS!!

  35. Håkan Says:
    December 28th, 2010 at 11:49 am

    Thanks a lot!

    I had the same problem with my wifes Asus 1101 with Atheros wireless network card (Win 7 32 Home edition) but not with my Dell Precision 6500 (Win 7 64 Ultimate). The reading of photos from my Readynas nv+ (Raidar 4.1.7 MTU 7936) was terrible slow and sometimes it hung. Changing the MTU to 1430 helped.

  36. Kim Says:
    December 30th, 2010 at 4:32 pm

    MTU 1500 > 1430 fixed the wireless problems in our home net using an Fujitsu Amilo with Vista and a Sony Vaio with Windows 7.

  37. perkie Says:
    December 30th, 2010 at 8:12 pm

    Why is it that I am strugling getting an expensive vista laptop to work when both my xbox and my ps3 just switched on, saw the ReadyNas and can play all the files near instantaneously and Windows takes 30 seconds to view one 246k picture!!! Trying all the advice here

  38. Leo Says:
    January 13th, 2011 at 4:17 pm

    Many thanks! It worked with MTU equal to 1460. I use 32-bit Windows 7, Samsung laptop, model Q320.

  39. Pete Says:
    January 28th, 2011 at 6:02 pm

    Hi, Was having same problem and did the MTU, disable jumbo, map to \\nas.19/c and also did a tweak on 7 to disable something that i cant remember now as been trying all kinds, now can move a 1gig file in seconds instead of 15 mins!! But still when i copy the same file to another folder it’s still 15 mins? Reason for two locations for file is just set up bittorrent and downloading file to one place and leaving for mates for a week while i use the copy on my nas for me..
    But thanks so much for this it really helped me!!

  40. Jim Kyle Says:
    January 29th, 2011 at 8:14 am

    WOW…. I am using windows 7 Ultimate on a high end Fujitsu laptop — NAS ReadyDuo — Linksys WAG160n router. I almost gave up on the NAS wireless and went back to using external HDDs. The wireless connection was like beeing back in the 1980s. Set MTU to 1430 and i am now back in the 21st century. POST OF THE YEAR (my opinion)

  41. Diego Says:
    February 6th, 2011 at 1:42 pm

    Thanks, my issue finally resolved, MTU 1430, WIndows 7 64 Bit, Intel 4965 AGN wireless card

  42. Secrets of a Happy NAS « Bessantomics Says:
    February 21st, 2011 at 6:28 pm

    […] the wireless network controller’s MTU to 1430. You can find instructions on how to do this here. Photos now appear in an […]

  43. Eric Says:
    March 11th, 2011 at 10:05 am

    Changed the MTU to 1430 on my Dell Mini running Windows 7 Starter with the Intel 6205 wireless n adapter and the performance to my ReadyNAS Duo drastically increased. Thank you so much. As a side note, my wife’s Dell XPS1330 laptop running Windows 7 Home with the Intel 6205 wireless n adapter did not require the MTU modification. The performance on this laptop was always good. Any thoughts?

    My other question is, will changing the MTU to 1430 or anything other than 1500 change the performance for other wireless activities (i.e. internet, wireless printing, etc)?

    Thanks again!

  44. Ben Turner Says:
    March 28th, 2011 at 7:53 am

    Done this before – but following another more generic guide citing MTU of 1492. Now I’m trying 1430 – my god ! It works !

    Can’t tell you how long I’ve had this problem and cursed windows. I’ve downgraded two PCs to XP precisely to avoid it. Now I can once again consider Windows 7 for my HTPC, knowing it won’t splutter to even load photos over the network !


  45. Redriff Says:
    April 9th, 2011 at 6:27 pm

    F#ck me, i have been thinking about doing away with the readynas as the windows read/write performance has been awfull for a long time.. these tweaks has made it usable again. thankyou so much

  46. Heikki Says:
    April 27th, 2011 at 11:08 am

    This was cool! I had suffered from a poor performance with my ReadyNAS and Buffalo wireless router.
    Today I found this gem and now the files are flying :)

    Win7/32, HP ProBook 4710s, Buffalo Airstation 54g-something…


You must be logged in to post a comment.