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How much speed do you really loose when using encryption?

Discussion in 'Other Linksys Equipment' started by Eugenios, May 29, 2005.

  1. Eugenios

    Eugenios Network Guru Member

    I was told that using encryption brings down the speed of your wireless network by 30%. Is this true? Of course I can't imagine not having at least WPA-TKIP for protection. Does anyone know what the real loss is in speed when using encryption?

    Eugenios
     
  2. Avenger20

    Avenger20 Network Guru Member

    The WRT54G(S) has hardware encryption. On this device you shouldn't notice any big difference. Other devices with software encryption might slow down 30 to 50%
     
  3. Eugenios

    Eugenios Network Guru Member

    So that means that the (S) which is the speedbooster, is really a hardware encryption card and the plain vanilla flavour uses software encryption. Okay... Its nice to know this because when I bought the vanilla flavored card it didn't specify the difference!

    Thanks,

    Eugenios
     
  4. Traveller

    Traveller Network Guru Member

    Hey Eugenios,

    I have yet to come across modern wifi-equipment that isn't capable of doing it's encryption in hardware. Speedbooster gets it's gain by using slightly more strict timing and larger packets, a bit like frame-bursting, AFAIK. It should work equally well with or without encryption.


    Grtz,

    Traveller
     
  5. littlewhoo

    littlewhoo Network Guru Member

    No, the version without speedbooster ist also using hardware encryption. Speedbooster has nothing to do with encryption. I think with WRT54G(S) Avenger20 meant WRT54G or WRT54GS.

    Today most wireless devices use hardware encryption. Every wireless device that does support AES encryption has to use hardware encryption, because AES can't be done in software on the weak CPUs of these routers.
     
  6. Eugenios

    Eugenios Network Guru Member

    Traveller,

    Okay, and how is it that my "simple" WAP54G has an option for "Burst mode"? I am getting confused. I bought the non-speedbooster accesspoint and the non-speedbooster pccard. When setting the AP I noticed in the advanced setting an option for "Burst mode". How can this be? Does LinkSys put the same firmware on all their products? lol :D

    As for the encryption you have to be right because the encryption is in the firmware, but the difference would be to me "how" it is run. As a seperate process or as a basic part of the I/O? Could their be a diffirence?

    Anyway, I will test the speeds with and without encryption to see what the overhead is with encryption. Not that I plan on turning off encryption, but it really would be a loser if the overhead is 30-50%.

    BTW, how much of a boost do you get from the speedbooster version?

    Eugenios
     
  7. Eugenios

    Eugenios Network Guru Member

    Intersting. I like the fact that AES is hardwired into the system.

    Question: why does my "non-superbooster" WAP54G give me the option to use AES and my "non-superbooster" WPC54G does not give me this option?

    Eugenios
     
  8. littlewhoo

    littlewhoo Network Guru Member

    Burst mode has nothing to do with speedbooster. It's a completely different feature.

    According to Linksys at most 35%.
    According to my own tests at most 20-25%. Usually 10-20%.
     
  9. littlewhoo

    littlewhoo Network Guru Member

    Because, as I already wrote, speed enhancing features like speedbooster, superbooster or whatever you call it, have *absolutely nothing* to do with encryption.
     
  10. Eugenios

    Eugenios Network Guru Member

    I guess I didn't make myself clear. What I wanted to say is that I purchased the same type of Access Point and PCcard. The Access Point supports AES and the PCcard doesn't. Isn't that a little weird?!

    Eugenios
     
  11. Traveller

    Traveller Network Guru Member

    Hey Eugenios,

    The WPC54G should be capable of running AES. Make sure you have the latest drivers from Linksys installed and your OS supports WPA as well. Pre-SP2 Windows XP required an update from Microsoft to support WPA, if I remember correctly.

    See: http://support.microsoft.com/default.aspx?scid=kb;en-us;815485

    It also has a link to the actual update near the bottom.


    Grtz,

    Traveller
     
  12. Eugenios

    Eugenios Network Guru Member

    I have XP with SP2, also the latest software version.
    Talked to LinkSys support but they haven't answered me yet.
    The funny thing is that the AP supports AES, and when I first
    install the software on my laptop the configuration utility shows
    the AES option. However, after rebooting the option simply
    disappears!

    Eugenios
     
  13. Traveller

    Traveller Network Guru Member

    Hey Eugenios,

    Sounds like a problem with the Linksys-software. Have you tried the standard WZC yet? It sometimes works much better than the software shipped with the card itself.


    Grtz,

    Traveller
     
  14. Eugenios

    Eugenios Network Guru Member

    Traveller,

    Yes I did, but the results were the same. Seems like the problem is with the firmware. I bought the WPC54G just one month ago. Can't find any newer firmware at the LinkSys site. I am waiting for an answer from them. It just might take a few years. I'll be patient... :D

    Eugenios
     
  15. Eugenios

    Eugenios Network Guru Member

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