32bit vs 64bit Linux

Sun Jun 2 17:37:52 MST 2013

Yes!!  What a great thread.  

My new box has a 3rd generation i3 and 8gb of RAM.  It is LAMP exclusively - public facing web server.  Over kill for what I am doing.   In a nutshell I should run the 64bit version.  This is an experiment and a vehicle for learning.  So far it has exceeded my expectations. 

Thank you to all that responded, this thread holds a wealth of knowledge!!

I'm starting a new thread on how AMD and Intel manage memory. 

Thanks again for such a great thread!!

------------------------

Keith Smith

--- On Sat, 6/1/13, Stephen <cryptworks at gmail.com> wrote:

From: Stephen <cryptworks at gmail.com>
Subject: Re: 32bit vs 64bit Linux
To: "Main PLUG discussion list" <plug-discuss at lists.phxlinux.org>
Date: Saturday, June 1, 2013, 1:18 PM

Thats some good reading. This week has been a great week. They just added my router to ddwrt. Ubuntu touch just got built for my phone... And i might be able to get away with a Linux work environment...

On Saturday, June 1, 2013, Lisa Kachold  wrote:
Stephen,

On Fri, May 31, 2013 at 8:07 PM, Stephen <cryptworks at gmail.com> wrote:

How well does it play with Cisco as an alternative to the anyconnect application?You don't *have* to use the Cisco provided client (as you already well know) there's VPNC as well, which works *very* well under linux, and is insanely easy to build, configure and run.

 Generally, OpenVPN is a SSL VPN and Cisco uses IPSEC, but that doesn't mean it's not possible.  Most all of Cisco's newer VPN offerings support SSL VPN. 

Do you have a specific Cisco VPN device in mind? Or do you mean any Cisco VPN device?

If you mean a VPN 3000 concentrator, I would say no.

If you mean an ASA device, I would say yes.
If you mean a IOS device, I would say maybe. (Depending on version and a good deal of tinkering)

If you mean a PIX device, I would say maybe. (Depending on version and a good deal of banging head against wall)

Technically "it's not supported".   But the "not supported" tag (primarily used to reduce costs of large businesses trying to train their non-technical customers to use anything more complex than an off/on button) is clearly not any limitation for linux people? 

Just go with a Cisco compatible client!
OpenConnect is still a very good product, and I would choose it over Cisco's client any day! http://www.infradead.org/openconnect/

Also, you can allow OpenVPN through the cisco firewall and run both IPSEC and SSL VPN, by getting a nice OpenVPNAS Virtual Appliance, you will be up and running in 1/2 hour, plus your users can go right to the VPN server and authenticate and download their clients without any big fuss.  Just because you have a Cisco VPN available, doesn't mean you must use that IPSEC virtual private tunnel exclusively.  Once you allow SSL VPN, you can use a quick setup OpenVPN AS Server:  

Here's what the OpenVPN Access Server looks like: https://12.159.65.84/?src=connect  PLUG HackFest VPN services for Labs in the DeVry Rack at OneNeck Hosting.

Reference:  http://www.unix-ag.uni-kl.de/~massar/vpnc/Installation Reference vpnc Ubuntu:  http://www.ed.ac.uk/schools-departments/information-services/services/computing/desktop-personal/vpn/vpn-cisco-client/vpn-cisco-ubuntu

Cisco VPN FAQ:  http://www.cisco.com/en/US/products/sw/secursw/ps2308/products_qanda_item09186a00801c2dbe.shtml

Examples of 64bit OS Cisco client issues:  http://micro.stanford.edu/wiki/How_to_install_and_configure_the_Cisco_VPN_client_on_a_Linux_computer#64-bit_operating_system_errors

On May 31, 2013 5:23 PM, "Lisa Kachold" <lisakachold at obnosis.com> wrote:

Stephen,

On Fri, May 31, 2013 at 2:11 PM, Stephen Rufle <stephen.p.rufle at cox.net> wrote:

    My only compatibly issue was getting
      the VPN tunnel that my job uses to work in 64 bit.

      Juniper network-connect software on Ubuntu not sure what version,
      but it was around 2011. My advice is to do a 64 bit install and
      then do a tests with your personal list of high priority software.
OpenVPN works wonderfully with Juniper VPN's; completely supplanting the Network-Connect application.

http://vpnthebestvpn.com/vpn1/juniper-vpn-64-bit.html 

      On 5/31/13 9:28 AM, keith smith wrote:

              Hi,

              Even though I have 64bit hardware I always install the
              32bit version of Linux.  I do so because of the past
              discussions on this list that made me believe the 32bit OS
              was better because 64bit caching is actually slower due to
              the requirement that the cache be filled to a certain
              point before it is moved.  I think I recall something
              about the amount of RAM having some effect here also. 

              Using a 32bit version over a 64bit version seems counter
              intuitive, however that is what I have taken away from
              these conversations about 32bit vs 64bit Linux. 

              I'm using CentOS 6.x on a LAMP server that gets a low
              amount of traffic.   However I may make the jump to Linux
              on my desktop this summer. (this will be my 3rd attempt to
              become M$ free except one VM so I can use IE for testing)
              I think all of my hardware is 64bit.   

              So that begs the question, is 32bit better than 64bit or
              do I not understand the issue?

              Thank you for your feedback.

              Keith

              ------------------------

              Keith Smith

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