[TriLUG] Tuning WAN links

[Shawn Hood]

GAH!

On 10/31/07, Shawn Hood <shawnlhood at gmail.com> wrote:
>
> Wow I really butchered that first sentenced.
>
> On 10/31/07, Shawn Hood <shawnlhood at gmail.com> wrote:
> >
> > Not such my load balance we want to do.  We really want to figure out
> > why we can't get above ~41Mbps, as well as why we're having to use a massive
> > window size and other configuration changes to utilize this pipe.
> >
> > I do understand it is a high-latency connection, and that things need to
> > be done to adequately utilize this pipe.  But nonetheless, it is a gigabit
> > connection and we can hardly push 41Mbps.  It has been tested by AboveNet
> > twice.  Of course, I know there's not much that can be said without seeing
> > specifics, but I hoping to get pointed in the way of some good documention,
> > books, tips, etc.
> >
> > Shawn
> >
> > On 10/31/07, OlsonE at aosa.army.mil <OlsonE at aosa.army.mil > wrote:
> > >
> > > For load balancing -- FatPipe is also excellent!
> > >
> > > -----Original Message-----
> > > From: trilug-bounces at trilug.org [mailto: trilug-bounces at trilug.org] On
> > > Behalf Of Greg Brown
> > > Sent: Wednesday, October 31, 2007 8:27 AM
> > > To: Triangle Linux Users Group General Discussion
> > > Subject: Re: [TriLUG] Tuning WAN links
> > >
> > > If your company is dropping that kind of coin you might want to look
> > > into clustering servers behind something like a Big IP F5 load
> > > balancer
> > > on the far end.  For tuning the WAN link itself I have had great
> > > success
> > > using Packeteer devices.
> > >
> > > http://www.f5.com/
> > > http://www.packeteer.com/
> > >
> > > On 10/30/07, Shawn Hood <shawnlhood at gmail.com> wrote:
> > > >
> > > > Hey guys...
> > > >
> > > > I've recently had a dedicated gigabit fiber WAN link that runs
> > > between
> > >
> > > > Rackspace in Dallas and an office in Bethesda, MD dropped in my lap.
> > > > It's not often (read: ever) that I'm given a high-bandwidth
> > > > high-latency link to tune.
> > > >
> > > > Here are the basics:
> > > >
> > > > Office in Bethesda
> > > > Catalyst 3560
> > > >     |
> > > > AboveNet POP - Vienna, VA
> > > > Catalyst 6509
> > > >     |
> > > > AboveNet IP/MPLS Backbone
> > > >     |
> > > > AboveNet POP - Dallas, TX
> > > > Catalyst 6509
> > > >     |
> > > > Rackspace - Dallas, TX
> > > > Catalyst 3560
> > > >
> > > >
> > > > I've run iperf between two RHEL4 boxes connected to the 3560s.  The
> > > > most throughput I've been able to get is ~45mbit by increasing the
> > > > buffer sizes in /etc/sysctl and using massive window sizes on iperf.
> > > > I was hoping you guys could point me in the right direction.  I need
> > > > to do some reading about how to get the most out of this link, and
> > > any
> > >
> > > > reference would be greatly appreciated.  Will this be a matter of
> > > > create a Linux router on each end to shape the traffic destined for
> > > > this link?  Is this something better suited for proprietary
> > > technology
> > >
> > > > that claims to 'auto-tune' this kinds of links.
> > > > I'm fairly fluent when it comes to talking about this stuff 'in
> > > theory,'
> > > > but
> > > > have yet to get any hands on experience.
> > > >
> > > > Questions, comments, suggestions?
> > > >
> > > > Shawn
> > > > --
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> > >
> >
> >
> >
> > --
> > Shawn Hood
> > (910) 670-1819 Mobile
> >
>
>
>
> --
> Shawn Hood
> (910) 670-1819 Mobile
>



-- 
Shawn Hood
(910) 670-1819 Mobile