[TriLUG] Tuning WAN links

[Shawn Hood]

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