>
> Haim,
> The default window on linux is 64k. should be enough and over
> the b/w you
> have from your ISP (if RTT is ~300 ms then 64K window is
> about 200Kb/s .
> Does tour ISP give you this much?).
> Dani
Yes indeed. When I start one download from some U.S-based site, I get
around 150-200 kbps, however when I start several downloads from the
SAME site, I can get up to 1.5-1.8 Mbps. Barak's advertising is "2 mbps
downstream", I never got that much, but I do get close sometimes.
Now 300 ms is very good, I often get twice as slow, so let's see, 64 K @
600 ms, we will get around 100 Kb/sec = 800 kbps : half of what I can
easily get. I defenitely see place for improvement.
Haim.
>
> On Thu, 5 Jul 2001, Haim Gelfenbeyn wrote:
>
> > Hello,
> > As far as I understand, changing MTU on a router should not prevent
> > clients with higher MTU working. I mean that if some router receives
> > packet it cannot pass as-is, it should return some kind of
> ICMP error,
> > and the client should re-send the packet with smaller MTU.
> So if it's
> > true and the problem is with MTU on Netvision router, then
> either the
> > router is misconfigured, or incoming icmp is incorrectly
> blocked with
> > firewall rules on client.
> >
> > Other (but close) topic:
> > ADSL connection can be described as high-bandwidth
> high-latency (to U.S.
> > networks at least), therefore transfer times can be improved greatly
> > with larger TCP receive window. I saw that changing RWIN on
> Windows can
> > gain 30% in download speeds with ADSL. Anybody knows if
> receive window
> > is worth tweaking on Linux, and if yes, how to do it
> correctly. I took a
> > look at kernel documentation, and then in the /proc, but
> there are too
> > many parameters there, and I cannot see any apparent
> results by changing
> > them. I'm using 2.4.5 kernel.
> >
> > Haim Gelfenbeyn.
> >
> >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED]
> > > [mailto:[EMAIL PROTECTED]] On Behalf Of Dani Arbel
> > > Sent: Thursday, July 05, 2001 3:14 PM
> > > To: Hetz Ben Hamo
> > > Cc: ILUG
> > > Subject: Re: My ADSL saga - Updates
> > >
> > >
> > > Hetz,
> > > any idea WHY they did it? Is it just to break the
> > > masquerading setup, or
> > > is there some technical reason (say, if they do a tunnel
> > > inside a tunnel
> > > ..).
> > > Cause if they did it just because, next they will reduce
> > > another 20 bytes
> > > of the MTU ...
> > > Dani
> > >
> > > On Thu, 5 Jul 2001, Hetz Ben Hamo wrote:
> > >
> > > > Hi All,
> > > >
> > > > Well, my good friend Andrei and I sat on my machines and
> > > decided that will
> > > > solve this issue - no matter what the costs ;)
> > > >
> > > > So we found out...
> > > >
> > > > 1. Netivision changed the MTU to 1424 - anyone got an email
> > > notification
> > > > about this? cause I didn't..
> > > >
> > > > 2. My firewall is based still on kernel 2.2.x - meaning -
> > > it won't fix the
> > > > mtu bug which was fixed on kernel 2.4.x - thats why my
> > > Linux workstation had
> > > > those problems..
> > > >
> > > > So - if you are connected to Netvision - set your ADSL
> > > firewall to MTU 1424.
> > > > Is it based on kernel 2.2.x? then either upgrade it to
> > > 2.4.6 (which came out
> > > > today) or do the more pain way - update all machines behind
> > > it to mtu 1424 on
> > > > their ethernet...
> > > >
> > > > Fun Fun Fun....
> > > >
> > > > Hetz
> > > >
> > > >
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