[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: My ADSL saga - Updates
- To: <haim(at-nospam)hageltech.com>
- Subject: RE: My ADSL saga - Updates
- From: Dani Arbel <darbel(at-nospam)techunix.technion.ac.il>
- Date: Thu, 5 Jul 2001 21:40:21 +0300 (IDT)
- Cc: "'ILUG'" <linux-il(at-nospam)linux.org.il>
- Delivered-To: linux.org.il-linux-il@linux.org.il
- In-Reply-To: <000001c1054e$91303c50$0100a8c0@hagel.co.il>
- Sender: linux-il-bounce(at-nospam)cs.huji.ac.il
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
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: linux-il-bounce@cs.huji.ac.il
> > [mailto:linux-il-bounce@cs.huji.ac.il] 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
> > >
> > > =================================================================
> > > To unsubscribe, send mail to linux-il-request@linux.org.il with
> > > the word "unsubscribe" in the message body, e.g., run the command
> > > echo unsubscribe | mail linux-il-request@linux.org.il
> > >
> >
> >
> > =================================================================
> > To unsubscribe, send mail to linux-il-request@linux.org.il with
> > the word "unsubscribe" in the message body, e.g., run the command
> > echo unsubscribe | mail linux-il-request@linux.org.il
> >
> >
> >
>
>
> ================================To unsubscribe, send mail to linux-il-request@linux.org.il with
> the word "unsubscribe" in the message body, e.g., run the command
> echo unsubscribe | mail linux-il-request@linux.org.il
>
=================================================================
To unsubscribe, send mail to linux-il-request@linux.org.il with
the word "unsubscribe" in the message body, e.g., run the command
echo unsubscribe | mail linux-il-request@linux.org.il