From owner-freebsd-questions Sun Feb 24 5:22:51 2002 Delivered-To: freebsd-questions@freebsd.org Received: from hk.com (ip-1-8-104-152.rev.dyxnet.com [152.104.8.1]) by hub.freebsd.org (Postfix) with ESMTP id C2BAD37B417 for ; Sun, 24 Feb 2002 05:22:36 -0800 (PST) Received: from ip-25-8-104-152.rev.dyxnet.com (ip-25-8-104-152.rev.dyxnet.com [152.104.8.25]) by hk.com (Postfix) with ESMTP id 519E61A661B; Sun, 24 Feb 2002 21:24:37 +0800 (CST) Date: Sun, 24 Feb 2002 21:22:30 +0800 (Taipei Standard Time) From: "Maren S. Leizaola" To: Rod Person Cc: FreeBSD Questions Subject: Re: SQUEEEZING the most bandwidth out of a 33.6 modem In-Reply-To: <20020223202740.23179932.roddierod@yahoo.com> Message-ID: X-X-Sender: maren@leizaola.com MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Sat, 23 Feb 2002, Rod Person wrote: | Hi All, | | I have a US Robotics Sportster 33.6 external modem (it flashable to 56k). | I was wondering if anyone had tips, trick or suggested reading on how to squeeze bandwidth out of this modem. Rod, One of the things I use to do here in HK with the USR Couriers V-Everything. I ordered a private wire back to my office. A private wire is circuit that is not connected to the PSTN, it is used to extend phone lines which are in another location back into a PBX. I would run the USR Couriers in leased line mode, so that as soon as you power them up they hand shake. It was pretty stable. In raw data I could get 90Kbit/s sustained (on HTML or files which would compress heavily), don't expect to get these through puts as they were pretty much lab conditions and sometimes I was able. In burst rates I could get 113Kbit/s. One thing to note is that these private wires have lower latency here in Hong Kong than normal phone lines so data flowed faster. I implemented several of these in some cases based on what two locations I was connecting I would get circuits which had no loading or conditioning. That means you could run digital Line Drivers and get 128Kbit/256Kbit circuits on them and pay a rate of US$20/month for the circuit. Anyway to answer you question here are some suggestions but are dependant on you being able to control both sides of the link. Upgrade it 56K and plug it into a PPP connection. Make sure have TCP header compression enabled on both sides. See what IPCP and othe protocols you can use. Another thing that you might want to try is stac compression or one of those link compression protocols, I am not sure what features do the current PPP implementations have. Another thing you could do is use and SSH based VPN tunnel to tunnel the traffic over the link and then go onto the net, this assumes that the remote end is connected to the net and has a reasonable size pipe. SSH has some pretty good compression and I suspect you will be able to get more throughput than the other suggestions. Good luck! Regards, Maren. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message