Date: Tue, 15 Dec 98 11:02:23 PST From: "Igor B. Bykhalo" <goshik@binep.ac.ru> To: "FreeBSD-questions" <freebsd-questions@FreeBSD.ORG> Subject: Leased line - SLIP or PPP? Message-ID: <MAPI.Id.0016.006f7368696b20203030303630303036@MAPI.to.RFC822>
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Good time of day all. I have some problems with the connection of our LAN (3 Ethernet segments) to ISP's backbone. The connection is: 486DX2/66 +---+ leased line +---+ 486DX4/100 16MB | A |--------------------| B | 8MB 3*3C509B +---+ ca. 1 km +---+ 3C509B FreeBSD ST16550 16550A FreeBSD SLIP MTU=296 SLIP Modems used are 115.2 kbps asynchronous ones without hardware flow control/buffering. When point B was Cisco's 2514 AUX port, speed was 38.4 kbps only, but SLIP worked fine (netstat reported from 1e-4 to 1e-3 of errors on input). But then we decided to change B to PC router to increase speed to 115.2. Now I'm getting from 10% to 20% of errors on input packets, but the worst is that connection acts with large delays. Looks like the line is rather noisy and the system spend much time retransmitting bad packets. As I recall, such a behaviour was mentioned in RFC1055 as a "feature" of SLIP (am I wrong?). Questions: 1. How can I introduce some error correction / flow control in this situation? 2. If 1 is not possible, will the replacement of SLIP with PPP be helpful? Note that it is not possible to change hardware/line in the near future, so I must play only with software. I suspect this is RTFM, but I'm quite new with UNIX and possibly you can give me some tips or pointers about SLIP or PPP usage over leased lines? Thank you for your time, Igor Sorry for my poor English To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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