Date: Wed, 27 Aug 1997 10:59:31 -0400 (EDT) From: "David R. Rippel" <root@shadowsphere.com> To: freebsd-questions@FreeBSD.ORG Subject: FreeBSD -> Crywnr DOS PLIP Link Message-ID: <Pine.BSF.3.96.970827104733.6832A-100000@shadowsphere.com>
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I've had a bad time right from the beginning with FreeBSD PLIP, but I'm not about to give up ;). I've successfully linked two FreeBSD 2.2-releng machines using 'ifconfig 10.0.0.1 10.0.0.2' and vice versa with no problems, getting a sustained data transfer rate of around 72k/s, I was quite impressed. I then attempted to link the same FreeBSD 2.2-releng box to a dos 6.22 machine running crywnr's plip.com on a packet vector 'plip.com 0x60 7 0x3bc' and using NCSA's telnet 'telbin.exe' for hosting services. On the FreeBSD machine i issued 'ifconfig inet link0 10.0.0.1 10.0.0.1 mtu 1024 netmask 255.255.255.0 arp' and the lp0 interface/routing came up successfully. I was able to send icmp/udp/etc to the DOS machine with no problems. I could begin ftp sessions, however, they would jam up once the TCP datagrams began to flow. Basically, TCP wasn't responding at all. I couldn't get any telnet traffic accross the link. Upon further investigation, 'netstat -p ip' revealed that FreeBSD was rejecting the DOS box's TCP packets with a 'incorrect version'. However, both machines ue IPv4, so I don't see where this is the problem. According to /usr/src/sys/i386/isa/lpt.c, a Crywnr --> DOS link is supported with the link0 flag, which I did use. Well, that's only about half true. I mailed phk@freebsd.org about this, however, he's much to busy to consider my problem unfortunatly. I heard from the varions #freebsd channels that many people have had a similar experience such as this. One person suggested it may be a problem with compression, though I'm not sure about the relevance of this seeing where the link0 flag comes in. Anyways, I ask any of you whom have any advice whatsoever to offer on this to reply, and if you've had a successful Crywnr (DOS) --> FreeBSD link, please tell me how you accomplished it in great detail. It would be most appreciated. Just for the record, I have attempted this same link but with a Linux 2.0.30 machine to the same DOS machine with success using 'ifconfig plip0 up 10.0.0.1 pointopoint 10.0.0.2 arp; route add plip0'. So I do know that the problem is on the FreeBSD side, at least from what I can tell. Anyways, please give me any and all of your input, I've already scanned around some of the previous messages on the freebsd-questions list and gone on some rather pointless searches accross netland just to discover there is very little information on this subject. Linux's PLIP-HOWTO proved useless, since, afterall, it relates to Linux :P. lp(4) gave me a little better understanding of the (-)link0 flag, but that's about it. --- David R. Rippel ShadowSphere System Administrator (operator@shadowsphere.com)
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