querubin@uhunix1.uhcc.Hawaii.Edu (Mr. Antonio Querubin) (12/12/90)
I am having trouble sending very large files to a SUN workstation that is connected to our LAN through an IBM PC running KA9Q (NOS). The PC connects to the LAN via a 3C501 board and to the SUN via a 4800 BAUD SLIP line. There doesn't seem to be much twiddling that can be done with SLIP on the SUN so I'm assuming the problems are caused by the way I've got NOS running on the PC. A telnet session to the SUN will generally work fine although once in a while there are long pauses between output (possibly caused by line errors from the SUN to the PC). FTP'ing a small file will work but is quite slow. FTP'ing a large file always fails with a 'broken pipe' type of error message. I've read that the 3C501 can't handle packets that arrive too close to one another so I've set the TCP window size to equal the MSS size. Here are the pertinent entries from the autoexec.net file: ip address 128.171.11.16 attach packet 0x60 lan 3 1500 attach asy 0x3f8 4 slip sl0 10060 1006 4800 ip ttl 16 tcp mss 1460 tcp window 1460 route add [128.171.11.0]/24 lan route add 128.171.11.32 sl0 arp add 128.171.11.255 ethernet ff:ff:ff:ff:ff:ff arp publish 128.171.11.32 ethernet 02:60:8c:34:39:07 rip add 128.171.11.255 30 rip add 128.171.11.32 30 rip merge on start rip Would appreciate any suggestions to fine-tune the above parameters if in fact that's where the problem is. querubin@uhunix.uhcc.hawaii.edu