TCP/IP, FTP, and MSDOS?

A good alternative that I haven't seen mentioned is NCSA Telnet. NCSA Telnet not only is a very good telnet client, but it also has a built in FTP server. It will work with a packet driver, and there is also a version that has support for popular network cards built-in directly so that a packet driver is not necessary. The performance of FTP transfers is very good. NCSA doesn't give you a stack that you can use for your own apps. Source code is available. On a slightly related note, I've been working on my own TCP/IP for small IBM PC class machines for about a year. It's in C using Borland Turbo C++ 3.0 for DOS. It supports ARP, UDP and TCP at the moment - no ICMP yet. Performance compared to other stacks is *very* good: Test machine: IBM PC XT with original 10MB hard disk, 3Com 3C503 NIC File send rate: 26.5KB/sec File receive rate: 24.6KB/sec Memory footprint varies .. it depends on how much buffering you want in your app and at the packet level. Code is about 50KB with all of the debug options and messages compiled in. Mike