I am working on a 56k packet interface here in San Diego. Currently I have Linux kernel 2.2.13 using the internal dmascc driver. The resultant network interface is dmascc0 in which the MTU is set at 1500. This interface is ported too Tnos 2.30 via net2kiss and LinFBB 7.01f via ax25-utils. I can access remote sites via telnet and connect sequences from the Tnos application but can not do this from the LinFBB app. I can however connect from the remote site to the Linux Node (node-0.3.0) and then connect to LinFBB using the internal node command. If I connect from the remote site directly to the LinFBB port I get connected but its like a pactor connection and constant receive/transmit frames. Since the max packet size for LinFBB is 256 is there any cure for handling interfaces with larger MTU (like 1500) ? I also have an internal Slip link (slattach) that has an internal MTU of 576. This connects the Tnos app to the linux kernel. Seems that 576 is optimum but would like to hear from others if something else is used. With different MTU/Paclen settings on the same machine I am sure that I have become my own worst problem. But how does one interface a high speed port to these applications with a minimum of fragmentation? Happy New Year, John
