geoff@ncelvax.UUCP (Geoff Dann) (03/21/90)
I've set up NET over a KISS TNC (MFJ-1274) . Throughput on FTP seems slow. Often I get the message "AX25 Receive:" "Bad Header!" Any idea what this is? I'm digipeating through a NETROM node to the only other two stations running NET. This happens most often right after my TNC has transmitted, which makes me wonder if the digipeater is transmitting my packet before my TNC/radio is ready to receive. This happens with ka9q 881225 and pe1chl/ka9q 871225.12. Related question maybe: Anyone have a list of what the tnc parameters are, and suggested ranges? The documentation is sketchy on them. Thanks..... Geoff n3cfx geoff@ncelvax.nosc.navy.mil n3cfx@n3cfx.ampr.org (if I get it running!) n3cfx@w8akf-1
karn@ka9q.bellcore.com (Phil Karn) (03/21/90)
The message "Bad Header!" from NET (I assume you have trace turned on) means exactly what it says: that the host computer received a frame from the TNC that has a bad AX.25 header. This is usually due to character loss in the link between the TNC and the host computer. There is no flow control in the KISS TNC protocol, so this problem can happen if you run the link too fast. Try slowing it down to 4800 or 2400 baud. Phil