Since I get questions about how to use the current kernels for axip or axudp tunnel setups, here is my solution for this, using socat: Here is an example for an axip tunnel. First, create a transparent pty pair, lets say axip an kip located in /var/ax25 (names and locations can be chosen freely): /usr/bin/socat pty,link=/var/ax25/axip,raw,echo=0 pty,link=/var/ax25/kip,raw,echo=0 & Next, attach the kernel side to one end and create a ax25 port let say 'aprs' with address 44.128.1.1 and netmask /32: /usr/bin/kissattach -l /var/ax25/kip aprs 44.128.1.1 ifconfig ax0 netmask 255.255.255.255 (ax0 is the first port created by kissattach) Also, configure port 'aprs' in the ax25 daemon and start it... /usr/sbin/ax25d The other end needs to be configured in the ax25ipd daemon config file to use the other end provided by socat: mode tnc (...) device /var/ax25/axip (...) route n0call 44.128.2.3. b (...) I think this will help, Marius, YO2LOJ