all outgoing packets are duplicated on ax25 interface steps to reproduce: kissattach /dev/ttyS0 radio ifconfig ax0 10.0.0.2 arp -H ax25 -s 10.0.0.111 TEST-0 tshark -i ax0 ping -c1 10.0.0.111 root@debian:~# tshark -i ax0 Running as user "root" and group "root". This could be dangerous. tshark: Lua: Error during loading: [string "/usr/share/wireshark/init.lua"]:44: dofile has been disabled due to running Wireshark as superuser. See https://wiki.wireshark.org/CaptureSetup/CapturePrivileges for help in running Wireshark as an unprivileged user. Capturing on 'ax0' 1 0.000000000 10.0.0.2 → 10.0.0.111 ICMP 101 Echo (ping) request id=0x11a4, seq=1/256, ttl=64 2 0.000005518 10.0.0.2 → 10.0.0.111 ICMP 101 Echo (ping) request id=0x11a4, seq=1/256, ttl=64
Found same duplicates in Wireshark log. I've test on "direwolf" software modem. BUT, at least "direwolf" modem seems NOT sent this packages to channel. So duplicates do not appear in audio channel. Not sure, but seems it is some representations bug. Also, "ifconfig ax0" show same picture - while Wireshark show two duplicate packets, "TX packets" counter increases only to one packet. Any news about bug welcome! Env: Ubuntu 20.04 + Direwolf 1.7 (dev) + AX.25 My setup (for direct audio connect): $ direwolf -p -B 19200 -n 1 -I 1 $ sudo /usr/sbin/kissattach $TNC_PTS vradio $IP # Setup low delays + half duplex $ sudo /usr/sbin/kissparms -p vradio -t 20 -s 10 -r 32 -l 50 -f n