AXLISTEN(1) | Linux Programmer's Manual | AXLISTEN(1) |
axlisten - monitor AX.25 traffic
axlisten [-8] [-a] [-c] [-h] [-i] [-p port] [-r] [-t..] [-v]
Axlisten uses SOCK_PACKET facilities to provide a network monitor of all AX.25 traffic heard by the system. Since KISS is implicitly promiscuous no special driver configurations are needed.
This version displays standard AX.25, PE1CHL extended AX.25, NET/ROM, Rose, ARP, IP, ICMP, TCP and UDP. It also displays IP, TCP, ICMP, TCP and UDP encapsulated within NET/ROM frames. The program also displays AX.25 and IP encapsulated within an IP frame, but see RFC1326 for reasons not to do so.
Axlisten makes an attempt at decoding some of the more common routing protocols. RSPF and RIP (both “normal” and G8BPQs RIP98) are traced. JNOS style NET/ROM node polls are also displayed.
Axlisten can use colors to make the output more readable. The ncurses library is used to accomplish this. Color support defaults to being disabled, and the -c parameter is used to enable it.
/etc/ax25/axports
axcall(1), mheard(1), beacon(1), ax25(4), netrom(4), rose(4), kissattach(8).
Axlisten does not validate the checksums of frames that support them (ie IP), therefore corrupt frames will be displayed with bogus values. The MSS of a TCP frame that contains that option is not displayed.
Alan Cox GW4PTS <alan@cymru.net>
Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>
Phil Karn KA9Q <karn@qualcomm.com>
Heikki Hannikainen OH7LZB <oh7lzb@sral.fi>
Scott Miller N1VG <scott@opentrac.org>
27 August 1996 | Linux |