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       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.


       -8        Indicates  that  the  terminal  is  capable of printing 8-bit
                 characters. This parameter is required for the  -i  parameter
                 to work.

       -a        Allow  for  the  monitoring  of  outgoing  frames  as well as
                 incoming ones.

       -c        Enable color support.

       -h        Dump the data portion of the packet in both  hexadecimal  and
                 ASCII. The default is to display data as ASCII only.

       -i        Map  IBM codepage 437 characters 128-158 to their ISO-Latin-1
                 equivalents.  This is a hack  for  scandinavian  users.  This
                 parameter  is  only  valid  when  used  with  the  -8  and -c

       -p port   Monitor only those frames received on a particular  port,  by
                 default all AX.25 devices are monitored.

       -r        Dump  the data portion in a "readable" fashion, which is more
                 suitable  for  tracing   plaintext   AX.25   traffic.   CR-LF
                 conversion is done.

       -t        Displays a timestamp with each packet received.

       -v        Display the version.




       axcall(1),   mheard(1),   beacon(1),   ax25(4),   netrom(4),   rose(4),


       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 <>
       Jonathan Naylor G4KLX <>
       Phil Karn KA9Q <>
       Heikki Hannikainen OH7LZB <>