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(1) To configure libpcap under AIX 4.x, you should use DLPI instead
    of BPF, since IBM's version of BPF includes some undocumented
    and unsupported changes to the original BPF.

    This can be done by specifying the flag:

       --with-pcap=dlpi

    to the "configure" script for libpcap.

(2)  Also, it is a good idea to have the latest version of the DLPI
     driver on your system, since certain versions may be buggy and
     cause your AIX system to crash.  DLPI is included in the
     fileset bos.rte.tty.  I found that the DLPI driver that came with
     AIX 4.3.2 was buggy, and had to upgrade to bos.rte.tty 4.3.2.4:

     lslpp -l bos.rte.tty

     bos.rte.tty     4.3.2.4  COMMITTED  Base TTY Support and Commands

     Updates for AIX filesets can be obtained from:
     ftp://service.software.ibm.com/aix/fixes/

     These updates can be installed with the smit program.

(3)  After compiling libpcap, you need to make sure that the DLPI driver
     is loaded.  Type:

     strload -q -d dlpi

     If the result is:
     dlpi: yes

     then the DLPI driver is loaded correctly.

     If it is:
     dlpi: no

     Then you need to type:
     strload -f /etc/dlpi.conf
 
     Check again with strload -q -d dlpi that the dlpi driver is loaded.  

     Alternatively, you can uncomment the lines for DLPI in
     /etc/pse.conf and reboot the machine; this way DLPI will always
     be loaded when you boot your system.