Using BPF:

(1) AIX 4.x's version of BPF is undocumented and somewhat unstandard; the

    current BPF support code includes changes that should work around

    that; it appears to compile and work on at least one AIX 4.3.3

    machine.

    Note that the BPF driver and the "/dev/bpf" devices might not exist

    on your machine; AIX's tcpdump loads the driver and creates the

    devices if they don't already exist.  Our libpcap should do the

    same, and the configure script should detect that it's on an AIX

    system and choose BPF even if the devices aren't there.

    Also note that tcpdump _binary_ compiled on AIX 4 may have a problem

    doing the initial loading of the BPF driver if copied to AIX 5 and

    run there (GH #52). tcpdump binary natively compiled on AIX 5 should

    not have this issue.

(2) If libpcap doesn't compile on your machine when configured to use

    BPF, or if the workarounds fail to make it work correctly, you

    should send to tcpdump-workers@lists.tcpdump.org a detailed bug

    report (if the compile fails, send us the compile error messages;

    if it compiles but fails to work correctly, send us as detailed as

    possible a description of the symptoms, including indications of the

    network link-layer type being wrong or time stamps being wrong).

    If you fix the problems yourself, please submit a patch by forking

    the branch at

	https://github.com/the-tcpdump-group/libpcap/issues

    and issuing a pull request, so we can incorporate the fixes into the

    next release.

    If you don't fix the problems yourself, you can, as a workaround,

    make libpcap use DLPI instead of BPF.

    This can be done by specifying the flag:

       --with-pcap=dlpi

    to the "configure" script for libpcap.

If you use DLPI:

(1) 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.

(2) 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.

(3) There appears to be a problem in the DLPI code in some versions of

    AIX, causing a warning about DL_PROMISC_MULTI failing; this might

    be responsible for DLPI not being able to capture outgoing packets.