From: "Naveen" <naveen at palettemm dot com>

> Is there any way to set "sysctl kern.coredump=0" for permanent?
>
> Regards
> Naveen

You need to back up your config.  Then open up the .xml with wordpad.  Make 
the beginning look like mine.  (With your names, of course)  Then restore 
the changed config.  It is then done on each reboot.  Note that the order on 
your config may be different, and stuff may be missing or added.  It does 
not matter as long as "<shellcmd>sysctl kern.coredump=0</shellcmd>" is 
somewhere in <system>.

    <system>
        <hostname>fw-quinta-wood</hostname>
        <domain>dnsalias.net</domain>
        <dnsallowoverride/>
        <username>admin</username>
        <password>xxxxx</password>
        <timezone>America/Chicago</timezone>
        <time-update-interval>300</time-update-interval>
        <timeservers>us.pool.ntp.org</timeservers>
        <webgui>
            <protocol>https</protocol>
            <port/>
            <certificate/>
            <private-key/>
            <expanddiags/>
        </webgui>
        <shellcmd>sysctl kern.coredump=0</shellcmd>
        <harddiskstandby/>
        <dnsserver>198.6.1.1</dnsserver>
        <dnsserver>4.2.2.2</dnsserver>
       
<notes>TGEgUXVpbnRhDQoyNDg2OCBJLTQ1IE4uIChSYXlmb3JkIFNhd2R1c3QgZXhpdCkNCldvb2RsYW5kcywgVFggNzczODYNCjI4MS02ODEtOTE4OA0KDQpQUFBvRSBsYXF1aW50YTQ1QHNiY2dsb2JhbC5uZXQgIGpLSDYwNCAyODItMjkyLTcwMTcNCg0KMTkyLjE2OC42MC4yMCBSbSAyMjENCjE5Mi4xNjguNjAuMjEgUm0gMjA4DQoxOTIuMTY4LjYwLjIyIFJtIDIxNQ0KMTkyLjE2OC42MC4yMiBSbSAyMzM=</notes>
    </system>