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To build a kernel for use with the loadable kernel module, follow these steps:
     1. In /sys/i386/conf, create a new kernel config file (to be used
        with IPFILTER), i.e. FIREWALL and run config, i.e. "config FIREWALL"

     2. build the object files, telling it the name of the kernel to be
        used.  "freebsd22" MUST be the target, so the command would be
        something like this: "make freebsd22 IPFILKERN=FIREWALL"

     3. do "make install-bsd"         (probably has to be done as root)

     4.  run "FreeBSD-2.2/minstall" as root

     5. build a new kernel

     6. install and reboot with the new kernel

     7. use modload(8) to load the packet filter with:           modload
if_ipl.o

     8. do "modstat" to confirm that it has been loaded successfully.

There is no need to use mknod to create the device in /dev; - upon loading the
module, it will create itself with the correct values,
  under the name (IPL_NAME) from the Makefile.  It will also remove itself
  from /dev when it is modunload'd.

To build a kernel with the IP filter, follow these steps:

*** KERNEL INSTALL CURRENTLY UNSUPPORTED ***      1. do "make freebsd22"

     2. do "make install-bsd"         (probably has to be done as root)

     3.  run "FreeBSD-2.2/kinstall" as root

     4. build a new kernel

     5a) For FreeBSD 2.2 (or later)         create devices for IP Filter as
follows:        mknod /dev/ipl c 79 0         mknod /dev/ipnat c 79 1
           mknod /dev/ipstate c 79 2          mknod /dev/ipauth c 79 3

     5b) For versions prior to FreeBSD 2.2:      create devices for IP Filter
as follows (assuming it was
            installed into the device table as char dev 20):           mknod
/dev/ipl c 20 0           mknod /dev/ipnat c 20 1            mknod
/dev/ipstate c 20 2            mknod /dev/ipauth c 20 3

     6. install and reboot with the new kernel

Darren Reed darrenr@pobox.com



                               November 27, 2024                            ()