[an error occurred while processing this directive] FreeBSD Handbook : PPP and SLIP : Setting up user PPP : Building a ppp ready kernel
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11.1.2. Building a ppp ready kernel

As the description states, ``ppp'' uses the kernel ``tun'' device. It is necessary to make sure that your kernel has support for this device compiled in.

To check this, go to your kernel compile directory (probably /sys/i386/conf) and examine your kernel configuration file. It needs to have the line 

pseudo-device	  tun		1
in it somewhere. The stock GENERIC kernel has this as standard, so if you have not installed a custom kernel you don't have to change anything. If your kernel configuration file does not have this line in it then you should add the line, re-compile and then re-install the kernel. Boot from this new kernel.

FreeBSD Handbook : PPP and SLIP : Setting up user PPP : Building a ppp ready kernel
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Next: Check the tun device [an error occurred while processing this directive]