FreeBSD has a number of ways to link one computer to another. To establish a network
or Internet connection through a dial-up modem, or to allow others to do so through you,
requires the use of PPP or SLIP. This chapter describes setting up these modem-based
communication services in detail.
After reading this chapter, you will know:
How to set up user PPP.
How to set up kernel PPP.
How to set up PPPoE (PPP over Ethernet).
How to set up PPPoA (PPP over ATM).
How to configure and set up a SLIP client and server.
Before reading this chapter, you should:
You may be wondering what the main difference is between user PPP and kernel PPP. The
answer is simple: user PPP processes the inbound and outbound data in userland rather
than in the kernel. This is expensive in terms of copying the data between the kernel and
userland, but allows a far more feature-rich PPP implementation. User PPP uses the tun device to communicate with the outside world whereas kernel
PPP uses the ppp device.
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Note: Throughout in this chapter, user PPP will simply be referred to as ppp unless a distinction needs to be made between it and any
other PPP software such as pppd. Unless otherwise stated, all
of the commands explained in this chapter should be executed as root.