pppd
uses IP tunnels to pass packets between the serial port and IP layer.
During bootup, /sbin/init.d/ppp
creates 16 IP tunnels (the default value is defined in /etc/ppp/tunconf)
which will support 16 concurrent pppd
processes. Each IP tunnel creates three device files. Each pppd
process facilitates a PPP connection. The kernel can support a
maximum of 64 IP tunnels. If you need more than 16 IP tunnels,
you can increase the value of NTUN in /etc/ppp/tunconf
and reboot the system.
See tun(4) for more details
about configuring IP tunnels.
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