questions about interfaces

[Saverio Iacovelli <iacovelli_mail@xxxxxxxx>]

#ifconfig -a
rl0:
flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu
1500
	inet6 fe80::20e:2eff:fe77:17a7%rl0 prefixlen 64
scopeid 0x1 
	inet 192.168.1.6 netmask 0xffffff00 broadcast
255.255.255.255
	ether 00:0e:2e:77:17:a7
	media: Ethernet autoselect (100baseTX <full-duplex>)
	status: active
vr0:
flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu
1500
	inet6 fe80::216:ecff:fe02:a062%vr0 prefixlen 64
scopeid 0x2 
	inet 0.0.0.0 netmask 0xff000000 broadcast
255.255.255.255
	ether 00:16:ec:02:a0:62
	media: Ethernet autoselect (none)
	status: no carrier
lp0: flags=8810<POINTOPOINT,SIMPLEX,MULTICAST> mtu
1500
sl0: flags=c010<POINTOPOINT,LINK2,MULTICAST> mtu 552
faith0: flags=8002<BROADCAST,MULTICAST> mtu 1500
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu
16384
	inet 127.0.0.1 netmask 0xff000000 
	inet6 ::1 prefixlen 128 
	inet6 fe80::1%lo0 prefixlen 64 scopeid 0x6 
ppp0: flags=8010<POINTOPOINT,MULTICAST> mtu 1500


1) rl0 and vr0 are ethernet interfaces
2) lo0 is loopback interface
3) ppp0 is a virtual interface for ppp
4) What meaning sl0, lp0 and faith0?

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