2003-06-13 12:33:33 +00:00
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.\" $FreeBSD$
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.\"
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.Dd June 13, 2003
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.Dt NATMIP 4
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.Os
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.Sh NAME
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.Nm natmip
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.Nd IP over ATM PVCs
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.Sh SYNOPSIS
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.Cd "device atm"
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.Cd "options NATM"
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.Sh DESCRIPTION
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The NATM protocol stack includes support for IP over ATM. Without any
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additional signalling stacks or other modules it is possible to build
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a CLIP (classical IP over ATM) network based on PVCs.
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.Pp
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An ATM network card (en0 in this example) is configured for IP by something
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like:
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.Pp
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.Dl # ifconfig en0 128.252.200.1 netmask 0xffffff00 up
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.Pp
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A PVC is added with the
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.Dq route
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utility:
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.Pp
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.Dl # route add -iface <remote IP address> -link en0:z.0.x.y
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.Pp
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where x and y are the hexadecimal byte encoding of the VCI to use,
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and z is the byte encoding of the following flags:
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.Pp
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.Bl -tag -width "0x02" -offset indent -compact
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.It 0x01
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use AAL5.
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.It 0x02
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if using AAL5, use an LLC/SNAP header.
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.El
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.Pp
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Thus, parameter 3 means AAL5 and LLC/SNAP encapsulation (this is the required
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setting for interworking with other CLIP clients).
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Note that BPF works only with LLC/SNAP encapsulation.
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.Sh EXAMPLES
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Suppose you have 3 hosts 128.252.200.1, 128.252.200.2 and
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128.252.200.3 connected by ATM through PVCs:
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.Pp
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.Bl -item -offset indent -compact
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.It
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between 128.252.200.1 and 128.252.200.2: 0xc9
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.It
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between 128.252.200.1 and 128.252.200.3: 0xca
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.It
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between 128.252.200.2 and 128.252.200.3: 0xcb
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.El
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.Pp
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To enable the links use the following commands:
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.Pp
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on host 128.252.200.1:
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.Bd -literal -offset indent -compact
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# ifconfig en0 128.252.200.1 netmask 0xffffff00 up
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# route add -iface 128.252.200.2 -link en0:3.0.0.c9
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# route add -iface 128.252.200.3 -link en0:3.0.0.ca
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.Ed
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.Pp
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on host 128.252.200.2:
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.Bd -literal -offset indent -compact
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# ifconfig en0 128.252.200.2 netmask 0xffffff00 up
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# route add -iface 128.252.200.1 -link en0:3.0.0.c9
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# route add -iface 128.252.200.3 -link en0:3.0.0.cb
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.Ed
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.Pp
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on host 128.252.200.3:
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.Bd -literal -offset indent -compact
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# ifconfig en0 128.252.200.3 netmask 0xffffff00 up
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# route add -iface 128.252.200.1 -link en0:3.0.0.ca
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# route add -iface 128.252.200.2 -link en0:3.0.0.cb
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.Ed
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.Pp
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This can also be done in
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.Xr rc.conf 5 :
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.Pp
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on host 128.252.200.1:
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.Bd -literal -offset indent -compact
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network_interfaces="lo0 en0"
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ifconfig_en0="inet 128.252.200.1 netmask 255.255.255.0"
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static_routes="host2 host3"
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route_host2="-iface 128.252.200.2 -link en0:3.0.0.c9"
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route_host3="-iface 128.252.200.3 -link en0:3.0.0.ca"
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.Ed
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.Pp
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on host 128.252.200.2:
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.Bd -literal -offset indent -compact
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network_interfaces="lo0 en0"
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ifconfig_en0="inet 128.252.200.2 netmask 255.255.255.0"
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static_routes="host1 host3"
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route_host1="-iface 128.252.200.1 -link en0:3.0.0.c9"
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route_host3="-iface 128.252.200.3 -link en0:3.0.0.cb"
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.Ed
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.Pp
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on host 128.252.200.3:
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.Bd -literal -offset indent -compact
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network_interfaces="lo0 en0"
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ifconfig_en0="inet 128.252.200.3 netmask 255.255.255.0"
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static_routes="host1 host2"
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route_host1="-iface 128.252.200.1 -link en0:3.0.0.ca"
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route_host2="-iface 128.252.200.2 -link en0:3.0.0.cb"
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.Ed
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.Sh SEE ALSO
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.Xr en 4 ,
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2003-06-17 16:15:47 +00:00
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.Xr hatm 4 ,
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2003-06-23 14:46:12 +00:00
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.Xr fatm 4 ,
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2003-06-13 12:33:33 +00:00
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.Xr natm 4
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.Sh AUTHORS
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.An Chuck Cranor
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of Washington University implemented the NATM protocol layer
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along with the EN ATM driver in 1996 for
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.Nx .
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