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NG_NAT(4) FreeBSD Kernel Interfaces Manual NG_NAT(4) NAME ng_nat -- NAT netgraph node type SYNOPSIS #include <netgraph/ng_nat.h> DESCRIPTION An ng_nat node performs network address translation (NAT) of packets passing through it. A nat node uses libalias(3) engine for packet alias- ing. At this moment it supports only the basic functionality of the library. HOOKS This node type has two hooks: out Packets received on this hook are considered outgoing and will be masqueraded to a configured address. in Packets coming on this hook are considered incoming and will be dealiased. CONTROL MESSAGES This node type supports the generic control messages, plus the following: NGM_NAT_SET_IPADDR (setaliasaddr) Configure aliasing address for a node. After both hooks have been connected and aliasing address was configured, a node is ready for aliasing operation. SHUTDOWN This node shuts down upon receipt of a NGM_SHUTDOWN control message, or when both hooks are disconnected. EXAMPLES In the following example, the packets are injected into a nat node using the ng_ipfw(4) node. # Create NAT node ngctl mkpeer ipfw: nat 60 out ngctl name ipfw:60 nat ngctl connect ipfw: nat: 61 in ngctl msg nat: setaliasaddr x.y.35.8 # Divert traffic into NAT node ipfw add 300 netgraph 61 all from any to any in via fxp0 ipfw add 400 netgraph 60 all from any to any out via fxp0 # Let packets continue with after being (de)aliased sysctl net.inet.ip.fw.one_pass=0 The ng_nat node can be inserted right after the ng_iface(4) node in the graph. In the following example, we perform masquerading on a serial line with HDLC encapsulation. /usr/sbin/ngctl -f- <<-SEQ mkpeer cp0: cisco rawdata downstream name cp0:rawdata hdlc mkpeer hdlc: nat inet in name hdlc:inet nat mkpeer nat: iface out inet msg nat: setaliasaddr x.y.8.35 SEQ ifconfig ng0 x.y.8.35 x.y.8.1 SEE ALSO libalias(3), ng_ipfw(4), natd(8), ngctl(8) HISTORY The ng_nat node type was implemented in FreeBSD 6.0. AUTHORS Gleb Smirnoff <glebius@FreeBSD.org> FreeBSD 6.0 May 6, 2005 FreeBSD 6.0
NAME | SYNOPSIS | DESCRIPTION | HOOKS | CONTROL MESSAGES | SHUTDOWN | EXAMPLES | SEE ALSO | HISTORY | AUTHORS
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