MRV Communications LX-4000 Series Technical Information PDF herunterladen (Seite 547)

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D-16 iptables man Pages

LX Series Configuration Guide

POSTROUTING chain. It specifies that the source address

of the packet should be modified (and all future packets

in this connection will also be mangled), and rules should

cease being examined. It takes one option:

--to-source <ipaddr>[-<ipaddr>][:port-port]

which can specify a single new source IP address,

an inclusive range of IP addresses, and optionally,

a port range (which is only valid if the rule also

specifies -p tcp or -p udp). If no port range is

specified, then source ports below 512 will be

mapped to other ports below 512: those between 512

and 1023 inclusive will be mapped to ports below

1024, and other ports will be mapped to 1024 or

above. Where possible, no port alteration will

occur.

DNAT

This target is only valid in the nat table, in the PRE

ROUTING and OUTPUT chains, and user-defined chains which

are only called from those chains. It specifies that the

destination address of the packet should be modified (and

all future packets in this connection will also be man

gled), and rules should cease being examined. It takes

one option:

--to-destination <ipaddr>[-<ipaddr>][:port-port]

which can specify a single new destination IP

address, an inclusive range of IP addresses, and

optionally, a port range (which is only valid if

the rule also specifies -p tcp or -p udp). If no

port range is specified, then the destination port

will never be modified.

MASQUERADE

This target is only valid in the nat table, in the

POSTROUTING chain. It should only be used with dynami

cally assigned IP (dialup) connections: if you have a

static IP address, you should use the SNAT target. Mas

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