Moxa-technologies UC-7110 Manual de usuario descargar pdf (Pagina 36)

UC-7110 Series User’s Manual Configuring UC-7110

4-4

OUTPUT chain—produces local packets

sub-tables

Source NAT (SNAT)—changes the first source packet IP address

Destination NAT (DNAT)—changes the first destination packet IP address

MASQUERADE—a special form for SNAT. If one host can connect to the Internet, then

other computers that connect to this host can connect to the Internet when the computer

does not have an actual IP address.

REDIRECT—a special form of DNAT that re-sends packets to a local host independent

of the destination IP address.

C. Mangle Table—includes two chains

PREROUTING chain—pre-processes packets before the routing process.

OUTPUT chain—processes packets after the routing process.

It has three extensions—TTL, MARK, TOS.

The following figure shows the IPTABLES hierarchy.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 63 64

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Moxa-technologies UC-7110 Manual de usuario Pagina 36