MRV Communications LX-4000 Series Informações Técnicas descarregar pdf (Página 538)

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iptables man Pages D-7

a user-defined chain (other than the one this rule

is in), one of the special builtin targets which

decide the fate of the packet immediately, or an

extension (see EXTENSIONS below). If this option

is omitted in a rule, then matching the rule will

have no effect on the packet's fate, but the coun

ters on the rule will be incremented.

-i, --in-interface [!] [name]

Optional name of an interface via which a packet is

received (for packets entering the INPUT, FORWARD

and PREROUTING chains). When the "!" argument is

used before the interface name, the sense is

inverted. If the interface name ends in a "+",

then any interface which begins with this name will

match. If this option is omitted, the string "+"

is assumed, which will match with any interface

name.

-o, --out-interface [!] [name]

Optional name of an interface via which a packet is

going to be sent (for packets entering the FORWARD,

OUTPUT and POSTROUTING chains). When the "!" argu

ment is used before the interface name, the sense

is inverted. If the interface name ends in a "+",

then any interface which begins with this name will

match. If this option is omitted, the string "+"

is assumed, which will match with any interface

name.

[!] -f, --fragment

This means that the rule only refers to second and

further fragments of fragmented packets. Since

there is no way to tell the source or destination

ports of such a packet (or ICMP type), such a

packet will not match any rules which specify them.

When the "!" argument precedes the "-f" flag, the

rule will only match head fragments, or unfrag

mented packets.

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