Quoting mulyadi santosa <[EMAIL PROTECTED]>:
> CMR> benar pake NAT, tepatnya lagi menggunakan DNAT.
> CMR> misal:
>
> anda benar, pake DNAT
>
> CMR> $IPT -t nat -A PREROUTING -p tcp -d $SERVER_SMTP --dport 110 -j DNAT \
> CMR> --to-destination $SERVER_POP:110
> bisa dijelaskan knp pake PREROUTING?? saya baca HOWTO tapi masih butuh
> pencerahan lagi :-)
karena begini, man iptables:
DNAT
This target is only valid in the nat table, in the PREROUTING and OUT-
^^^^^^^^^^
PUT 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
mangled), 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 inclu-
sive 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.
itu alasannya.
tapi kalau pingin lebih jelas, lihat lagi urutan proses iptables, dari paket
yang mau masuk sampai yang dikeluarkan dari mesin.
Cecep Mahbub
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