схема движения пакетов в ядре linux
Применимость: Linux
----
Network
-----------+-----------
|
+--------------------------+
+-------+-------+ +---------+---------+
| IPCHAINS | | IPTABLES |
| INPUT | | PREROUTING |
+-------+-------+ | +-------+-------+ |
| | | conntrack | |
| | +-------+-------+ |
| | | mangle | | <- MARK WRITE
| | +-------+-------+ |
| | | IMQ | |
| | +-------+-------+ |
| | | nat | | <- DEST REWRITE
| | +-------+-------+ | DNAT or REDIRECT or DE-MASQUERADE
| +---------+---------+
+------------+-------------+
|
+-------+-------+
| QOS |
| INGRESS |
+-------+-------+
|
packet is for +-------+-------+ packet is for
this machine | INPUT | another address
+--------------+ ROUTING +--------------+
| | + PDBB | |
| +---------------+ |
+-------+-------+ |
| IPTABLES | |
| INPUT | |
| +-----+-----+ | |
| | mangle | | |
| +-----+-----+ | |
| | filter | | |
| +-----+-----+ | |
+-------+-------+ |
| +---------------------------+
+-------+-------+ | |
| Local | +-------+-------+ +-------+-------+
| Process | | IPCHAINS | | IPTABLES |
+-------+-------+ | FORWARD | | FORWARD |
| +-------+-------+ | +-----+-----+ |
+-------+-------+ | | | mangle | | <- MARK WRITE
| OUTPUT | | | +-----+-----+ |
| ROUTING | | | | filter | |
+-------+-------+ | | +-----+-----+ |
| | +-------+-------+
+-------+-------+ | |
| IPTABLES | +---------------------------+
| OUTPUT | |
| +-----------+ | |
| | conntrack | | |
| +-----+-----+ | |
| | mangle | | <- MARK WRITE |
| +-----+-----+ | |
| | nat | | <-DEST REWRITE |
| +-----+-----+ | DNAT or REDIRECT |
| | filter | | |
| +-----+-----+ | |
+-------+-------+ |
| |
+----------------------+----------------------+
|
+------------+------------+
| |
+-------+-------+ +---------+---------+
| IPCHAINS | | IPTABLES |
| OUTPUT | | POSTROUTING |
+-------+------- | +-------+-------+ |
| | | mangle | | <- MARK WRITE
| | +-------+-------+ |
| | | nat | | <- SOURCE REWRITE
| | +-------+-------+ | SNAT or MASQUERADE
| | | IMQ | |
| | +-------+-------+ |
| +---------+---------+
+------------+------------+
|
+------+------+
| QOS |
| EGRESS |
+------+------+
|
-----------+-----------
Network
