iptables mangle and NAT notes

9 07 2008

PREROUTING in nat table: DNAT, REDIRECT
POSTROUTING in nat table: SNAT/MASQUERADE

PREROUTING in mangle table: alter routing (e.g. source-based routing)
FORWARD in mangle table: traffic shaping for tc (flowid)

In MikroTik RouterOS, /ip firewall nat:
srcnat chain = PREROUTING
dstnat chain = POSTROUTING

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Categories : Linux, Netfilter, Networking, Technical