11-21-2014
Thanks so much for taking the time to help me.
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NAT action in tc(8) Linux NAT action in tc(8)
NAME
nat - stateless native address translation action
SYNOPSIS
tc ... action nat DIRECTION OLD NEW
DIRECTION := { ingress | egress }
OLD := IPV4_ADDR_SPEC
NEW := IPV4_ADDR_SPEC
IPV4_ADDR_SPEC := { default | any | all | in_addr[/{prefix|netmask}]
DESCRIPTION
The nat action allows to perform NAT without the overhead of conntrack, which is desirable if the number of flows or addresses to perform
NAT on is large. This action is best used in combination with the u32 filter to allow for efficient lookups of a large number of stateless
NAT rules in constant time.
OPTIONS
ingress
Translate destination addresses, i.e. perform DNAT.
egress Translate source addresses, i.e. perform SNAT.
OLD Specifies addresses which should be translated.
NEW Specifies addresses which OLD should be translated into.
NOTES
The accepted address format in OLD and NEW is quite flexible. It may either consist of one of the keywords default, any or all, represent-
ing the all-zero IP address or a combination of IP address and netmask or prefix length separated by a slash (/) sign. In any case, the
mask (or prefix length) value of OLD is used for NEW as well so that a one-to-one mapping of addresses is assured.
Address translation is done using a combination of binary operations. First, the original (source or destination) address is matched
against the value of OLD. If the original address fits, the new address is created by taking the leading bits from NEW (defined by the
netmask of OLD) and taking the remaining bits from the original address.
There is rudimental support for upper layer protocols, namely TCP, UDP and ICMP. While for the first two only checksum recalculation is
performed, the action also takes care of embedded IP headers in ICMP packets by translating the respective address therein, too.
SEE ALSO
tc(8)
iproute2 12 Jan 2015 NAT action in tc(8)