multiple nslookups Post: 302451303

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tc-nat

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)

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