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Top Forums UNIX for Dummies Questions & Answers Slow from static IP ... fast from NAT address Post 302107761 by gseyforth on Tuesday 20th of February 2007 02:06:13 PM
Old 02-20-2007
Slow from static IP ... fast from NAT address

Has anyone had an issue where:

If I telnet into a unix machine on my network, from within my natted address,
there is no speed issue.

When I telnet to the same machine using the static address, it is very very
slow.

This SCO 5.06. There is no nameserver running.

Please help. I have outside offices who are running very very slow.

Thank you!
 

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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)
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