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Top Forums UNIX for Beginners Questions & Answers Awk: group multiple fields from different records Post 303019792 by beca123456 on Friday 6th of July 2018 02:13:33 PM
Old 07-06-2018
Quote:
The following variant does a precise lookup (to supress duplicates)
I don't understand this statement. Both solutions seem to work just fine.
Is one more prone to errors than the other?

Last edited by beca123456; 07-06-2018 at 03:53 PM..
 

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FILTER 
BACKENDS(7) Miscellaneous Information Manual FILTER BACKENDS(7) NAME
filter_backends - output drivers for the filtergen packet filter compiler INTRODUCTION
This document describes the status and feature-set of the currently available filtergen backends. IPTABLES
Most development is done first against the iptables driver. It supports reject, masquerading, transparent proxying, logging (with text) and sub-groups, all of which should work fine (though the latter has only recently been fixed). IPCHAINS
The ipchains driver supports all of the above features, too. Its state model is much weaker though, of course. The forwarding support should work OK, though it is not possible to support "local"-only packets. IPFILTER
The ipfilter backend is incomplete. It supports accept, drop, reject and logging, but not masq, transproxy or sub-groups. It should be easy for someone with knowledge of ipfilter to add support for the other features. Options for OpenBSD "pf" features and syntax would be nice, too. It has received no testing; I don't even know if the generated filters are syntactically correct. CISCO
The cisco driver is in roughly the same sort of state as the ipfilter one. Additionally, because of the limitations of IOS ACLs, it sup- ports only a limited set of features. It cannot support reject or transparent proxying, and may not be able to support masquerading either. An option for reflexive (stateful) ACLs would be very useful. I understand that Cisco PIX firewalls use a variant of this syntax -- it would be very nice to support them too. SEE ALSO
filtergen(8), filter_syntax(5) January 7, 2004 FILTER BACKENDS(7)
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