06-24-2013
No more than without the proxy server. You may lose some identity information if the NAT assigns addresses and ports from a pool. The obvious place to put a proxy is on the firewall network boundary, that is to say, within the local no-NAT domain, so you get the identity right, and let the proxy have access, perhaps bypassing NAT/that-firewall. Of course, if you serve many such behind-NAT spaces, you need a NIC or tunnel so they can all locally connect to the proxy, or many proxy servers. If the power/resources are right, a proxy on a firewall with a local DNS server on the firewall is not a bad model -- just a different way through the same firewall. The proxy server is a very heavy DNS user, so a local DNS cache can be a nice idea. There is a wonderful feeling when you prevent a packet from needing to go out on a network!
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LEARN ABOUT DEBIAN
welf_proxy2dlf
WELF_PROXY2DLF.IN(1) LogReport's Lire Documentation WELF_PROXY2DLF.IN(1)
NAME
welf_proxy2dlf - convert logs in WebTrends Enhanced Log Format to proxy DLF
SYNOPSIS
welf_proxy2dlf file
DESCRIPTION
welf_proxy2dlf converts firewall logs in the WebTrends Enhanced Log Format into the proxy DLF.
That format is defined at the following URL: http://www.netiq.com/partners/technology/welf.asp
This converter also supports the SonicWall extensions.
A list of firewall products that supports that format can be found at the following URL: http://www.netiq.com/products/fwr/compatible.asp
EXAMPLES
To process a log as produced by a WebTrends proxy:
$ welf_proxy2dlf < welf-proxy.log
welf_proxy2dlf will be rarely used on its own, but is more likely called by lr_log2report:
$ lr_log2report welf_proxy < /var/log/welf-proxy.log
IMPLEMENTATION NOTES
Welf log files contains information about many applications: proxies, packet filters, IDS. IDS and packet filters information is handled by
the firewall superservice, whereas the proxy information is handled by the proxy supersevice.
This converter will only convert records with a proto, src and dst field. All other records are ignored (they won't be ignored by the
firewall superservice).
SEE ALSO
Lire::WELF(3) welf2dlf(1)
AUTHORS
Francis J. Lacoste <flacoste@logreport.org>
VERSION
$Id: welf_proxy2dlf.in,v 1.8 2006/07/23 13:16:36 vanbaal Exp $
COPYRIGHT
Copyright (C) 2001 Stichting LogReport Foundation LogReport@LogReport.org
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program (see COPYING); if not, check with
http://www.gnu.org/copyleft/gpl.html.
Lire 2.1.1 2006-07-23 WELF_PROXY2DLF.IN(1)