how is it possible to post anonymous in a newsgroup?

From: 4cray (4cray_at_chello.at)
Date: 11/20/03 

Date: Thu, 20 Nov 2003 21:49:34 GMT

hello, i have read the properties and found this description:

Path:
news.chello.at!newsfeed01.chello.at!feed.news.nacamar.de!newsfeed01.sul.t-on
line.de!newsmm00.sul.t-online.com!t-online.de!news.t-online.com!not-for-mail
From: Florian Weingarten <fw@go.cc>
Newsgroups: de.comp.security.firewall
Subject: Re: Hilfe, Firewall oder was?
Date: Mon, 17 Nov 2003 19:16:03 +0100
Organization: T-Online
Lines: 11
Message-ID: <slrnbri433.bog.fw@hackvalue.de>
References: <bpb32s$1ni$02$1@news.t-online.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-Trace: news.t-online.com 1069092963 00 2224 AF4zVwiqArgui5 031117 18:16:03
X-Complaints-To: usenet-abuse@t-online.de
X-ID: rwDUZ6ZXYerMwBrCZ0HVcG5cOzgMpF4rDG2bnaXk29hoTr9UCom9El
User-Agent: slrn/0.9.7.4-jwk6 (Linux)
Xref: newsfeed01.chello.at de.comp.security.firewall:65668
X-Received-Date: Mon, 17 Nov 2003 19:16:12 MET (news.chello.at)

i can't find the IP? it seems to be an anonymous post, and how die he make
this post?

GreetingX

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