nixCraft

Is there any software that automatically make a line diagram or diagram for current local network infrastructure

You can install dia software under Linux or windows.

Dia is a nicely presented drawing program designed to simplify the task of preparing a variety of different types of diagrams including UML, entity relationship, flowchart, electronic circuit, and network diagrams.
http://dia-installer.sourceforge.net/ : windows version
http://www.gnome.org/projects/dia/ : UNIX/Linux version

Tgif - The Tgif drawing program has some unique and interesting features that make it useful for network diagrams. http://sourceforge.net/projects/tgif

Xfig - The Xfig drawing package is a general-purpose vector drawing package. Its interface provides all the sorts of features I think are important for network diagramming packages including a "Smart Links" features which allows lines/links between symbols to be move when either symbol moves. The Xfig interface is clean and easy to learn once you become accustomed to the lack of a "select" tool; each tool has an built-in select function.
ftp://ftp.x.org/contrib/applications...ng_tools/xfig/

I recommend using xfig or dia both are quite good and can be install using apt-get or yum command.

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agreed of dia, tgif, xfig. we also got graphviz. but the question was ?
"Is there any software that automatically make a line diagram or diagram for current local network infrastructure"
looks like you gave the butter but took the bread away or burnt the bread in the process of baking it.
how will you know about the network?
you may use cheop-ng or nmap for LAN or other network asset discovery protocol and oslrp for wireless protocol. how will you do an asset inventory list?
hehe. hope this helps.

Have you looked into lanmap? It is fired off from the command line and just collects ips/mac addresses. It creates a file, lanmap.png by default and puts it in your home directory. The longer it runs, the more it discovers and replaces the older version of lanmap.png on its own.

See attached....

Attached Images

lanmap.jpg (276.5 KB, 26 views)

I would recommend Ubuntu. The have some an awesome Wiki an how to do just about everything.....

My progression was Redhat(before fedora days)->Suse->Ubuntu 6.06-Present....

You can download the Ubuntu install CD and take it for a test run on any machine without wiping your old OS, which is nice. I believe the option is Try Ubuntu' or something. Like Knoppix, Ubuntu is a live CD.