Dia and sybols for network items

[Harald Barth <haba pdc kth se>]

I want to use Dia to draw networks with switches and routers and
network clouds. I have found the library with the handful of basic
network symbols but I have not figured out how to modify these symbols
to better fit my needs. For example would it be nice to include a name
field in the router symbol. Can you point me in the right direction or
give me a "these steps you go through to modify a symbol" intro? Or
maybe someone allready made this great network symbol library and
wants to share?

Thanks in advance,
Harald.