Hi Mark -
I wanted to lear Cocoa development and also needed the same type of
tool. I decided to write a tool and wrote NetCheck as my first
application. ( http://scriptsoftware.com/netcheck ). I had never
done any GUI API development but a lot of client/server socket and
unix systems programming. I had always wanted to tie together a GUI
to app with some client/server socket code. I wrote NetCheck using
BSD Socket API and did not try to learn the CFSocket API. NetCheck
was the first CoCoa app I had written.
As for your question, is your approach to write a network "scanner"
or test a table (or some kind of list) of IP addresses that you've
deemed to be important or that test network up-time. Determining
what your local subnet is and then composing a layer-3 ICMP broadcast
packet is not a very network friendly thing to do on a shared network
and doesn't provide any functionality in regards to UP/DOWN time of
individual IPs. In my opinion, you should build the App such that
you enter IP addresses you want to check and then send the ICMP
packets to them. Therefore, I don't think bonjour should play a role
in an application that test the up/down state of IP devices or a wan/
dsl link.
Anyway, good luck and if you need any help, send me an email.
Dalton Hamilton
On Sep 24, 2005, at 2:42 AM, Mark Dawson wrote:
I'm new to networking (did a little Open Transport many years
back), and would like to create a simple app--a diagnostic that
finds all the nodes on my local network, plus some remote (such as
www.apple.com and www.google.com). The app would then "ping" those
addresses on command--just a quick way to verify whether I've lost
my DSL connection or something internal to my network.
I found the "simplePing" program that works to ping hosts (and
figures out what the IP address is of "www.apple.com"). However, I
wasn't sure how to figure out the local network addresses. I
wasn't sure if Bonjour was the way to go. Any ideas?
I'd also like some pointers on where to look to learn more about
Mac (or general) networking--I'm not sure where a starting point
is. I know I need to understand better sockets, but I'm sure
there's more :) I picked my "network" ping app more because I
could find it useful (maybe there already is something like that?)
but more importantly, I thought it would be a good introduction
into networking…
Thanks!
Mark _______________________________________________
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