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07/07/2003 at 11:47PM PDT, ID: 20671399
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6.8

UDP-Broadcasting --> Winsock.RemoteHost and IPs

Asked by GPrentice00 in VB Controls

Tags: udp

Found a page in the PAQs on making a UDP broadcaster:
http://www.experts-exchange.com/Programming/Programming_Languages/Visual_Basic/Q_20107338.html

Shows that setting the RemoteHost property to "255.255.255.255" is used to broadcast to all.  Similar hits on the web elsewhere.

On my home machine using a broadband router this side of the cablemodem, all our machine IPs are 192.168.0.X, x=1 is the LAN IP address (web-interface to router), and the IP pool uses x=100 to 199.  

Assuming the 255s to be a wildcard when used this way, I tried setting the remotehost property to "192.168.0.255", and my broadcaster worked just the same as with all 255s

My broadcaster will be used in an environment where all computers to be knock-knocked will all be similarly grouped:  A.B.C.x where A,B,C are constant (A,B designating the university, C designating my department), although most of the machines in this block won't be involved in getting the broadcast...  NONE of the machines outside this block will be involved in the broadcast.

Is my Assumption/Result correct:  keeping the ABC parts real and putting the 255 in the end will send the UDP broadcast only to those 250 something machines, and not the rest of the university?  Or did it not matter what I used in my home network setup example, and what works here wont work in the university blocks?

If not, what does the "255.255.255.255" do here?  Can I restrict the broadcast range to only the subnet of our department or will it hit every machine?  Or will "255.255.255.255" only look as far as the dhcp server for the department anyways?

I'm lacking the understanding to googlize my questions properly to get the answers I think I'm looking for...

[+][-]07/09/03 04:20 PM, ID: 8889804

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[+][-]07/09/03 10:47 PM, ID: 8891029

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[+][-]07/10/03 06:15 AM, ID: 8892647

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About this solution

Zone: VB Controls
Tags: udp
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Solution Provided By: y2ksw
Participating Experts: 1
Solution Grade: A
 
 
[+][-]07/10/03 06:28 AM, ID: 8892768

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[+][-]07/10/03 10:41 AM, ID: 8895037

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[+][-]07/10/03 10:46 AM, ID: 8895073

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[+][-]07/10/03 01:21 PM, ID: 8896389

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[+][-]07/10/03 10:29 PM, ID: 8899102

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[+][-]07/10/03 10:35 PM, ID: 8899135

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[+][-]07/10/03 10:43 PM, ID: 8899172

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[+][-]07/11/03 07:56 AM, ID: 8903229

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