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net send * and net send across subnets

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  • net send * and net send across subnets

    Where I work people tend to use windows messenger service alerts or "net send" for quick messages which is very useful. One very useful thing is to do
    Code:
    net send * somemessage
    to send messages to everyone. However, this only sends it to all the machines on the same subnet. People in branch offices don't get the net send message. We are in a single domain environment across sites with Active Directory sites configured and a domain controller at each site. Technically doing a
    Code:
    net send /domain somemessage
    should send it to every machine in the domain but in reality it still only goes to every machine on the same subnet.

    Questions:

    1. Is it possible using the standard windows messenger service alerts to send to everyone across all subnets?
    2. Is it possible using the standard windows messenger service alerts to send to people in another specific subnet? (eg. my x.x.x.x subnet or my AD site or something)

  • #2
    Re: net send * and net send across subnets

    The problem is probably due to the fact that the net send message is a broadcast and routers typically block broadcast traffic. You could try allowing broadcast traffic across the routers but that is probably not advisable as you would flood each subnet with broadcasts from every other subnet as well as waste bandwidth and cpu cycles on the routers. Have you thought about implementing a LAN based instant messaging program?

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    • #3
      Re: net send * and net send across subnets

      we have jabber, we just don't use it... we prefer net sends.

      I'm of course not going to enable broadcast traffic across routers.

      At the moment I'm leaning towards writing a wsh script to enumerate all machines across subnets and then loop through net sending each machine directly which works...

      unless anyone has any better ideas?

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