cisco 2948 not allowing "net send" commands through

I have recently started using an app that sends NEt send commands via machine name or domain name across a network.
I have started to think that the switch that the network is plughged into (a straight forward class C) is somehow blocking the net send commands
ther eis no configuration on the switch as it was just plugged in as a dumb switch while the resty of the systems were sorted but never got round to configuring it

would there be any reason a switch would block broadcast or certain rewuests without a config in it?
im pretty sure its not windows this time as we have tried the machines on the same domain ina  different switch and it works - although it is possible these other switches have DNS entries setup as it was another companies switch -

any suggestions as to where to start looking?

thanks
redmayneAsked:
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lrmooreConnect With a Mentor Commented:
Switches don't block broadcasts by default. All storm control is turned off and even if it was enabled a simple net send message wouldn't be enough traffic to trigger it.
I can't think of any reason why changing out the switch to a newer one with all default settings could be causing this issue - save for duplex mismatches on some ports.
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Don JohnstonInstructorCommented:
Is the switch a 2948G-L3?

If so, then it's a Layer 3 switch (basically a router) which will not pass broadcasts.
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redmayneAuthor Commented:
Nah

its a Cisco 2948G-GE-TX
i don't believe that is the router
it has the 400catalyst image anyway
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redmayneAuthor Commented:
Although this does sound like broadcasts are not getting through
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