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ip zero-broadcast

Marcus J
Frequent Advisor

ip zero-broadcast

What does this command do?
anyone that have some ideas...
4 REPLIES
Matt Hobbs
Honored Contributor

Re: ip zero-broadcast

From what I understand, it's there to support an obsolete form of broadcasting. Today broadcast traffic is sent to 255.255.255.255, previously it could be sent to 0.0.0.0.
rick jones
Honored Contributor

Re: ip zero-broadcast

Matt is, I believe, correct. Even ten years ago there should have been precious little out there still trying to send broadcast traffic to 0.0.0.0, so today it should be virtually non-existant.
there is no rest for the wicked yet the virtuous have no pillows
Mohieddin Kharnoub
Honored Contributor

Re: ip zero-broadcast

Hi

Some older versions of Unix still using an all zero broadcast 0.0.0.0 instead of 255.255.255.255

We are in the phase of moving to IPv6, but we can't ignore these ancient technologies :)

Good Luck !!!
Science for Everyone
rick jones
Honored Contributor

Re: ip zero-broadcast

I don't think that "older" quite captures it. "Ancient" would be more correct IMO. I think you have to go back before BSD 4.3 to find an OS which used an all-zeros broadcast.
there is no rest for the wicked yet the virtuous have no pillows