ip directed-broadcast

hi soulja,

yes ive read brief comments about (ip directed-broadcast) being used for (wake on lan) implementation.

yes i also realise after reading my previous url it can come under the category of (security) so doing (no ip directed-broadcast) is used although most routers apparently have it disabled automatically - no problem.

for my own clarification - i suppose from my point of view, if i purchased a device that did not by default set (no ip directed-broadcast)...

...and i was not using any routing protocols or any other command to block a ping command from source to destn for example..

...but due to a new implementation i wanted to do a ping test confirming end to end connectivity from source to destination i presume the ping would be successful....?

...and after that test then presumably i could then add (no ip directed-broadcast) on the interfaces required to ensure no hacker could then try and do something negative like bring my network down.

?

hi soulja,

question 1.  you say a "ping is not a broadcast", but i assumed that when someone decides to ping an actual broadcast address like below as just one example then that was how ?

ping 192.168.1.255

i can appreciate what it is but this is where i fall short of putting it into practical terms.!

hi noci,

question 1.  please explain what:  ping x.x.x.x -b for clarity  ?

question 2.  what is ymmv on the os involved though.  linux + iputils has this behaviour  ?

question 3.  yes i know ping is unicast, just trying to understand how a hacker can prompt a broadcast  ?

hi,  im not explaining myself correctly so i apologise.

the reason my question has come about is regarding (no ip directed-broadcast & ip directed-broadcast) which i understand as i have been reading my main question url..!

how does a host pc enable a broadcast from source to destination, although i understand what the router does which is send unicast through all routers and the last router that recognises the broadcast address sends a broadcast, but what is triggered from the host pc point of view, is it something manual ?

or is it when a host is part of a dynamic network and maybe an email is sent to another part of a subnetted network then (ip directed-broadcast) comes into play, is that it  ?

hi and thanks for that advice.  i understand some of what is stated and some of it is confusing but i will cut & paste this info and read it every so often to get a grip on the understanding.

advice appreciated!!