Re: Are IP addresses where the last byte is 255 invalid?

DAVID BALAZIC (david.balazic@uni-mb.si)
Tue, 13 Jan 1998 14:49:26 +0100 (MET)

Generally , IP adresses , where the host-address part are all 1, are
used as the broadcast address.
But this is AFAIK not mandatory, U could use any other address as
broadcast.

But broken software may rely on the default behaviour and may
not work correctly with 'weird' settings.

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As for Your mail :
please use full IPs ( 212.0 and 215.255 - what are those ??? )
they are probably the last two bytes of addresses , right ?


and also use numerical addresses , not DNS names ( gw-ostenfeld.k- ,
gw-bergsoe.k-ne, carlsberg5.kamp    etc. )



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Now the answers :


1. If all Your linux boxes respond to  212.255 , then they
obviously think that this is the broadcast address, which 
it is off course not .
Check their network setup !
if U dont specify the broadcast address explicitly for
the ifconfig command then it will pick x.x.x.255 for C class
networks, but isn't correct for Your network !


Weird that they dont respond to ping from ormen ...


Do they correctly respond to the real broadcast address 215.255 ???
 

--
David Balazic , student
E-mail: David.Balazic@uni-mb.si       |             sLOVEnija
http://www.uni-mb.si/~uel003r2a
Computer: Amiga 1200 + Quantum LPS-340AT

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