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When can ipAdEntBcastAddr be zero?
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Jon Sharp  
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 More options Aug 29 2011, 1:40 pm
Newsgroups: comp.protocols.snmp
From: Jon Sharp <pra...@gmail.com>
Date: Mon, 29 Aug 2011 10:40:04 -0700 (PDT)
Local: Mon, Aug 29 2011 1:40 pm
Subject: When can ipAdEntBcastAddr be zero?
In RFC1213 (MIB-2), when can ipAdEntBcastAddr be zero? The description
of this field is:

ipAdEntBcastAddr OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The value of the least-significant bit in the
IP
                      broadcast address used for sending datagrams on
                      the (logical) interface associated with the IP
                      address of this entry.  For example, when the
                      Internet standard all-ones broadcast address is
                      used, the value will be 1.  This value applies
to
                      both the subnet and network broadcasts addresses
                      used by the entity on this (logical) interface."
              ::= { ipAddrEntry 4 }

After a bit of web browsing, I see discussion that some old networks
used zero's instead of one's for the broadcast address. Does
ipAdEntBcastAddr exist to support these old networks? If I don't care
about these networks, can I hardcode ipAdEntBcastAddr to 1?

Thanks
Jon.


 
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Jürgen Schönwälder  
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 More options Sep 8 2011, 5:31 pm
Newsgroups: comp.protocols.snmp
From: "Jürgen Schönwälder" <scho...@ibr.cs.tu-bs.de>
Date: 8 Sep 2011 21:31:05 GMT
Local: Thurs, Sep 8 2011 5:31 pm
Subject: Re: When can ipAdEntBcastAddr be zero?

Jon Sharp <pra...@gmail.com> wrote:

> After a bit of web browsing, I see discussion that some old networks
> used zero's instead of one's for the broadcast address. Does
> ipAdEntBcastAddr exist to support these old networks?

Yes. Note that the original definition of this is also some
20 years old now.

> If I don't care about these networks, can I hardcode ipAdEntBcastAddr
> to 1?

Yep.

/js

--
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1, 28759 Bremen, Germany
Fax:   +49 421 200 3103         <http://www.jacobs-university.de/>


 
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