Date: Thu, 15 Feb 1996 15:58:26 -0500 From: "Garrett A. Wollman" <wollman@lcs.mit.edu> To: Nate Williams <nate@sri.MT.net> Cc: hackers@FreeBSD.org Subject: Re: Broadcast, Netmask, and other such information Message-ID: <9602152058.AA13534@halloran-eldar.lcs.mit.edu> In-Reply-To: <199602152052.NAA01312@rocky.sri.MT.net> References: <199602152029.NAA01202@rocky.sri.MT.net> <9602152037.AA13188@halloran-eldar.lcs.mit.edu> <199602152052.NAA01312@rocky.sri.MT.net>
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<<On Thu, 15 Feb 1996 13:52:08 -0700, Nate Williams <nate@sri.MT.net> said: >> 10.5.5.31 is not a valid host address. (Neither is 10.5.5.0, which >> you correctly avoided using; it means ``this host''.) > Currently, we are allocated an entire class C (204.182.243.255), and I > get the same results when I ping '204.182.243.0' as when I ping the > broadcast address, '204.182.243.255'. I always understood that > '127.0.0.1' meant ``this host''. Be careful about writing the addresses. What you are allocated is 204.182.243.0/24, which used to be called a class C and is now called a 24-bit network or just a ``/24'' for short. The reason why pinging the zero address acts like a broadcast is because 4.2BSD got the broadcast address wrong, and subsequent versions contained brain-damage which attempts to remain compatible with it. -current has had this brain-damage excised. 127.0.0.1 means `host 1 on network 127'. By convention, network 127 was assigned to the loopback interface. There is no technical reason behind this convention; it could just as easily have been network 69. -GAWollman -- Garrett A. Wollman | Shashish is simple, it's discreet, it's brief. ... wollman@lcs.mit.edu | Shashish is the bonding of hearts in spite of distance. Opinions not those of| It is a bond more powerful than absence. We like people MIT, LCS, ANA, or NSA| who like Shashish. - Claude McKenzie + Florent Vollant
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