[lkml]   [2000]   [Jan]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: all zeroes/all ones used in host IP's...
MD> Actually, if you read the RFC 1122 section you would indeed find that
MD> for you example you get

MD> Host-number = 0x02
MD> Subnet-number = 0x0000
MD> Network-number = 0x17
How come? It reads:

Q> We now summarize the important special cases for Class A, B,
Q> and C IP addresses, using the following notation for an IP
Q> address:
Q>{ <Network-number>, <Host-number> }
Q>{ <Network-number>, <Subnet-number>, <Host-number> }
No room for class number so the class number is contained in the netowrk
number. The following paragraph also says this indirectly:

Q> The <Network-number> is administratively assigned so that
Q> its value will be unique in the entire world.

So the can't be two 1's in different classes.

Meelis Roos (

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:56    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean