nomad@mist.cs.orst.edu (Lee Vincent Damon) (12/31/87)
I have just finished reading rfc950 (finally). I notice in this
doc that the "zero address" of each subnet is supposed to remain
unused, along with the "all-one" address. When I issued numbers
on my subnet I knew about the all ones, but not about the zeros. None
of our machines have complained so I was wondering if the zero's
"this net" requirement has been removed and we just have an old doc?
Perhaps I am still misinterpreting something, so here is the data and
you can see for yourself:
Our net is a class B (128.193), we used 5 bits for subnetting
(mask is 255.255.248.0 or 0xffff8000), with the lowest bit
of that mask held in reserve (so nets are assigned on the higher
four bits, leaving the lowest as 0 in all subnets) in case we need to
"fine tune." The subnet for the CS department is 00100xxx or 32 to 39.
We have no problem (well, not much anyway) with the broadcast address
of 128.193.39.255, but some of our machines are in the 128.193.32 subnet
(all of our CPUs to be exact). The e-net is one cable, but I have all classes
of machines defined differently (CPUs are 128.193.32.x, Mac's are 33.x,
terminal servers are 34.x and misc is 35.x, we aren't using 36.x thru 38.x). As
I said none of our machinery is complaining about being in the "0 address"
of our subnet (I didn't use 128.193.x.0 or 128.193.x.255 at all). Is there
a problem that I just don't know about, or is what I am doing relatively
safe? (If there is a problem and I was totally wrong with my assignments,
please tell me why it still worked...). I should probably add that we are
using a Cisco AGS router to interface our subnet to the rest of the campus
net (& the Internet) and it is set up to do proxy-arping.
We have a mix of 4.3 and 4.2 machines here, some know about subnetting,
some don't. Any insight on this would be appreciated.
(The above address might be wrong, please use the ones below...)
ADVthanksANCE,
nomad
-------------------------
LEE DAMON FidoNet: 152/201 (The Castle) - (503) 757-8841
nomad@cs.orst.edu Internet: nomad@cs.orst.edu
UUCP : {hp-pcd,tektronix}!orstcs!nomad
"Say what you like, the bicycle has a great past ahead of it!"