On Mon, 6 Apr 2009, Randall Stewart wrote:
I presume you meant "NOT 10.2/15" here? Correct me if I'm wrong, but that's
what I gathered by the discussion of "the bug" in the previous thread.
It would have actually done any number of ones... basically looking at the
bottom number of 0 bits and that would be the / value.
So depending on what number you put with 10.x (for x) you could get a
variety of results..
10.2 would == 10.2/17
10.4 would == 10.2/18
etc.
This is not the correct behavior.. even though it might be technically right
with regard to CIDR.
Now as far as the old class based routings go.. this is a problem since the
two schemes are at odds.
Perhaps I'm sort of old-fashioned, but I would generally expect:
(1) No netmask specified -- use class to determine netmask
(2) netmask specified using -net 192.168/20 -- use /20
(3) netmask specified using -netmask -- use the -netmask argument.
I guess I just don't administer routers very much anymore, but is using the
last set bit a commonly used way to name networks these days, as opposed to
explicitly setting the netmask with /whatever?
Robert N M Watson
Computer Laboratory
University of Cambridge
We have for a long time had doing
route add -net 10.2.0.0 be equal to adding 10.2/16
But if you follow the old Class based routing then
the upper 4 bits of the address needs to be examined to
determine if its a /8, /16 etc.
That is incorrect in a CIDR world.. but I don't see a way
to make the two schemes work together. And since previous to 7.1
the above worked.. I think this last fix is the right approach..
R
Need to explore the non-cidr address issue. The two
may not be seperable..
MFC after: 1 week
Modified:
head/sbin/route/route.c
Modified: head/sbin/route/route.c
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=====================================================================
--- head/sbin/route/route.c Mon Apr 6 14:12:22 2009 (r190774)
+++ head/sbin/route/route.c Mon Apr 6 14:27:28 2009 (r190775)
@@ -808,15 +808,15 @@ inet_makenetandmask(net, sin, bits)
* CIDR address.
*/
if ((bits == 0) && (addr != 0)) {
- int i, j;
- for(i=0,j=1; i<32; i++) {
+ u_long i, j;
+ for(i=0,j=0xff; i<4; i++) {
if (addr & j) {
break;
}
- j <<= 1;
+ j <<= 8;
}
/* i holds the first non zero bit */
- bits = 32 - i;
+ bits = 32 - (i*8);
}
mask = 0xffffffff << (32 - bits);
--
Coleman Kane
------------------------------
Randall Stewart
803-317-4952 (cell)
803-345-0391(direct)
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