Evren Yurtesen wrote:
Jeremy Chadwick wrote:
On Tue, Jul 24, 2007 at 03:34:54AM +0300, Evren Yurtesen wrote:
I remember from earlier versions of FreeBSD that it had a
restriction about alias IP netmasks (somewhere in 3.x,4.x days)...
as explained here:
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-virtual-hosts.html
However I tried on the loopback interface to add a 2nd IP with the
same netmask as the original IP and it accepts it fine. (on 6.2)
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet 127.0.0.1 netmask 0xff000000
inet 127.0.0.2 netmask 0xff000000
Is FreeBSD allowing this a bug or ???
It's not a bug. Why did you disregard the instructions, though?
I didnt disregard the instructions. I read somebody suggesting not using
255.255.255.255 in some forum. Then I tried it out and FreeBSD accepted
the netmask for the alias IP.
Why does FreeBSD accept such netmask which can cause problems when
earlier it was rejecting it?
If this is not a bug. What happens if an interface which is
connecting to the machine has 2 IP addresses with same netmask which
is not 255.255.255.255? Does FreeBSD use each IP randomly?
I'm not sure but it is possible that lo0 is treated more like a P2P
interface in which case the netmask is not used in routing decisions.
Don't know, but my guess is no, it probably does not use "each IP
randomly", and I cannot even fathom the network breakage that would
ensue as a result of such.
I understand, I will try to test that sometime to see what FreeBSD does
in this kind of situation.
However, it might be nice if ifconfig did not allow this kind of wrong
setting.
Thanks,
Evren
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