Messages in this thread | | | Date | Thu, 25 Oct 2001 11:30:13 -0500 (CDT) | From | "Matthew G. Marsh" <> | Subject | Re: issue: deleting one IP alias deletes all |
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On Tue, 23 Oct 2001, Tim Hockin wrote:
> So we've noticed, and taken issue with this behavior. > > If you have several IP aliases on an interface (eth0:0, eth0:1, eth0:2) you > get inconsistent behavior when downing them. > > * if I 'ifconfig down' eth0:1, I am left with eth0:0 and eth0:2 > * if I 'ifconfig down' eth0:0, eth0:1 and eth0:2 go away, too
Use ip.
> I assert that this should not happen. I have a simple patch to fix this > behavior, but I want to know a few things. > > * Is this supposed to happen? Why? > * Is it correct that both the real interface and the first alias are marked > as primary (! IFA_F_SECONDARY), while all other aliases are secondary? It > seems to me that ALL ALIASES should be secondary. Is this wrong? Why?
iif - using ip then
ip addr add 10.1.1.1/24 dev eth0
creates 10.1.1.1 as a primary address for the 10.1.1.0/24 address space as defined. Now:
ip addr add 10.1.1.2/32 dev eth0
10.1.1.2 in this case IS NOT a secondary alias because it is _not_ within the scope of 10.1.1.0/24 by definition (it is in the scope of 10.1.1.2/32 by definition).
Now try:
ip addr add 10.1.1.3/24 dev eth0
and 10.1.1.3 is a secondary alias by definition as it is within the scope of 10.1.1.0/24
Better yet:
ip addr add 10.1.1.4/25 dev eth0
This defines a third scope on dev eth0 and now:
ip addr add 10.1.1.5/25 dev eth0
defines 10.1.1.5 as a seconday within 10.1.1.0/25
So to summarize we now have:
Three (3) Primary addresses: 10.1.1.1 for scope 10.1.1.0/24 10.1.1.2 for scope 10.1.1.2/32 10.1.1.4 for scope 10.1.1.0/25
Two (2) Secondary addresses: 10.1.1.3 for scope 10.1.1.0/24 10.1.1.5 for scope 10.1.1.0/25
Now let us see what the interactions are:
ip addr del 10.1.1.1/24 dev eth0
Will wipe out both 10.1.1.1 and 10.1.1.3
Make sense now? BTW - don't use ifconfig and coloned addresses (which are deprecated) as you will merely confuse yourself. Remeber that ifconfig = InterFace CONFIGure which has everything to do with Interfaces and very little to do with IP addresses... ;-}
> Can anyone fill me in?
RPDB documentation is your freind.
> Thanks > Tim > -- > Tim Hockin > Systems Software Engineer > Sun Microsystems, Cobalt Server Appliances > thockin@sun.com > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
-------------------------------------------------- Matthew G. Marsh, President Paktronix Systems LLC 1506 North 59th Street Omaha NE 68104 Phone: (402) 932-7250 x101 Email: mgm@paktronix.com WWW: http://www.paktronix.com --------------------------------------------------
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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