probable side effects of deleting interfaces ip addresses(loopback ones) from routing table !

h bagade bagadeh at
Mon Jul 1 08:50:34 UTC 2013

Thanks Alan for your helpful reply.
As in my test cable was always connected, I didn't have any problem pinging
my own interface ip. I think it's better to keep interface loopback ip
rather than deleting them to avoid the problem you mentioned besides
performance reduction.

On Thu, Jun 27, 2013 at 7:35 PM, Alan Somers <asomers at> wrote:

> The network route uses your real interface, eg igb0.  But the
> interface IP's route is bound to lo0.  So if you delete your interface
> route, any packets sent to the interface IP will actually go out the
> real interface.  In an experiment, my ping times suggest that those
> packets are actually going out to the switch and coming back.  So if
> you delete your interface route, you will have reduced performance
> when talking to your interface address, and you'll also be unable to
> talk to your own interface address if your ethernet cable gets pulled
> out.  I wouldn't do it if I were you.
> On Wed, Jun 26, 2013 at 10:35 PM, h bagade <bagadeh at> wrote:
> > On Sat, Jun 22, 2013 at 12:25 PM, h bagade <bagadeh at> wrote:
> >
> >> Hi all,
> >>
> >> I've deleted the interface ip address from routing table and only keep
> the
> >> network address. Nothing is behaving unusual afterwards. I think this
> >> loopback ip address is added for better performance. My question is
> would I
> >> get in to trouble by deleting these ip addresses from routing table or
> >> it's, as I think, just a matter of performance?
> >>
> >> Thanks in advance
> >>
> >
> > I've done further tests after deleting loopback ip addresses and my
> system
> > works correctly without any side effects! Is that really OK with deleting
> > these ip addresses?
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