Re: limit on number of logical interfaces

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On Wed, 8 Aug 2007 10:30:51 +0530
"pankaj jain" <jainp1979@xxxxxxxxx> wrote:

> On 8/8/07, Stephen Hemminger <shemminger@xxxxxxxxxxxxxxxxxxxx> wrote:
> > On Tue, 7 Aug 2007 19:12:25 +0530
> > "pankaj jain" <jainp1979@xxxxxxxxx> wrote:
> >
> > > Hi
> > > What is the limit on number of logical interfaces per hardware
> > > interface in linux.
> > > I am using 2.6 kernel.
> >
> > Kernel addressable memory is limit. Managing 1000's of interfaces can
> > be a pain and some user space tools may have problems, but kernel
> > is fine.
> >
> 
> I wanted to know the theoritical limit on this.
> since for interface indexing we use an integer can I expect that the
> max of an integer is the limit?

Yes ifindex is int, so that would be INT_MAX, but you would run of kernel
addressable memory first since on 32 bit platforms you can only use up
to 1G of memory for kernel data.
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