Subject: Re: [vserver] need to listen to many multicast addresses
From: petar hitij <Petar.Hitij@gov.si>
Date: Wed, 01 Aug 2012 13:46:12 +0200

Thank you Herbert, I am almost sure I have the hardwired limit.

Will look into the options you have suggested.


Regards
Petar

On Wed, Aug 01, 2012 at 01:21:46PM +0200, Herbert Poetzl wrote:
> On Wed, Aug 01, 2012 at 11:34:23AM +0200, Petar Hitij wrote:
> > Hello,
> 
> > I need to listen to many multicast addresses in a vserver. 
> > I can use max 16 ip numbers in /etc/vservers/vservername/interfaces/. 
> 
> > The host is running an older Debian kernel 2.6.18.
> 
> first you have to figure out _what_ Linux-VServer patch was
> used in that kernel, because if it actually is a 2.6.18 with
> unmodified patches it must be vs2.0, vs2.1 or vs2.2, which
> all have a hardwired kernel limit of 16 IPs for the network
> isolation context.
> 
> you can grep for NB_IPV4ROOT in the kernel source, this will
> give you the limit if present.
> 
> > If possible without upgrade :).
> 
> you can always backport changes from vs2.3 or simply raise
> the hardcoded limit to your requirements, but in any case
> you need to rebuild the kernel.
> 
> HTH,
> Herbert
> 
> > Regards
> > Petar Hitij
> 
> > # vserver-info
> > Versions:
> >                    Kernel: 2.6.18-6-vserver-amd64
> >                    VS-API: 0x00020002
> >              util-vserver: 0.30.215; Jun 18 2010, 13:35:17
> > 
> > Features:
> >                        CC: gcc, gcc (Debian 4.4.4-5) 4.4.4
> >                       CXX: g++, g++ (Debian 4.4.4-5) 4.4.4
> >                  CPPFLAGS: ''
> >                    CFLAGS: '-Wall -g  -O2 -std=c99 -Wall -pedantic -W
> > -funit-at-a-time'
> >                  CXXFLAGS: '-g -O2 -ansi -Wall -pedantic -W
> > -fmessage-length=0 -funit-at-a-time'
> >                build/host: x86_64-pc-linux-gnu/x86_64-pc-linux-gnu
> >              Use dietlibc: yes
> >        Build C++ programs: yes
> >        Build C99 programs: yes
> >            Available APIs: v13,net,v21,v22,v23,netv2
> >             ext2fs Source: e2fsprogs
> >     syscall(2) invocation: alternative
> >       vserver(2) syscall#: 236/glibc
> >                crypto api: nss
> >           python bindings: no
> >    use library versioning: yes
> > 
> > Paths:
> >                    prefix: /usr
> >         sysconf-Directory: /etc
> >             cfg-Directory: /etc/vservers
> >          initrd-Directory: $(sysconfdir)/init.d
> >        pkgstate-Directory: /var/run/vservers
> >           vserver-Rootdir: /var/lib/vservers