[Pacemaker] subnetmask for virtual cluster ip / ipaddr2

Dejan Muhamedagic dejanmm at fastmail.fm
Tue Apr 26 15:30:59 EDT 2011


On Wed, Apr 13, 2011 at 07:41:23PM +0200, Felix Reinel wrote:
> Dear list,
> the default subnet mask for an virtual ip (we use the IpAddr2 resource)
> seems to be /32.

The subnet mask should be deducted from the network interface on
which the virtual IP address is created. Otherwise, it can be
specified using a parameter (cidr_netmask). See

crm ra info IPaddr2



> In our setups we use those virtual ip addresses on
> active/passive two node cluster setups. I have been asked if that should
> not be /24 and why, which I wasn't really sure about.
> I just assume that's right and /32 is fine because it only needs to get
> masked locally for this single IP. So I'd like to doublecheck; do you
> think this is correct and why (not)?
> Thanks in advance,
> Felix

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