yeah, you can search for IP_BINDANY. It's a socket option.
-a
On 10 July 2014 06:52, Aristedes Maniatis <ari at ish.com.au>
wrote:> With the changes in CARP as part of FreeBSD 10 I have some questions about
the best way to do some things.
>
>
> 1. On a load balancer (haproxy) we might have the machine handling 100 or
5000 IP addresses. It would be simplest to just define a /24 (or more) range on
the external interface (or in CARP) but then I cannot bind to each address.
>
> Linux has something like net.ipv4.ip_nonlocal_bind. There appears to be
nothing similar for FreeBSD. Do I need to define a /32 and alias each address?
>
> a. is there a cleaner way?
> b. will that cause performance issues if I create many hundreds of /32
aliases on the interface?
>
>
>
> 2. If I need to define a large number of aliases in CARP I'll quickly
run out of vhids which I understand to go up to 256. What is the real meaning of
vhid in a CARP definition? Can they be shared by different IP addresses on the
load balancer pair? That is, can they all be labelled "vhid=1" or is
CARP limited to 256 IP addresses, each of which has to be a /32 (see above).
>
> All the examples in the FreeBSD manual use a different vhid for each IP
address but doesn't explain why.
>
> a. If two addresses (aliases) share the same vhid, will that mean they fail
over together always? (That might be a good thing for me).
> b. Will it reduce "are you alive?" network traffic between the
CARP cluster to have one vhid?
> c. Will bad things happen if I share vhids?
>
>
> Thanks
> Ari
>
>
> --
> -------------------------->
> Aristedes Maniatis
> ish
> http://www.ish.com.au
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