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| Re: proxy_arp setting on host [message #48616 is a reply to message #48425] |
Thu, 25 October 2012 10:55  |
Solar Designer
Messages: 5
Registered: August 2011
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Junior Member |
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On Wed, Oct 17, 2012 at 03:51:25PM +0300, Dmitrijs Jerihovs wrote:
> Can someone explain when i need to use proxy_arp enabled on OpenVZ host and
> why ?
Looks like no one has replied, so let me try.
In my experience, proxy_arp may need to be enabled when a container is
assigned an IP address not in a network that the host has a static route
for on one of its interfaces. Configuring such static routes appears to
be a better approach.
For example, if your server is initially on 192.168.100.0/24, and thus
it has this network configured on its eth0, you may proceed to use IPs
in this /24 for containers with no issues and no magic needed. However,
if at a later time you need to use e.g. 192.168.101.101 for a container,
you might have issues unless you either enable proxy_arp or add a static
route on the host's eth0 for a network containing 192.168.101.101 (e.g.,
for 192.168.101.64/26 or whatever network address and netmask is right).
I observed this behavior on RHEL5'ish OpenVZ kernels.
Alexander
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