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Roberto
On Monday, February 17, 2003, at 08:37 AM, Roberto Nibali wrote:
Hi,
I'm using LVS/DR for my Mail system. With Redhat 7.3 machines acting
as Director's for a cluster of FreeBSD SMTP servers using Keepalived
for HA and service monitoring.
Ok.
Recently updated one of the SMTP server to from 4.7-stable to
5.0-current and found that LVS/DR works with FreeBSD 5.0-current as
long as ip forwarding is enabled.
I do not believe that it has changed. So something else has changed if
it worked before or you had ip_forwarding=1 before too.
Please convince yourself that the /etc/rc.network in FreeBSD
4.7-stable is the same as with the current CVS:
http://makeashorterlink.com/?A4A823F73
It wasn't working before I turned on ip forwarding. I am absolutely
positive on this point. My FreeBSD 4 machine doin't hav e ip forwarding
turned on and they're doing 500K emails/day, so I'm pretty sure it's
working fine.
I'm also doing LVS/DR which doesn't seem to be the most popular way of
using LVS. The VIP's go in the loopback interface. I am told on the
freebsd-current mailing list that they fixed a long standing bug where
an ip packet coming in on an interface would get passed to all the
other interfaces.
This can be done 2 ways. in /etc/rc.conf
gateway_enable="YES" # Set to YES if this host will be a
gateway.
by manipulating a kernel state directly via sysctl
sysctl net.inet.ip.forwarding=1
The first yields the latter. So in fact there is only one way. What
would be more interesting is, why you need ip_forward on a backend
server. Check your settings in /etc/defaults/rc.conf or make a diff to
the 4.7 one. There were changes related to sendmail defaults in this
file lately.
True they, are 2 different ways to get to the same end point. I'm
running postfix, but it shouldn't matter anyway.
Best regards,
Roberto Nibali, ratz
--
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