Public bug reported:
Binary package hint: linux-image-server
I have an IPVS load balancer configured for direct routing which works fine.
In order for WebServers to handle requests, they need to have the virtual IP
(frontal) configured as a secondary interface of lo.
This is set with 'ifconfig lo:0 $VIP netmask 255.255.255.255 up'.
To avoid ARP problem, IPVS documentation says I should block ARP announces with
the following commands lines in /etc/sysctl.conf :
net.ipv4.conf.all.arp_ignore=1
net.ipv4.conf.eth0.arp_ignore=1
net.ipv4.conf.all.arp_announce=2
net.ipv4.conf.eth0.arp_announce=2
After a reboot, I checked that above values were correctly set in /proc/ and
they were.
As soon as I bring up secondary address on lo, the load balancer receives a lot
(one per request) of SYN_RECV from the switch, meaning the webservers are
announcing themselves despites the above configuration.
Load balancer and webservers are Ubuntu 8.04.1 Server.
** Affects: linux-meta (Ubuntu)
Importance: Undecided
Status: New
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Unable to block ARP broadcasts of secondary addresses in order to use IPVS
https://bugs.launchpad.net/bugs/278982
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