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Server behind HW Loadbalancer

hi,

I have some server behind a hardware loadbalancer(not mine) but why must
i add this lines to /etc/sysctl.conf.
i forgot it one time and so the server was not running right behind the LB.

--
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.conf.all.rp_filter = 1

net.ipv4.conf.default.arp_ignore = 1
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2

vm.dirty_background_ratio = 5
vm.dirty_ratio            = 40
--

is that must if servers are behind a loadbalancer?
or any other way to config it the right way?

thx,
tom