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linux two interfaces same subnet

February 27th, 2015 Leave a comment Go to comments

On RHEL6 and RHEL7 once you add a second interface on the same subnet, it does not work ( no ping)
The cause of the problem is a change on the parameter rp_filter

vi /etc/sysctl.conf
net.ipv4.conf.default.rp_filter = 2
net.ipv4.conf.all.rp_filter = 2

sysctl -p


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