How can i change a parameter for all interfaces in systemd ? For example:sysctl -w net.ipv4.conf.eth0.rp_filter=0sysctl -w net.ipv4.conf.eth1.rp_filter=0How can change it for all interfaces ? 
Change sysctl parameters for all interfaces
systemd;sysctl
Try all and default:# sysctl -w net.ipv4.conf.all.rp_filter=0# sysctl -w net.ipv4.conf.default.rp_filter=0This is explained in the Kernel documentation:conf/default/*:    Change the interface-specific default settings.conf/all/*:        Change all the interface-specific settings.However note that putting a new value in all doesn't change the value you read fromthe interface, but it only gets computed and used internally. See this email for more details.