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# sysctl -a | grep forwarding | grep ipv4
net.ipv4.conf.all.bc_forwarding = 0
net.ipv4.conf.all.forwarding = 1
net.ipv4.conf.all.mc_forwarding = 0
net.ipv4.conf.default.bc_forwarding = 0
net.ipv4.conf.default.forwarding = 1
net.ipv4.conf.default.mc_forwarding = 0
net.ipv4.conf.enp1s0.bc_forwarding = 0
net.ipv4.conf.enp1s0.forwarding = 1
net.ipv4.conf.enp1s0.mc_forwarding = 0
net.ipv4.conf.lo.bc_forwarding = 0
net.ipv4.conf.lo.forwarding = 1
net.ipv4.conf.lo.mc_forwarding = 0
net.ipv4.conf.vpns.bc_forwarding = 0
net.ipv4.conf.vpns.forwarding = 1
net.ipv4.conf.vpns.mc_forwarding = 0