code: func applyNetworkingInfo(info *SysInfo, _ map[string]string) []string {
  	var warnings []string
  	info.IPv4ForwardingDisabled = !readProcBool("/proc/sys/net/ipv4/ip_forward")
  	info.BridgeNFCallIPTablesDisabled = !readProcBool("/proc/sys/net/bridge/bridge-nf-call-iptables")
  	info.BridgeNFCallIP6TablesDisabled = !readProcBool("/proc/sys/net/bridge/bridge-nf-call-ip6tables")
  	return warnings
  }
docs: // applyNetworkingInfo adds networking information to the info.