FreeBSD 11 不显示 RX、TX 数据包和计数

我有一个 FreeBSD 11 系统，在其中我得到以下ifconfig命令输出

# ifconfig lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384 options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6> inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1 inet 127.0.0.1 netmask 0xff000000 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> groups: lo xn0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=503<RXCSUM,TXCSUM,TSO4,LRO> ether 0e:c2:a2:36:c1:b4 inet 10.0.0.71 netmask 0xffffff00 broadcast 10.0.0.255 nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> media: Ethernet manual status: active

这里有两个疑问：

1. 为什么我没有像以前的 FreeBSD / ubuntu 系统那样获得 RX、TX 字节和数据包计数？我正在使用一个实用程序来解析此响应以获取网络使用情况，但它失败了（无法修改，它是第三方二进制文件）。
2. FreeBSD 11 中的任何更改，因为它在旧版本中运行良好？我更感兴趣的是解决这个问题或进行配置更改（如果这由某个.conf文件控制）而不是更改我的监视方法（例如解析来自iftop或其他命令的响应）

提前致谢 ！

编辑 具体来说，在该二进制文件中使用了一个 C 库来获取结果为零的统计信息。我附上了一个示例代码，它也为 rx/tx 字节返回零值，因为该信息不可用。它使用库getifaddrs中的函数sys/sockets

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <ifaddrs.h>

 struct if_data {
  unsigned char  ifi_type;
  unsigned char  ifi_physical;
  unsigned char  ifi_addrlen;
  unsigned char  ifi_hdrlen;
  unsigned char  ifi_recvquota;
  unsigned char  ifi_xmitquota;
  unsigned long  ifi_mtu;
  unsigned long  ifi_metric;
  unsigned long  ifi_baudrate;

  unsigned long  ifi_ipackets;
  unsigned long  ifi_ierrors;
  unsigned long  ifi_opackets;
  unsigned long  ifi_oerrors;
  unsigned long  ifi_collisions;
  unsigned long  ifi_ibytes;
  unsigned long  ifi_obytes;
  unsigned long  ifi_imcasts;
  unsigned long  ifi_omcasts;
  unsigned long  ifi_iqdrops;
  unsigned long  ifi_noproto;
  unsigned long  ifi_recvtiming;
  unsigned long  ifi_xmittiming;
  struct  timeval ifi_lastchange;
 };


 int main()
 {
  struct ifaddrs    *ifap, *ifa;
  struct if_data    *ifadata = NULL;
  char *dev_name;

  if (getifaddrs(&ifap) < 0) {
    printf ("returning  for null");
    return 1;
  }

  for (ifa = ifap; ifa; ifa = ifa->ifa_next) {

    if (ifa->ifa_flags & 0x01) {
      if ( ifa->ifa_addr->sa_family == AF_LINK) {
        if (ifa->ifa_data) {
          ifadata = (struct if_data *)ifa->ifa_data;
          dev_name = ifa->ifa_name;

          if (ifadata->ifi_ipackets == 0 && ifadata->ifi_opackets == 0)
          {
            printf("returning as zero for %s", dev_name);
            continue;
          }

          printf("name=%s ipkts=%ld opkts=%ld\n", dev_name,
            ifadata->ifi_ipackets, ifadata->ifi_opackets);

          printf("%lu", ifadata->ifi_ibytes);
          printf("%lu", ifadata->ifi_ipackets);
          printf("%lu",  ifadata->ifi_ierrors);
          printf("%lu", ifadata->ifi_iqdrops);
          printf("%lu", ifadata->ifi_imcasts);
          printf("%lu", ifadata->ifi_obytes);
          printf("%lu", ifadata->ifi_opackets);
          printf("%lu",  ifadata->ifi_oerrors);
        }
      }
    }
  }
  freeifaddrs(ifap);
  return 0;
}