我在OSX 10.7.5上，正试图用ipfw将连接添加到我的个人域名，作为指导。 正常延迟：
> ping -c5 troutwine.us PING troutwine.us (198.101.227.131): 56 data bytes 64 bytes from 198.101.227.131: icmp_seq=0 ttl=56 time=92.714 ms 64 bytes from 198.101.227.131: icmp_seq=1 ttl=56 time=91.436 ms 64 bytes from 198.101.227.131: icmp_seq=2 ttl=56 time=91.218 ms 64 bytes from 198.101.227.131: icmp_seq=3 ttl=56 time=91.451 ms 64 bytes from 198.101.227.131: icmp_seq=4 ttl=56 time=91.243 ms --- troutwine.us ping statistics --- 5 packets transmitted, 5 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 91.218/91.612/92.714/0.559 ms 启用ipfw：
> sudo sysctl -w net.inet.ip.fw.enable=0 net.inet.ip.fw.enable: 1 -> 0 > sudo sysctl -w net.inet.ip.fw.enable=1 net.inet.ip.fw.enable: 0 -> 1
pipe道的configuration：
> sudo ipfw add pipe 1 ip from any to 198.101.227.131 00200 pipe 1 ip from any to any dst-ip 198.101.227.131 > sudo ipfw add pipe 2 ip from 198.101.227.131 to any 00500 pipe 2 ip from 198.101.227.131 to any > sudo ipfw pipe 1 config delay 250ms bw 1Mbit/s plr 0.1 > sudo ipfw pipe 2 config delay 250ms bw 1Mbit/s plr 0.1
pipe道就位并configuration：
> sudo ipfw -a list 00100 166 14178 fwd 127.0.0.1,20559 tcp from any to me dst-port 80 in 00200 0 0 pipe 1 ip from any to 198.101.227.131 00300 0 0 pipe 2 ip from 198.101.227.131 to any 65535 37452525 32060610029 allow ip from any to any > sudo ipfw pipe list 00001: 1.000 Mbit/s 250 ms 50 sl.plr 0.100000 0 queues (1 buckets) droptail mask: 0x00 0x00000000/0x0000 -> 0x00000000/0x0000 00002: 1.000 Mbit/s 250 ms 50 sl.plr 0.100000 0 queues (1 buckets) droptail mask: 0x00 0x00000000/0x0000 -> 0x00000000/0x0000
然而，这并没有影响：
> ping -c5 troutwine.us PING troutwine.us (198.101.227.131): 56 data bytes 64 bytes from 198.101.227.131: icmp_seq=0 ttl=56 time=100.920 ms 64 bytes from 198.101.227.131: icmp_seq=1 ttl=56 time=91.648 ms 64 bytes from 198.101.227.131: icmp_seq=2 ttl=56 time=91.777 ms 64 bytes from 198.101.227.131: icmp_seq=3 ttl=56 time=91.466 ms 64 bytes from 198.101.227.131: icmp_seq=4 ttl=56 time=93.209 ms --- troutwine.us ping statistics --- 5 packets transmitted, 5 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 91.466/93.804/100.920/3.612 ms
是什么赋予了？ 我知道ipfw是贬值的，但manpage并没有提到它被禁用。 此外，我不使用networking链接控制器，因为我想影响单个主机。
除了IP之外，你还必须通过pipe道发送ICMP，因为ping使用IP。
尝试这个：
sudo ipfw add pipe 1 icmp from any to 198.101.227.131 sudo ipfw add pipe 2 icmp from 198.101.227.131 to any
我相信有一个更简洁的方式来写这些规则。 今晚晚些时候我会玩，并更新这个。