pr57.fbikey.com
报的错误很奇怪：
[root@proxy057 ~]# curl http://pr57.fbikey.com/phpproxy/
curl: (7) Failed to connect to 213.5.65.19: No buffer space available
经查是ARP表满了，需要调大内核参数中的ARP表
echo 1280 >/proc/sys/net/ipv4/neigh/default/gc_thresh1
echo 5120 >/proc/sys/net/ipv4/neigh/default/gc_thresh2
echo 10240 >/proc/sys/net/ipv4/neigh/default/gc_thresh3