服务器评测
使用route命令。像ifconfig, route, ip等这些工具参数非常多，有问题时应该看看这些工具的参数。窗口大小的变动对FTP等程序性能影响很明显。
[root@ww.linuxidc.com ipv4]# route del -net 10.60.56.0/24
[root@ww.linuxidc.com ipv4]# route add -net 10.60.56.0/24 window 4096 dev eth0
[root@ww.linuxidc.com ipv4]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.60.56.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 10.60.56.254 0.0.0.0 UG 0 0 0 eth0
[root@ww.linuxidc.com ipv4]# netstat -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.60.56.0 * 255.255.255.0 U 0 4096 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
default 10.60.56.254 0.0.0.0 UG 0 0 0 eth0
[root@ww.linuxidc.com ipv4]# route del default gw 10.60.56.254
[root@ww.linuxidc.com ipv4]# route add default gw 10.60.56.254 window 4096 dev eth0
[root@ww.linuxidc.com ipv4]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.60.56.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 10.60.56.254 0.0.0.0 UG 0 0 0 eth0
[root@ww.linuxidc.com ipv4]# netstat -r
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.60.56.0 * 255.255.255.0 U 0 4096 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
default 10.60.56.254 0.0.0.0 UG 0 4096 0 eth0
还需要关掉scalable，即：
[root@ww.linuxidc.com ipv4]# echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
如果希望这个更改在重启后也生效，可以将下面这一行添加到/etc/sysctl.conf文件中：
net.ipv4.tcp_window_scaling=0
