使用route命令。像ifconfig, route, ip等這些工具參數非常多，有問題時應該看看這些工具的參數。窗口大小的變動對FTP等程序性能影響很明顯。
[[email protected] ipv4]# route del -net 10.60.56.0/24
[[email protected] ipv4]# route add -net 10.60.56.0/24 window 4096 dev eth0
[[email protected] 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
[[email protected] 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
[[email protected] ipv4]# route del default gw 10.60.56.254
[[email protected] ipv4]# route add default gw 10.60.56.254 window 4096 dev eth0
[[email protected] 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
[[email protected] 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
還需要關掉scalable，即：
[[email protected] ipv4]# echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
如果希望這個更改在重啟後也生效，可以將下面這一行添加到/etc/sysctl.conf文件中：
net.ipv4.tcp_window_scaling=0
