最后在网上查了下，试了许多方法都没有用，改什么MMS值等都解决不了。问题大概在下面。

把属性值我全部都调大了，以前打开一半的网站，现在基本可以全部打开了。

/ ip firewall connection tracking

set enabled=yes tcp-syn-sent-timeout=5s

tcp-syn-received-timeout=5s tcp-established-timeout=5h

tcp-fin-wait-timeout=10s tcp-close-wait-timeout=10s

tcp-last-ack-timeout=10s \

tcp-time-wait-timeout=10s tcp-close-timeout=10s udp-timeout=10s

udp-stream-timeout=2m icmp-timeout=10s generic-timeout=5m

tcp-syncookie=no

修改脚本

/ ip firewall connection tracking

set enabled=yes tcp-syn-sent-timeout=2m30s

tcp-syn-received-timeout=2m30s tcp-established-timeout=10h

tcp-fin-wait-timeout=5m tcp-close-wait-timeout=5m

tcp-last-ack-timeout=5m \

tcp-time-wait-timeout=5m tcp-close-timeout=5m udp-timeout=5m

udp-stream-timeout=10m icmp-timeout=5m generic-timeout=20m

tcp-syncookie=yes

另类资料

ros网吧打开网页慢ROS里加上这些

/ip fir man

/ip fir man add chain=postrouting protocol=tcp tcp-flags=syn

action=passthrough

/ip fir man add chain=forward protocol=tcp tcp-flags=syn

action=change-mss

new-mss=1440

/ip fir man add chain=postrouting protocol=tcp tcp-flags=syn

action=change-mss

new-mss=1440

/ip fir man add chain=output protocol=tcp tcp-flags=syn

action=change-mss

new-mss=1440

/ip fir man add chain=prerouting action=accept

另外解决ros 网页断流

首先，检查你的ROS，确定他本身没有任何问题。然后，打开你的WINBOX登陆进去，打开防火墙

规则，IP-FIREWALL-CONNECTIONS-TRACKING

好了。打开TRACKING后，将里面的时间设置稍微大

点。具体多大，没有确切数字，不过一定要大。最少也得30秒以上。你按照里面的默认，成倍

数增加，慢慢试。下面是我自己的设置。已经没有问题了，具体什么原因，慢慢去体会。这个

设置不是固定的。因为跟你的网络有关系。

/ ip firewall connection tracking set enabled=yes

tcp-syn-sent-timeout=2m30s

tcp-syn-received-timeout=2m30s

tcp-established-timeout=10h

tcp-fin-wait-timeout=2m30s

tcp-close-wait-timeout=2m30s

tcp-last-ack-timeout=2m30s

tcp-time-wait-timeout=2m30s

tcp-close-timeout=30s

udp-timeout=2m30s

udp-stream-timeout=6m

icmp-timeout=2m30s

generic-timeout=20m

tcp-syncookie=yes