本策略适用于防范UDP流量攻击（比如阿拉丁UDP攻击器）。TCP连接数攻击限制下单机连接数就行了，我就不多说了。

首先要新建一个网桥，将自己内网卡加入到桥接。

/interface bridge settings set use-ip-firewall=yes

/ip firewall filter add action=add-src-to-address-list address-list=att address-list-timeout=10m chain=input connection-rate=10M-4294967295 protocol=udp src-address=192.168.0.0/24

/ip firewall mangle add action=add-src-to-address-list address-list=att address-list-timeout=10m chain=postrouting connection-rate=10M-4294967295 protocol=udp src-address=192.168.0.0/24

修改IP为自己的内网IP地址范围。

:global attip

:global defint

:global taa 0

:global nowmonth

:global allmonth jan,feb,mar,apr,may,jun,jul,aug,sep,oct,nov,dec

:foreach lizi in=[$allmonth] do={

:if ([:pick [/system clock get date] 0 3]=$lizi) do={

:set nowmonth ($taa+1)}

:set taa ($taa + 1)}

:global atttime ([:pick [/system clock get date] 7 11].$nowmonth.[:pick [/system clock get date] 4 6]."-".[/system clock get time]);

:foreach fatt in=[/ip firewall address-list find list=att] do={

:set attip [/ip firewall address-list get $fatt address]

:if ([/interface bridge nat find arp-dst-address=($attip."/32")]="") do={

/interface bridge nat add action=src-nat arp-dst-address=($attip."/32") chain=srcnat mac-protocol=arp comment=("att-".$atttime)}}

:foreach fattd in=[/interface bridge nat find] do={

:if ([/ip firewall address-list find list=att address=[:pick [/interface bridge nat get $fattd arp-dst-address] 0 ([:len [/interface bridge nat get $fattd arp-dst-address]]-3)]]="") do={

/interface bridge nat remove $fattd}}

设置为定时循环执行，建议间隔时间为3-5秒左右为宜。

本策略原理是将攻击者的IP记录下来，加入攻击者的IP到桥防火墙，攻击者的 IP将在ARP缓存超时后（WIN7系统5次测试计算后得到平均值为20秒左右。）无法和ROS通讯，因为找不到ROS的MAC，包括流量攻击也打不上 来，因为找不到目标。（进入桥防火墙后即使攻击者再手工绑定路由MAC也无法成功。）
缺点：若客户机在攻击前已绑定路由MAC，则防御无法生效。因为ARP缓存不会超时。