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I work for an isp and we have a router that is getting killed by the nachi virus. i have blocked all the ports they say to except netbios cause we use it and icmp. the router that is getting hit is one in the middle and not an area router. here is the running config, anything else needed would be great. i know i need to black icmp but i am not sure where, as in in or out and on which router, the one that is getting hit or the two its connected too. any helps would be great, then i could leave and enjoy labor day.
Don't really know what your network topology is so can't really recommend where you should put your ACL. This depends on the source of ICMP. If it comes from the other two routers then it's best to block ICMP from the other routers. If it comes from the affected router then you should simply block it right there and then. With the ACL, can't really recommend anything but I know that my ISP simply notify their customers that they'll block ALL ICMP packets on the Internet. It's drastic but something that they have to do.
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