Hi, I've a cisco 1602 running IOS 11.3. The router reboots several times a day by itself. When I look at the log, it shows lot of packets with both source and destination addresses which do not belong to me at the serial interface. Most of them are icmp requests. My router does not drop them instead forward them to its gateway which is my ISP router. My ISP says a lot of traffic generated from my router. So, I tried to drop those unwanted packets by using ACL. But strangely, the moment I tie the ACL on the outside interface, my internal users totally could not browse, nslookup or anything. Could anyone help me? Thanks in advance.
Hi..thanks for the reply. Actually Im applying the access list at the outside interface. But Im wondering how could it affect my internal users' traffic going out through internal interface. Any suggestion?
What is the exact ACL that you are using? Sounds like the routers interface is saturated with probably Nachi ICMP traffic causing memory to exaust, thus rebooting. When you apply the ACL, this as well causes the router to further exaust resources and reboots. To rule out an IOS problem, try upgrading to a newer IOS that fits the mem/flash requirements for your router.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...