On 15/07/14 17:29, [email protected] wrote:

What is quite odd is:

This happens everyday at 3AM local time
It happens with 5 IP addresses
The 5 ips all belong to Dell.

I wonder if this is being triggered as a result of an ICMP error, in response to a DNS query. Maybe the DNS query happens at 3am (automated job?) which explains the timing.

Maybe try running a tcpdump ring-buffer capture and look at the traffic for that time period.
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