Why do I get packets 'input' on Null0

Unanswered Question
Sep 23rd, 2010
User Badges:

Hello,


I have noticed that I am getting a large amount of packets input on my 3825 VPN router when I do a 'show int null0'.


I understand the normal reasons for packets going out of null0 (summarization, desired black holing etc) but why would null0 be a source of packets? The number of packets is only slightly less than the packets going through the router - and I have many succesfull site-to-site VPNs. 


I suspect this is some kind of feature, but didn't want to just ignore it.


Thanks,

Andy.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
Diego Armando C... Mon, 09/27/2010 - 15:23
User Badges:
  • Bronze, 100 points or more

I think these are L2 packets related with ARP


Do you have RTBH configured anywhere?


Input means that the packets are received. When something is received in that interface I think that the interface send an icmp unreachable message so those are the output messages.

Actions

This Discussion