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Old 11-21-2019, 07:43 AM   #1
mik256
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Linux router ARP storming ISP


The problem: my linux router (Debian based) losts connection to the gateway and it starts sending ARP like for "who has 8.8.8.8?" in such frequency, that the gateway gets shut down due to packet inspection my ISP has configured on their port. Of course I am on different subnet than Google, so why it makes such attempts if the route is not accessible instead of just waiting? How to prevent this or at least limit? I can't use stuff like arptables or ebtables and tc seems a bit too difficult. Thanks!
 
Old 11-22-2019, 07:22 PM   #2
frankbell
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What is your DNS server setting?
 
Old 11-23-2019, 02:07 AM   #3
mik256
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8.8.8.8;64.6.64.6
No surprise it queries google dns, but why it makes such absurd attempts when gateway route fails and tries it like it was in the same subnet?
 
Old 11-23-2019, 02:40 AM   #4
ferrari
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What model is the router? Ubiquiti?
 
Old 11-23-2019, 12:49 PM   #5
mik256
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@ferrari: it's Kerio Control (stripped Debian)
 
Old 11-23-2019, 02:53 PM   #6
ferrari
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Have you checked (eg sequentially disconnected) hosts on the network to find the offending host. Unlikely to be the router itself IMO.

FWIW, a similar thread...
https://serverfault.com/questions/40...rom-the-router
 
Old 11-25-2019, 03:40 AM   #7
mik256
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I excluded this could be a host on the network. However it is unlikely, it is true that the router appliance is doing this by itself. Someone knows how to configure tc (traffic control) to elimiate arping other (internet) subnets?
 
Old 11-25-2019, 12:20 PM   #8
ferrari
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Perhaps setting arp_announce is suitable here...
https://support.cumulusnetworks.com/...-Cumulus-Linux
https://git.kernel.org/pub/scm/linux...?h=v4.19#n1171
 
  


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