DNS Lookup - Filter "localhost"
drc at virtualized.org
Tue Nov 18 00:46:03 UTC 2014
>> 3. Do you block >512 Bytes DNS requests?
How many > 512 byte DNS requests are people seeing?
Perhaps the requester meant > 512 byte DNS responses?
Blocking > 512 byte responses would be ... unfortunate.
>> 4. Do you block non-UDP DNS requests or rate-limit requests?
I presume (hope) the "yes" applies rate limiting? Blocking non-UDP DNS is a bad idea. As RFC 5966 states: "... it should be noted that failure to support TCP (or the blocking of DNS over TCP at the network layer) may result in resolution failure and/or application-level timeouts."
> block anycast/broadcast source address packets
How do you know if a source address is an anycast address?
> block fragmented packets
Why would you want to block fragmented packets?
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