On 5/2/2014 1:05 PM, Xin Li wrote:
> Blocking inbound IP fragments is generally a good safety measure, but
> keep in mind that doing so could break certain applications that do
> require it (e.g. don't be surprised if some user behind several layers
> of firewalls see blank pages from your website) and that needs to be
> taken into consideration.
They won't even get to the site in the first place. With EDNS, a very
large DNS response over UDP is possible. On the wire, it's a single
large UDP packet fragmented at the IP level. If you block fragments,
you'll only get the first part of the UDP packet. Using a validating
resolver pretty much guarantees you'll see such UDP packets regularly.
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