Dropping IPv6 Fragments

Dobbins, Roland rdobbins at arbor.net
Thu Oct 4 14:36:28 UTC 2012


On Oct 4, 2012, at 9:26 PM, Sander Steffann wrote:

> The closer you get to the edge the more common it might become...

iACLs should be implemented at the network edge to drop all IPv4 and IPv6 traffic - including non-initial fragments - directed towards point-to-point links, loopbacks, and other internal infrastructure with exceptions made for cases where there's a legitimate need for sources outside your network to be able to communicate with your infrastructure.

As mentioned previously on the thread, this has nothing to do with transit data-plane traffic, which should be left untouched unless it's specifically classified as attack traffic or other undesirable traffic.

There's an apparently common misperception that fragmented traffic is somehow bad.  It isn't.  It's normal, under most circumstances.  Protect your infrastructure proactively, deal with anything else on a case-by-case basis.

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Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>

	  Luck is the residue of opportunity and design.

		       -- John Milton




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