Making Multi-Language Mail Work (Part 1)
Mail software consists of a large number of cooperating pieces, described in RFC 5598. A user composes a message with a Mail User Agent (MUA), which passes it to a Mail Submission Agent (MSA), which in turn usually passes it to a sequence of Mail Transfer Agents (MTAs), which eventually hand it to a Mail Delivery Agent (MDA) to place it in the user’s mail store. If the recipient user doesn’t read
On the Time Value of Security Features in DNS
There are some real problems in DNS, related to the general absence of Source Address Validation (SAV) on many networks connected to the Internet. The core of the Internet is aware of destinations but blind to sources. If an attacker on ISP A wants to forge the source IP address of someone at University B when transmitting a packet toward Company C, that packet is likely be delivered complete and
A Question of DNS Protocols
One of the most prominent denial of service attacks in recent months was one that occurred in March 2013 between Cloudflare and Spamhaus. One writeup of this attack can be found here. I’m not sure about the claim that this attack “almost broke the Internet,” but with a peak volume of attack traffic of some 120Gbps, it was a very significant attack nevertheless. How did the attackers generate such
Technical Comments on Mandated DNS Filtering Requirements of H. R. 3261 (“SOPA”)
About two months ago, I got together with some fellow DNS engineers and sent a letter to the U. S. Senate explaining once again why the mandated DNS filtering requirements of S. 968 (“PIPA”) were technically unworkable. This letter was an updated reminder of the issues we had previously covered in our earlier white paper on the same subject. In the time since then, the U. S. House of Representativ
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On the Time Value of Security Features in DNS
Making Multi-Language Mail Work (Part 3)
Making Multi-Language Mail Work (Part 2)
DNS Firewalls In Action - RPZ vs. Spam
https://circleid.com/posts/isps_angry_at_new_uk_file_sharing_policy/
Not a Guessing Game
Maybe the IETF Won’t Publish SPF and Sender-ID as Experimental RFCs After All