Talk:Resource attack: Difference between revisions

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imported>Sandy Harris
(questtion about SYN/ACK flags)
imported>Howard C. Berkowitz
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== SYNs and ACKs ==
== SYNs and ACKs ==
The description here of which messages have which flags set is different from what I thought it was. Checking the CERT document linked, their description is different from both. [[User:Sandy Harris|Sandy Harris]] 15:16, 25 June 2010 (UTC)
The description here of which messages have which flags set is different from what I thought it was. Checking the CERT document linked, their description is different from both. [[User:Sandy Harris|Sandy Harris]] 15:16, 25 June 2010 (UTC)
:OK, while the page looks OK to me, let me describe, from wetware memory of lots of protocol analyzer traces. There are nuances for connection collision that probably aren't relevant.
:Originator sends SYN with proposed send sequence number and credit
:Receiver sends SYN-ACK with proposed received sequence number if connection accepted; silent if rejecting connection
:Originator confirms three-way handshake with SYN-ACK and updated bidirectional sequence numbers.
:In a SYN-FLOOD, attacker repeats the first message but never the third.
--[[User:Howard C. Berkowitz|Howard C. Berkowitz]] 15:34, 25 June 2010 (UTC)

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 Definition:  Malware that overwhelms processing, memory, or network resources of a computer system by sending large numbers requests that appear legitimate, but at a high rate or in some manner crafted to make resources unavailable [d] [e]
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SYNs and ACKs

The description here of which messages have which flags set is different from what I thought it was. Checking the CERT document linked, their description is different from both. Sandy Harris 15:16, 25 June 2010 (UTC)

OK, while the page looks OK to me, let me describe, from wetware memory of lots of protocol analyzer traces. There are nuances for connection collision that probably aren't relevant.
Originator sends SYN with proposed send sequence number and credit
Receiver sends SYN-ACK with proposed received sequence number if connection accepted; silent if rejecting connection
Originator confirms three-way handshake with SYN-ACK and updated bidirectional sequence numbers.
In a SYN-FLOOD, attacker repeats the first message but never the third.

--Howard C. Berkowitz 15:34, 25 June 2010 (UTC)

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