commit de49e3fab389d484f286e3ea87bc9e35cae62f4e Author: Iain R. Learmonth irl@fsfe.org Date: Thu Jan 15 14:57:33 2015 +0000

Added reverse traceroute specification --- test-helpers/th-006-reverse-traceroute.md | 52 +++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+)

diff --git a/test-helpers/th-006-reverse-traceroute.md b/test-helpers/th-006-reverse-traceroute.md new file mode 100644 index 0000000..6a6071d --- /dev/null +++ b/test-helpers/th-006-reverse-traceroute.md @@ -0,0 +1,52 @@ +# Specification version number + +2014-12-15-000 + +# Specification name + +Reverse Traceroute Test Helper + +# Helper description + +The reverse traceroute test helper listens for incoming connections either on +a TCP socket or via a web server. When a connection is initiated, it performs +a reverse traceroute to the connection's source IP address and returns the +results of the traceroute via the same connection. + +# Helper preconditions + + * An Internet connection + * An Internet-Reachable TCP Port + * No known middleboxes rewriting packet payloads in unexpected ways between + the helper and the transit ISP + +# Expected impact + +Through cross-referencing results, the ability to determine where on the +network path network interference exists which could indicate whether or not +the interference is localised to an access ISP or being conducted on a national +level. + +# Expected inputs + + * The initiation of a connection. + +# Expected output + + * The results of a traceroute giving the IP address of each hop and, if + available, the ping times to each hop. + +The encoding chosen could be JSON, CSV, or another format. It should be +possible to convert between this format and the format used by tests that +perform a forward traceroute in ooni-probe. + +# Possible conclusions + +Through cross-referencing of results, it should be possible to determine in +which AS the network interference is occuring. + +# Notes + +An implementation of this test helper is currently being worked on by Iain R. +Learmonth <irl@fsfe.org> using Scapy. +