Re: [tor-bugs] #6045 [Censorship analysis]: Ethiopia blocks Tor based on ServerHello

["Tor Bug Tracker & Wiki" <torproject-admin@xxxxxxxxxxxxxx>]

#6045: Ethiopia blocks Tor based on ServerHello
---------------------------------+------------------------------------------
 Reporter:  asn                  |          Owner:          
     Type:  task                 |         Status:  assigned
 Priority:  normal               |      Milestone:          
Component:  Censorship analysis  |        Version:          
 Keywords:  dpi                  |         Parent:          
   Points:                       |   Actualpoints:          
---------------------------------+------------------------------------------

Comment(by asn):

 For the record, phunnier_packet and phunniest_packet might be lies. It
 seems that .et treats packets of size 73 or 75 bytes weirdly (possibly
 other sizes too). For example:
 {{{
 # hping3 -p 31923 -E /dev/zero -d 72 -A 213.55.83.157
 # hping3 -p 31923 -E /dev/zero -d 74 -A 213.55.83.157
 # hping3 -p 31923 -E /dev/zero -d 76 -A 213.55.83.157
 }}}
 give RSTs back

 but
 {{{
 # hping3 -p 31923 -E /dev/zero -d 73 -A 213.55.83.157
 # hping3 -p 443 -E  /dev/zero  -d 75 -A 213.55.85.2
 }}}
 do not give RSTs back.

 I'll make a script to see what packet sizes with /dev/zero get dropped.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6045#comment:17>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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