[tor-relays] We need bridges with iat-mode set to 1 and especially 2 as well!

s7r s7r at sky-ip.org
Tue Jan 25 12:36:21 UTC 2022

juckiuscaesar at web.de wrote:
> Hey,
> I live in Iran. Can't disclose my ISP because one person using Tor was sent to jail recently even though he did nothing wrong.
> For all Bridge Admins:
> You can turn change iat-mode with this config entry in your torrc:
> ServerTransportOptions obfs4 iat-mode=2
> Good Luck.


Wasn't that iat-mode can be used either at one side either at both sides?

E.g. if you use only at your side (client) iat-mode=2 but the bridge 
runs with iat-mode=0, then only your client will inject traffic but it 
might still be enough to bypass the filters of the censor.

Of course if both sides (client and bridge) use iat-mode=2 both sides 
contribute and offering a higher degree of obfuscation, but still, worth 
trying with just client set to iat-mode=2 and bridge set to iat-mode=0 
just so we know here.

So, could you please get an obfs4 bridge from the usual location 
(bridges.torproject.org) that has a iat-mode=0 (like tha majority of 
course) and run it in your client with an overwritten iat-mode=2 
setting, then tell us if it connects to Tor? This will let us know how 
helpful the current iat-mode=0 obfs4 bridges are for Iran.

I am spinning 10 new bridges within 24 hours with obfs4, ipv6, low ports 
and iat-mode=2 natively for Iran anyway, just because you mailed us, but 
still if you could try what I suggested and let us know it would be great.

Thank you, stay safe!
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