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  • #9268

Closed
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Opened Apr 21, 2015 by emmapeel@emmapeelDeveloper

obfs4 bridges often don't work (maybe MTU?)

Originally created by @emmapeel on #9268 (Redmine)

There have been some reports of obfs4 bridges not working.

A user has found out on the router being used some error messages like:

ICMP 185.xx.xx.xx unreachable - need to frag (mtu 1456), length 556

This is not happenning with other bridges or pluggable transports.

I did some searches online and found out some information regarding MTU and encapsulating that I cannot really follow, like

http://opsmonkey.blogspot.com/2007/02/path-mtu-discovery-and-mtu.html

And in https://ubuntuforums.org/archive/index.php/t-979821.html I found a workaround but the user reports no change after applying it (ifconfig wlan0 mtu 1462)

Do we need to do something about this problem? I think obfs4 bridges need to use bigger packages. Maybe it is a documentation issue, or maybe the configuration should be changed when using obsf4 bridges.

Feature Branch: bugfix/9268-deal-with-smaller-MTU

Related issues

  • Related to #12197 (closed)
  • Related to #15168 (closed)
  • Is duplicate of #15548
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Reference: tails/tails#9268