Encourage sbws operators to install a local caching resolver

Installing a local caching resolver avoids issues with the provider's DNS.

changed milestone to %sbws: 1.0.x-final

added component::core tor/sbws doc milestone::sbws: 1.0.x-final parent::28458 priority::medium resolution::wontfix sbws-1.0-must-closed-moved-20181128 severity::normal status::closed type::defect version::sbws 1.0.0 labels

I don't think this is a good idea, because:

1. you give more work to bwauths
2. sbws relay on one more external thing
3. sbws traffic is fingerprintable, but dns queries will go in most cases in clear
4. if using a CDN, the ip that that the bwauth server gets will be different that the one the exit will see, so checking if we can exit with a relay with that ip, doesn't make sense

5. it's also not needed, if the exit doesn't allow to reach the http server ip, it'll just fail, and sbws will try with other exit

Replying to juga:

I don't think this is a good idea, because:

1. you give more work to bwauths

Yes, this is true. Although installing a caching / recursive resolver takes about 5 minutes.

2. sbws relay on one more external thing

sbws already relies on the system DNS resolver, which is sometimes unreliable. Installing a caching or recursive resolver makes DNS more reliable.

3. sbws traffic is fingerprintable, but dns queries will go in most cases in clear

sbws already relies on the system DNS resolver, which sends DNS queries in the clear.

4. if using a CDN, the ip that that the bwauth server gets will be different that the one the exit will see, so checking if we can exit with a relay with that ip, doesn't make sense

We already talked about the CDN issue in: https://trac.torproject.org/projects/tor/ticket/28458#comment:3

If we decide to stop using DNS in #28458 (moved), then we can close this ticket.

I don't think we will do this ticket.

Trac:
Milestone: N/A to sbws 1.0 (MVP must)
Status: new to closed
Resolution: N/A to wontfix

Move all closed sbws 1.0 must tickets to sbws 1.0.x-final

Trac:
Keywords: N/A deleted, sbws-1.0-must-closed-moved-20181128 added
Milestone: sbws 1.0 (MVP must) to sbws: 1.0.x-final

closed

moved to tpo/network-health/sbws#28461 (closed)