Re: [tor-dev] path selection constraints: /16 subnet rule when using bridges

On 20 Dec 2017, at 03:10, nusenu nusenu-lists@riseup.net wrote:

does the following also apply if a Tor users chooses to use a bridge?

...

- We do not choose more than one router in a given /16 subnet

[1]

Will tor ensure that the relays are not in the same /16 netblock with the bridge?

Yes, as each node is added to the path, its IPv4 address is checked against the IPv4 /16 netblocks of the existing nodes in the path. This includes relays and bridges.

There is no support for checking IPv6 addresses yet: https://trac.torproject.org/projects/tor/ticket/24393 But when there is, we will check IPv6 /32s, for those nodes that have IPv6 addresses.

… [1] https://gitweb.torproject.org/torspec.git/tree/path-spec.txt#n239