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-rw-r--r--proposals/311-relay-ipv6-reachability.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/proposals/311-relay-ipv6-reachability.txt b/proposals/311-relay-ipv6-reachability.txt
index d2f6b70..ace1704 100644
--- a/proposals/311-relay-ipv6-reachability.txt
+++ b/proposals/311-relay-ipv6-reachability.txt
@@ -213,6 +213,14 @@ Ticket: #24404
way, and lets us migrate from the current behavior to the 3.3.1 behavior
down the road.
+ However, it might not be necessary: clients should not care if their
+ extends are over IPv4 or IPv6, they just want to get to an exit safely.
+ (And clients should not depend on using IPv4 or IPv6, because relays may
+ use an existing authenticated connection to extend.) The only use case
+ where extends might want to prefer IPv4 or IPv6 is relay reachability
+ tests. But we want our reachability test design to succeed, without
+ depending on the specific extend implementation.
+
3.4. Rejected Extend Designs
Some designs may never be suitable for the Tor network.