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-rw-r--r--src/app/config/resolve_addr.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/app/config/resolve_addr.c b/src/app/config/resolve_addr.c
index 15a94cb82e..c8b44de845 100644
--- a/src/app/config/resolve_addr.c
+++ b/src/app/config/resolve_addr.c
@@ -603,8 +603,10 @@ is_local_to_resolve_addr, (const tor_addr_t *addr))
return tor_addr_compare_masked(addr, last_resolved_addr, 24,
CMP_SEMANTIC) == 0;
case AF_INET6:
- /* Look at the /32 like addrs_in_same_network_family() does. */
- return tor_addr_compare_masked(addr, last_resolved_addr, 32,
+ /* Look at /48 because it is typically the smallest network in the global
+ * IPv6 routing tables, and it was previously the recommended per-customer
+ * network block. (See [RFC 6177: IPv6 End Site Address Assignment].) */
+ return tor_addr_compare_masked(addr, last_resolved_addr, 48,
CMP_SEMANTIC) == 0;
break;
default: