diff --git a/changes/feature21269 b/changes/feature21269
new file mode 100644
index 0000000000..56d5dcc4de
--- /dev/null
+++ b/changes/feature21269
@@ -0,0 +1,3 @@
+  o Minor Feature (client):
+    - Enable IPv6 traffic by default on the SocksPort. To disable this, a user
+      will have to specify "NoIPv6Traffic". Closes #21269.
diff --git a/src/or/config.c b/src/or/config.c
index d0ca561e1f..1ea8712379 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -6246,6 +6246,7 @@ port_cfg_new(size_t namelen)
   tor_assert(namelen <= SIZE_T_CEILING - sizeof(port_cfg_t) - 1);
   port_cfg_t *cfg = tor_malloc_zero(sizeof(port_cfg_t) + namelen + 1);
   cfg->entry_cfg.ipv4_traffic = 1;
+  cfg->entry_cfg.ipv6_traffic = 1;
   cfg->entry_cfg.dns_request = 1;
   cfg->entry_cfg.onion_traffic = 1;
   cfg->entry_cfg.cache_ipv4_answers = 1;
@@ -6599,7 +6600,7 @@ parse_port_config(smartlist_t *out,
     /* This must be kept in sync with port_cfg_new's defaults */
     int no_listen = 0, no_advertise = 0, all_addrs = 0,
       bind_ipv4_only = 0, bind_ipv6_only = 0,
-      ipv4_traffic = 1, ipv6_traffic = 0, prefer_ipv6 = 0, dns_request = 1,
+      ipv4_traffic = 1, ipv6_traffic = 1, prefer_ipv6 = 0, dns_request = 1,
       onion_traffic = 1,
       cache_ipv4 = 1, use_cached_ipv4 = 0,
       cache_ipv6 = 0, use_cached_ipv6 = 0,
diff --git a/src/test/test_config.c b/src/test/test_config.c
index eeda34e089..3b19cad036 100644
--- a/src/test/test_config.c
+++ b/src/test/test_config.c
@@ -4129,6 +4129,7 @@ test_config_parse_port_config__ports__ports_given(void *data)
   config_free_lines(config_port_invalid); config_port_invalid = NULL;
   config_port_invalid = mock_config_line("SOCKSPort",
                                          "unix:/tmp/foo/bar NoIPv4Traffic "
+                                         "NoIPv6Traffic "
                                          "NoOnionTraffic");
   ret = parse_port_config(NULL, config_port_invalid, NULL, "SOCKS",
                           CONN_TYPE_AP_LISTENER, NULL, 0,
@@ -4150,6 +4151,7 @@ test_config_parse_port_config__ports__ports_given(void *data)
   SMARTLIST_FOREACH(slout,port_cfg_t *,pf,port_cfg_free(pf));
   smartlist_clear(slout);
   config_port_valid = mock_config_line("DNSPort", "127.0.0.1:80 "
+                                       "NoIPv6Traffic "
                                        "NoIPv4Traffic NoOnionTraffic");
   ret = parse_port_config(slout, config_port_valid, NULL, "DNS",
                           CONN_TYPE_AP_DNS_LISTENER, NULL, 0,
@@ -4165,6 +4167,7 @@ test_config_parse_port_config__ports__ports_given(void *data)
   // Test failure if we have DNS but no ipv4 and no ipv6
   config_free_lines(config_port_invalid); config_port_invalid = NULL;
   config_port_invalid = mock_config_line("SOCKSPort",
+                                         "NoIPv6Traffic "
                                          "unix:/tmp/foo/bar NoIPv4Traffic");
   ret = parse_port_config(NULL, config_port_invalid, NULL, "SOCKS",
                           CONN_TYPE_AP_LISTENER, NULL, 0,
@@ -4177,6 +4180,7 @@ test_config_parse_port_config__ports__ports_given(void *data)
   SMARTLIST_FOREACH(slout,port_cfg_t *,pf,port_cfg_free(pf));
   smartlist_clear(slout);
   config_port_valid = mock_config_line("SOCKSPort", "unix:/tmp/foo/bar "
+                                       "NoIPv6Traffic "
                                        "NoDNSRequest NoIPv4Traffic");
   ret = parse_port_config(slout, config_port_valid, NULL, "SOCKS",
                           CONN_TYPE_AP_LISTENER, NULL, 0,
@@ -4198,6 +4202,7 @@ test_config_parse_port_config__ports__ports_given(void *data)
   SMARTLIST_FOREACH(slout,port_cfg_t *,pf,port_cfg_free(pf));
   smartlist_clear(slout);
   config_port_valid = mock_config_line("SOCKSPort", "unix:\"/tmp/foo/ bar\" "
+                                       "NoIPv6Traffic "
                                        "NoDNSRequest NoIPv4Traffic");
   ret = parse_port_config(slout, config_port_valid, NULL, "SOCKS",
                           CONN_TYPE_AP_LISTENER, NULL, 0,
@@ -4219,6 +4224,7 @@ test_config_parse_port_config__ports__ports_given(void *data)
   SMARTLIST_FOREACH(slout,port_cfg_t *,pf,port_cfg_free(pf));
   smartlist_clear(slout);
   config_port_valid = mock_config_line("SOCKSPort", "unix:\"/tmp/foo/ bar "
+                                       "NoIPv6Traffic "
                                        "NoDNSRequest NoIPv4Traffic");
   ret = parse_port_config(slout, config_port_valid, NULL, "SOCKS",
                           CONN_TYPE_AP_LISTENER, NULL, 0,
@@ -4230,6 +4236,7 @@ test_config_parse_port_config__ports__ports_given(void *data)
   SMARTLIST_FOREACH(slout,port_cfg_t *,pf,port_cfg_free(pf));
   smartlist_clear(slout);
   config_port_valid = mock_config_line("SOCKSPort", "unix:\"\" "
+                                       "NoIPv6Traffic "
                                        "NoDNSRequest NoIPv4Traffic");
   ret = parse_port_config(slout, config_port_valid, NULL, "SOCKS",
                           CONN_TYPE_AP_LISTENER, NULL, 0,
@@ -4604,7 +4611,7 @@ test_config_parse_port_config__ports__ports_given(void *data)
   tt_int_op(smartlist_len(slout), OP_EQ, 1);
   port_cfg = (port_cfg_t *)smartlist_get(slout, 0);
   tt_int_op(port_cfg->entry_cfg.ipv4_traffic, OP_EQ, 1);
-  tt_int_op(port_cfg->entry_cfg.ipv6_traffic, OP_EQ, 0);
+  tt_int_op(port_cfg->entry_cfg.ipv6_traffic, OP_EQ, 1);
 
   // Test failure for a SessionGroup argument with invalid value
   config_free_lines(config_port_invalid); config_port_invalid = NULL;