diff --git a/ttcn3-ggsn-test/osmo-ggsn-kernel-gtp.cfg b/ttcn3-ggsn-test/osmo-ggsn-kernel-gtp.cfg
index 6fbfd0ef..b377bfa8 100644
--- a/ttcn3-ggsn-test/osmo-ggsn-kernel-gtp.cfg
+++ b/ttcn3-ggsn-test/osmo-ggsn-kernel-gtp.cfg
@@ -44,14 +44,21 @@ line vty
 ggsn ggsn0
  gtp state-dir /tmp
  gtp bind-ip 172.18.3.201
+ # OS#6106: Currently it is not possible to configure multiple APNs with
+ # gtpu-mode kernel-gtp in OsmoGGSN, because it cannot share the GTP-U bind
+ # socket between tunnels.
  apn internet
   gtpu-mode kernel-gtp
-  tun-device tun4
-  type-support v4
+  tun-device tun46
+  type-support v4v6
   ip prefix dynamic 176.16.16.0/20
   ip dns 0 172.18.3.201
   ip dns 1 8.8.8.8
   ip ifconfig 176.16.16.0/20
+  ipv6 prefix dynamic 2001:780:44:2100:0:0:0:0/56
+  ipv6 dns 0 fd02:db8:3::201
+  ipv6 dns 1 2001:4860:4860::8844
+  ipv6 ifconfig 2001:780:44:2100:0:0:0:0/56
   no shutdown
 # apn inet6
 # apn inet46