Send TCP in both directions:

me@harga ~$ time scp philipptoelke.gnunet:tmp/file tmp/d/
file 100%  100MB   4.8MB/s   00:21
real    0m30.588s
user    0m1.484s
sys 0m0.386s

1 files changed, 3 insertions, 0 deletions

diff --git a/src/vpn/gnunet-daemon-vpn-helper.c b/src/vpn/gnunet-daemon-vpn-helper.c
index 40cf96826..b5f83f9db 100644
--- a/src/vpn/gnunet-daemon-vpn-helper.c
+++ b/src/vpn/gnunet-daemon-vpn-helper.c
@@ -274,6 +274,9 @@ message_token (void *cls,
                 }
               else
                 {
+                  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Dropping packet. nxthdr=%d, type=%d, dpt=%x, flg=%d, ports=%x\n",
+                             pkt6->ip6_hdr.nxthdr, ntohl(me->desc.service_type),
+                             ntohs(pkt6_tcp->tcp_hdr.dpt), pkt6_tcp->tcp_hdr.flg, me->desc.ports);
                   GNUNET_free (cls);
                   cls = NULL;
                 }