|
|
Hello,
Recently I've found that my tunnel connection is very slow.
I am using TCP tunnel, and try to connect to my IMAP mail
server.
I think it used to work OK, until recently I don't know what exactly
happened... I don't remember when it stopped working.
I've tried to play with rcvbuf, sndbuf, txqueuelen and tcp-queue-limit...
No change.
Anyone have an idea?
Best Regards,
Alon Bar-Lev.
Client configuration
===========================
openvpn-2.1_beta14
linux-2.6.17
proto tcp-client
remote XX 443
nobind
tls-client
tls-cipher DHE-RSA-AES256-SHA
cipher AES-256-CBC
comp-lzo
connect-retry 10
connect-retry-max 10
tls-timeout 60
hand-window 180
resolv-retry 60
reneg-sec 1200
Server configuration
===========================
openvpn-2.0.7
linux-2.6.16
mode server
local XX
lport 443
proto tcp-server
tls-server
tls-cipher DHE-RSA-AES256-SHA
cipher AES-256-CBC
comp-lzo
server 192.168.222.0 255.255.255.0
tls-timeout 60
keepalive 60 120
hand-window 180
Packets
===========================
When I look at ethereal capture I see the following - notice the Dup ACKs I get.
No. Time Source Destination Protocol Info
1 0.000000 10.0.0.18 192.168.222.6 IMAP Response:
2 0.000009 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=1338 Win=1002 Len=0 TSV=1124023 TSER=13732234
3 0.119827 10.0.0.18 192.168.222.6 IMAP Response:
4 0.119861 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=2676 Win=1002 Len=0 TSV=1124053 TSER=13732235
5 0.163190 10.0.0.18 192.168.222.6 TCP [TCP Dup ACK 3#1] imap > 58411 [ACK] Seq=2676 Ack=0 Win=65535 Len=0
6 0.257795 10.0.0.18 192.168.222.6 TCP [TCP Previous segment lost] imap > 58411 [ACK] Seq=4014 Ack=0 Win=65535 Len=0
7 0.868081 10.0.0.18 192.168.222.6 IMAP [TCP Retransmission] Response: =E4=20
8 0.868104 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=4014 Win=1002 Len=0 TSV=1124240 TSER=13732242
9 0.975400 10.0.0.18 192.168.222.6 IMAP Response: =F8. =
10 0.975433 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=5352 Win=1002 Len=0 TSV=1124267 TSER=13732244
11 1.021447 10.0.0.18 192.168.222.6 TCP [TCP Dup ACK 9#1] imap > 58411 [ACK] Seq=5352 Ack=0 Win=65535 Len=0
12 1.093481 10.0.0.18 192.168.222.6 TCP [TCP Previous segment lost] imap > 58411 [ACK] Seq=6690 Ack=0 Win=65535 Len=0
13 1.748242 10.0.0.18 192.168.222.6 IMAP [TCP Retransmission] Response: A=EC=EE=E9=E3=E9=E5 =
14 1.748265 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=6690 Win=1002 Len=0 TSV=1124460 TSER=13732251
15 1.867993 10.0.0.18 192.168.222.6 IMAP Response: =E2 =E7=E9=E9=E1 =EC=E0=FA=E2=F8 =E0=FA =E0=F0=F9=E9=E5=20
16 1.868030 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=8028 Win=1002 Len=0 TSV=1124490 TSER=13732252
17 1.918764 10.0.0.18 192.168.222.6 TCP [TCP Dup ACK 15#1] imap > 58411 [ACK] Seq=8028 Ack=0 Win=65535 Len=0
18 1.991869 10.0.0.18 192.168.222.6 TCP [TCP Previous segment lost] imap > 58411 [ACK] Seq=9366 Ack=0 Win=65535 Len=0
19 2.400102 10.0.0.18 192.168.222.6 IMAP [TCP Retransmission] Response: 1=EC =
20 2.400126 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=9366 Win=1002 Len=0 TSV=1124623 TSER=13732258
21 2.500556 10.0.0.18 192.168.222.6 IMAP Response: C =F0=E9=FA=EF =EC=E5=EE=F8 =F9=EE=F0=E4=E9=E2=E5=FA=20
22 2.500588 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=10392 Win=1002 Len=0 TSV=1124648 TSER=13732259
23 2.631747 10.0.0.18 192.168.222.6 IMAP Response: {41403}
24 2.631777 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=11730 Win=1002 Len=0 TSV=1124681 TSER=13732259
25 2.668431 10.0.0.18 192.168.222.6 TCP [TCP Dup ACK 23#1] imap > 58411 [ACK] Seq=11730 Ack=0 Win=65535 Len=0
26 2.763961 10.0.0.18 192.168.222.6 TCP [TCP Previous segment lost] imap > 58411 [ACK] Seq=13068 Ack=0 Win=65535 Len=0
27 3.381362 10.0.0.18 192.168.222.6 IMAP [TCP Retransmission] Response: 9=E0 =E0=E1=EF =
28 3.381386 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=13068 Win=1002 Len=0 TSV=1124868 TSER=13732268
29 3.516483 10.0.0.18 192.168.222.6 IMAP Response:
30 3.516516 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=14406 Win=1002 Len=0 TSV=1124902 TSER=13732269
31 3.564793 10.0.0.18 192.168.222.6 TCP [TCP Dup ACK 29#1] imap > 58411 [ACK] Seq=14406 Ack=0 Win=65535 Len=0
32 3.636113 10.0.0.18 192.168.222.6 TCP [TCP Previous segment lost] imap > 58411 [ACK] Seq=15744 Ack=0 Win=65535 Len=0
33 4.155091 10.0.0.18 192.168.222.6 IMAP [TCP Retransmission] Response: EC=E1 =
34 4.155113 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=15744 Win=1002 Len=0 TSV=1125061 TSER=13732275
35 4.296471 10.0.0.18 192.168.222.6 IMAP Response: E5=FA=F8 =
36 4.296504 192.168.222.6 10.0.0.18 TCP 58411 > imap [ACK] Seq=0 Ack=17082 Win=1002 Len=0 TSV=1125097 TSER=13732276
______________________
OpenVPN mailing lists
https://lists.sourceforge.net/lists/listinfo/openvpn-users
|