Hi, I'm wondering if this could be related to mono or not: I have a
Mono command line program (Mono 2.0) running the following code:
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Timeout = 30000;
string data;
using (WebResponse resp = request.GetResponse())
{
using (Stream stream = resp.GetResponseStream())
{
using (StreamReader sr = new StreamReader(stream))
{
data = sr.ReadToEnd().Trim();
}
}
}
Sporadically, I am getting the following weirdness in a TCPDUMP:
NOTICE: The HTTP GET request actually receives a 200 OK response, but
that apparently is not enough for the Mono client to finish its stream
and return, and then there are all kinds of retransmits and other
things.
This happens only sporadically.
12 2008-10-22 12:18:49.237572 10.20.30.180 10.20.30.178 TCP
54591 >
http [SYN] Seq=0 Win=5840 Len=0 MSS=1460 TSV=208836954 TSER=0 WS=7
15 2008-10-22 12:18:49.237766 10.20.30.178 10.20.30.180 TCP
http >
54591 [SYN, ACK] Seq=0 Ack=1 Win=16384 Len=0 MSS=1460 WS=0 TSV=0
TSER=0
16 2008-10-22 12:18:49.237783 10.20.30.180 10.20.30.178 TCP
54591 >
http [ACK] Seq=1 Ack=1 Win=5888 Len=0 TSV=208836955 TSER=0
17 2008-10-22 12:18:49.245585 10.20.30.180 10.20.30.178 HTTP
GET /execute.aspx
18 2008-10-22 12:18:49.356969 10.20.30.178 10.20.30.180
HTTP/XML HTTP/1.1
200 OK
19 2008-10-22 12:18:49.446099 10.20.30.180 10.20.30.178 HTTP
[TCP
Retransmission] GET /execute.aspx
20 2008-10-22 12:18:49.446182 10.20.30.178 10.20.30.180 TCP
[TCP Dup
ACK 18#1] http > 54591 [ACK] Seq=267 Ack=203 Win=65333 Len=0
TSV=5492664 TSER=208836962
21 2008-10-22 12:18:49.848097 10.20.30.180 10.20.30.178 HTTP
[TCP
Retransmission] GET /execute.aspx
22 2008-10-22 12:18:49.848190 10.20.30.178 10.20.30.180 TCP
[TCP Dup
ACK 18#2] http > 54591 [ACK] Seq=267 Ack=203 Win=65333 Len=0
TSV=5492669 TSER=208836962
27 2008-10-22 12:18:52.293569 10.20.30.178 10.20.30.180
HTTP/XML [TCP
Retransmission] HTTP/1.1 200 OK
34 2008-10-22 12:19:07.340362 10.20.30.178 10.20.30.180 TCP
http >
54591 [RST, ACK] Seq=267 Ack=203 Win=0 Len=0
37 2008-10-22 12:19:14.772185 10.20.30.180 10.20.30.178 HTTP
[TCP
Window Full] [TCP Retransmission] GET /execute.aspx
38 2008-10-22 12:19:14.772281 10.20.30.178 10.20.30.180 TCP
http >
54591 [RST] Seq=1 Win=0 Len=0
41 2008-10-22 12:19:19.235335 10.20.30.180 10.20.30.178 TCP
54591 >
http [FIN, ACK] Seq=203 Ack=1 Win=5888 Len=0 TSV=208866952 TSER=0
42 2008-10-22 12:19:19.235430 10.20.30.178 10.20.30.180 TCP
http >
54591 [RST] Seq=1 Win=0 Len=0
Here is a good case:
5 2008-10-22 12:55:12.039774 10.20.30.180 10.20.30.178 TCP
35019 >
http [SYN] Seq=0 Win=5840 Len=0 MSS=1460 TSV=211019727 TSER=0 WS=7
6 2008-10-22 12:55:12.039848 10.20.30.178 10.20.30.180 TCP
http >
35019 [SYN, ACK] Seq=0 Ack=1 Win=16384 Len=0 MSS=1460 WS=0 TSV=0
TSER=0
7 2008-10-22 12:55:12.039866 10.20.30.180 10.20.30.178 TCP
35019 >
http [ACK] Seq=1 Ack=1 Win=5888 Len=0 TSV=211019728 TSER=0
8 2008-10-22 12:55:12.047698 10.20.30.180 10.20.30.178 HTTP
GET /execute.aspx
9 2008-10-22 12:55:12.157555 10.20.30.178 10.20.30.180
HTTP/XML HTTP/1.1 200 OK
10 2008-10-22 12:55:12.157572 10.20.30.180 10.20.30.178 TCP
35019 >
http [ACK] Seq=197 Ack=267 Win=6912 Len=0 TSV=211019846 TSER=5514492
11 2008-10-22 12:55:12.270820 10.20.30.180 10.20.30.178 TCP
35019 >
http [FIN, ACK] Seq=197 Ack=267 Win=6912 Len=0 TSV=211019959
TSER=5514492
12 2008-10-22 12:55:12.270910 10.20.30.178 10.20.30.180 TCP
http >
35019 [ACK] Seq=267 Ack=198 Win=65339 Len=0 TSV=5514493 TSER=211019959
13 2008-10-22 12:55:12.270926 10.20.30.178 10.20.30.180 TCP
http >
35019 [FIN, ACK] Seq=267 Ack=198 Win=65339 Len=0 TSV=5514493
TSER=211019959
14 2008-10-22 12:55:12.270937 10.20.30.180 10.20.30.178 TCP
35019 >
http [ACK] Seq=198 Ack=268 Win=6912 Len=0 TSV=211019959 TSER=5514493
Could this possibly be a Mono bug or is this an infrastructure problem
with my NIC or switch?
Thanks!
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