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From "Velusamy, Gandhimathi" <gvelu...@Central.UH.EDU>
Subject Re: how to make ATS to receive traffic on specific ports or certain traffic
Date Sun, 03 Dec 2017 19:25:12 GMT
Hi Alan,

Thanks for your response.

Yes. I used port no while sending http request.

>From a client that connects to the host on eth0 in which ATS is running

gvelusam@p206:~$ wget http://elb1:55554/
--2017-12-03 12:31:41--  http://elb1:55554/
Resolving elb1 (elb1)... 128.163.233.35
Connecting to elb1 (elb1)|128.163.233.35|:55554... connected.
HTTP request sent, awaiting response... 502 Success
2017-12-03 12:31:42 ERROR 502: Success.

netstat at p206, on which ATS is running

gvelus01@elb1:~$ sudo netstat -tupln
tcp        0      0 128.163.233.35:55554    0.0.0.0:*               LISTEN      16160/traffic_serve
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN      1113/rpcbind
tcp        0      0 10.10.3.1:80            0.0.0.0:*               LISTEN      16160/traffic_serve
tcp        0      0 127.0.0.1:8084          0.0.0.0:*               LISTEN      16160/traffic_serve

Used tcpdump to check whether the request has reached elb1:

tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
13:32:14.029399 IP (tos 0x0, ttl 45, id 6805, offset 0, flags [DF], proto TCP (6), length
60)
    uh-fn-nat-105-50.it.uh.edu<http://uh-fn-nat-105-50.it.uh.edu>.42466 > pcvm3-11.pks2.sdn.uky.edu<http://pcvm3-11.pks2.sdn.uky.edu>.55554:
Flags [S], cksum 0xe2a7 (correct), seq 896875447, win 29200, options [mss 1392,sackOK,TS val
434476436 ecr 0,nop,wscale 7], length 0
13:32:14.029492 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 60)
    pcvm3-11.pks2.sdn.uky.edu<http://pcvm3-11.pks2.sdn.uky.edu>.55554 > uh-fn-nat-105-50.it.uh.edu<http://uh-fn-nat-105-50.it.uh.edu>.42466:
Flags [S.], cksum 0x542f (incorrect -> 0x6210), seq 2339713884, ack 896875448, win 28960,
options [mss 1460,sackOK,TS val 794071820 ecr 434476436,nop,wscale 7], length 0
13:32:14.066284 IP (tos 0x0, ttl 45, id 6806, offset 0, flags [DF], proto TCP (6), length
52)


Tried to run ATS in debug mode as below and noticed that server connection not open error:

[Dec  3 13:53:36.962] Server {0x7f18b7a0b700} DEBUG: <HttpTransact.cc<http://httptransact.cc>:3293
(HandleResponse)> (http_seq) [0] [HttpTransact::HandleResponse] Response not valid
[Dec  3 13:53:36.962] Server {0x7f18b7a0b700} DEBUG: <HttpTransact.cc<http://httptransact.cc>:3641
(handle_response_from_server)> (http_trans) [0] [handle_response_from_server] (hrfs)
[Dec  3 13:53:36.962] Server {0x7f18b7a0b700} DEBUG: <HttpTransact.cc<http://httptransact.cc>:3803
(retry_server_connection_not_open)> (http_trans) [0] [1] failed to connect [5] to 10.10.2.1
[Dec  3 13:53:36.962] Server {0x7f18b7a0b700} DEBUG: <HttpTransact.cc<http://httptransact.cc>:3824
(retry_server_connection_not_open)> (http_trans) [0] [retry_server_connection_not_open]
attempts now: 2, max: 3

And I noticed that:

Dec  3 13:53:36.966] Server {0x7f18b7a0b700} DEBUG: <HttpSM.cc<http://httpsm.cc>:4713
(do_http_server_open)> (http) [0] open connection to elb1: 10.10.2.1:55554


But when I tried to send http request from the local client c1, its opening connection to
origin server:

Dec  3 14:02:58.858] Server {0x7f18b7a0b700} DEBUG: <HttpSM.cc<http://httpsm.cc>:4713
(do_http_server_open)> (http) [1] open connection to s2: 10.10.2.2:80

gvelus01@c1:~$ wget http://elb1/
--2017-12-03 14:02:26--  http://elb1/
Resolving elb1 (elb1)... 10.10.3.1
Connecting to elb1 (elb1)|10.10.3.1|:80... connected.
HTTP request sent, awaiting response... 200 OK


I'm unclear on what network topology you are trying to construct. Do you mean you have requests
that originate from eth0 and go to eth2? What addresses are associated with each interface?

I am trying to connect from two clients one using public ip at eth0 other from LAN using eth2.

Please, find attached the topology diagram.



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