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From Miles Libbey <mlib...@apache.org>
Subject Re: how to make ATS to receive traffic on specific ports or certain traffic
Date Sun, 03 Dec 2017 20:28:43 GMT
Perhaps I'm misreading, but, that looks to me like ATS is answering
your request, but can't reach the origin server. It looks like ATS is
trying to get to your origin on 10.10.2.1:55554, whereas you tested
10.10.2.2:80? Perhaps looking at your remap rule would be helpful.

On Sun, Dec 3, 2017 at 11:25 AM, Velusamy, Gandhimathi
<gvelusam@central.uh.edu> wrote:
> 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.42466 > 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.55554 > 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:3293
> (HandleResponse)> (http_seq) [0] [HttpTransact::HandleResponse] Response not
> valid
> [Dec  3 13:53:36.962] Server {0x7f18b7a0b700} DEBUG: <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: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: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: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: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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