[SR-Users] TCP reset behavior

[R, Rajkumar (Raj)]

Hi Daniel,

Please find attached stats output captured every 2 seconds for the entire duration of test (i.e., Start of registration from client till the connection towards client is reset by kamailio after 17mins approximately). I had used 'kamcmd' instead of 'kamctl' for same command arguments.

Setup:

10.27.117.55 (Client) --- Kamailio (10.1.4.55) ---- Backend server (10.2.8.70)

Summary of events executed/observed during the test:


  *   Once the client is registered successfully to the backend, turned off WiFi connection at the client side (time 13:07.05 UTC 2019).
  *   After OPTIONS msg time out for response from the client, backend closes the TCP connection towards kamailio ( around time 13:10:39),
  *   TCP connection towards client side is reset at 13:24:30 (i.e., 17 minutes since the WiFi is turned off)
  *   In wireshark, see re-transmission of a TCP packet from kamailio for about 15 minutes until connection release.



thanks,
raj

From: Daniel-Constantin Mierla <miconda at gmail.com>
Sent: Friday, June 7, 2019 6:14 PM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>; R, Rajkumar (Raj) <rajkumaradass at avaya.com>
Subject: Re: [SR-Users] TCP reset behavior


Hello,

can you reproduce the case and then get the output of the next commands:

kamctl rpc core.tcp_list

kamctl rpc core.tcp_options

kamctl rpc core.tcp_info

Cheers,
Daniel
On 06.06.19 18:53, R, Rajkumar (Raj) wrote:
Hi All,

In our setup running kamailio (alpine image) in stateless mode and have following TCP config set. After client registers to the backend see two TCP connections created - one towards the client and the other towards the backendserver.  If there's a abrupt network disconnect either at the client side or at the backend side, do not see TCP reset happening from kamailio as per the config. Per below config expected after 120seconds( = [tcp_keepidle] + ( [tcp_keepintvl * tcp_keepcnt] ) instead it keeps resending TCP keepalive packets at varying intervals for varying duration length(like 6mins, 14mins..)  before resetting the TCP connections.  Also want to mention that we are not using TCPOPS module here.

I am trying to achieve consistent duration for TCP reset in kamailio. Could you please point me if I have missed anything here?

Setup:

Client ---- Kamailio (stateless mode) ---- Backend server


TCP Config:

tcp_connection_lifetime = 3600
tcp_accept_aliases = no
tcp_async = yes
tcp_connect_timeout = 10
tcp_crlf_ping = yes
tcp_keepalive = yes
tcp_keepcnt = 3
tcp_keepidle = 30
tcp_keepintvl = 30           # Total 2 mins - 30+(30*3)=120 sec
tcp_linger2 = 30
tcp_rd_buf_size = 65536
tcp_send_timeout = 10

thanks,
raj




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