<div dir="ltr">We've run into that too, something goofy in 4.x firmware.<div><br></div><div>The sofia profile param tcp-keepalive can be set to like 60000 to send a packet once a minute to keep them open.</div><div>I think I also added the flag to the socket in linux to do this tcp ping pong stuff but it appears that the polycom is doing it some other way and even with a steady flow of these, it gives up and disconnects. So this param above may fix it but I think the polycom is actually not behaving properly and we have to pay for it now with scheduler overhead in the lib.</div>
<div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, May 13, 2013 at 2:37 PM, Spencer Thomason <span dir="ltr"><<a href="mailto:spencer@5ninesolutions.com" target="_blank">spencer@5ninesolutions.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Understood, I though it was quite strange to see these unsolicited
ACKs from the Polycoms followed by a RST.<br>
<br>
Thanks,<br>
Spencer<div><div class="h5"><br>
<br>
<br>
On 05/13/2013 02:07 PM, Steven Schoch wrote:
</div></div><blockquote type="cite"><div><div class="h5">
<div dir="ltr">On Sun, May 12, 2013 at 2:54 PM, Spencer Thomason <span dir="ltr"><<a href="mailto:spencer@5ninesolutions.com" target="_blank">spencer@5ninesolutions.com</a>></span>
wrote:<br>
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The
phones periodically send a TCP ACK ping to<br>
Freeswitch which goes unanswered and then phone then tears
down the TCP<br>
connection. I'm not at all a TCP expert but should
Freeswitch be<br>
responding to this unsolicited ACK?</blockquote>
<div><br>
</div>
<div>I've been working with TCP for 25 years, and
this is the first I have heard of ACK ping. A quick Google
search told me that this technique involves sending a
normal TCP ACK packet (which all TCP packets except the
initial one have, by the way) to a random TCP port. The
host will then respond with a RST packet. (Which means
reset the connection because the ACK was not sent to an
established connection.)</div>
<div><br>
</div>
<div>However, a firewall may filter and discard
these random ACK packets. Since they're not part of
"normal" TCP, no one cares.</div>
<div><br>
</div>
<div>In answer to your question, this is in the TCP
layer much deeper than Freeswitch. There is nothing
Freeswitch can do at this level.</div>
<div><br>
</div>
<div>-- </div>
<div>Steve</div>
</div>
</div>
</div>
<br>
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