iptables has a rate limiting rule on the CallManager for inbound ICMP traffic on the INPUT chain.<br><br>This isn't documented anywhere to the best of my knowledge. <br><br><div class="gmail_quote">On Tue, Nov 11, 2008 at 12:09 AM, Adam Blomfield <span dir="ltr"><<a href="mailto:adman@adman.net">adman@adman.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">That makes sense. Do you know of a document that outlines this. I have a customer that is very concerned about it as they think it indicates a network issue, rather than being by design.<br>
<font color="#888888"><br>-Adam</font><div><div></div><div class="Wj3C7c"><br><br><div class="gmail_quote">
On Mon, Nov 10, 2008 at 2:25 PM, Nick Griffin <span dir="ltr"><<a href="mailto:nick.jon.griffin@gmail.com" target="_blank">nick.jon.griffin@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
ICMP Dos prevention, the phones do the same thing. <br><div><div></div><div><br><div class="gmail_quote">On Mon, Nov 10, 2008 at 9:19 AM, Jason Roysdon <span dir="ltr"><<a href="mailto:cisco-voip.20081105@jason.roysdon.net" target="_blank">cisco-voip.20081105@jason.roysdon.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">While I've never seen it documented, yes, it is "normal" (but typically<br>
system abnormal) behavior that I've experienced as well.<br>
<div><br>
Adam Blomfield wrote:<br>
> Sorry to drag up an old thread, but I'm curious about this one. I have<br>
> just ran across this exact same ping symptoms as shown below - four<br>
> successful pings followed by one fail. I can replicate this on four<br>
> separate clusters 100% of the time. In all cases I was pinging the CUCM<br>
> from the default gateway (Catalyst switch). Is this expected behavior?<br>
><br>
> -Adam<br>
><br>
> On Fri, Feb 15, 2008 at 11:02 AM, Jonathan Charles <<a href="mailto:jonvoip@gmail.com" target="_blank">jonvoip@gmail.com</a><br>
</div><div>> <mailto:<a href="mailto:jonvoip@gmail.com" target="_blank">jonvoip@gmail.com</a>>> wrote:<br>
><br>
> I am having voice quality issues (dropped packets), and when I ping<br>
> CCM, I get the following results:<br>
><br>
><br>
</div>> VH-4507#ping <a href="http://192.168.1.1" target="_blank">192.168.1.1</a> <<a href="http://192.168.1.1" target="_blank">http://192.168.1.1</a>> repeat 50<br>
<div>><br>
> Type escape sequence to abort.<br>
</div>> Sending 50, 100-byte ICMP Echos to <a href="http://192.168.1.1" target="_blank">192.168.1.1</a> <<a href="http://192.168.1.1" target="_blank">http://192.168.1.1</a>>,<br>
<div>> timeout is 2 seconds:<br>
> !!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!<br>
> Success rate is 84 percent (42/50), round-trip min/avg/max = 1/1/4 ms<br>
> VH-4507#<br>
> _______________________________________________<br>
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><br>
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