[cisco-voip] Does callmanager 5.1 block pings?

[Jason Burns]

iptables has a rate limiting rule on the CallManager for inbound ICMP
traffic on the INPUT chain.

This isn't documented anywhere to the best of my knowledge.

On Tue, Nov 11, 2008 at 12:09 AM, Adam Blomfield <adman at adman.net> wrote:

> 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.
>
> -Adam
>
>
> On Mon, Nov 10, 2008 at 2:25 PM, Nick Griffin <nick.jon.griffin at gmail.com>wrote:
>
>> ICMP Dos prevention, the phones do the same thing.
>>
>> On Mon, Nov 10, 2008 at 9:19 AM, Jason Roysdon <
>> cisco-voip.20081105 at jason.roysdon.net> wrote:
>>
>>> While I've never seen it documented, yes, it is "normal" (but typically
>>> system abnormal) behavior that I've experienced as well.
>>>
>>> Adam Blomfield wrote:
>>> > Sorry to drag up an old thread, but I'm curious about this one. I have
>>> > just ran across this exact same ping symptoms as shown below - four
>>> > successful pings followed by one fail. I can replicate this on four
>>> > separate clusters 100% of the time. In all cases I was pinging the CUCM
>>> > from the default gateway (Catalyst switch). Is this expected behavior?
>>> >
>>> > -Adam
>>> >
>>> > On Fri, Feb 15, 2008 at 11:02 AM, Jonathan Charles <jonvoip at gmail.com
>>> > <mailto:jonvoip at gmail.com>> wrote:
>>> >
>>> >     I am having voice quality issues (dropped packets), and when I ping
>>> >     CCM, I get the following results:
>>> >
>>> >
>>> >     VH-4507#ping 192.168.1.1 <http://192.168.1.1> repeat 50
>>> >
>>> >     Type escape sequence to abort.
>>> >     Sending 50, 100-byte ICMP Echos to 192.168.1.1 <http://192.168.1.1
>>> >,
>>> >     timeout is 2 seconds:
>>> >     !!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!
>>> >     Success rate is 84 percent (42/50), round-trip min/avg/max = 1/1/4
>>> ms
>>> >     VH-4507#
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>>> >
>>> >
>>> >
>>> >
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>>
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