[ntp:questions] Max number of lines that ntpdc -c monlist could display

Danny Mayer mayer at ntp.isc.org
Sun May 6 19:41:32 UTC 2007


Martin Burnicki wrote:
> Danny Mayer wrote:
>> Ronan Flood wrote:
>>> mayer at ntp.isc.org (Danny Mayer) wrote:
>>>
>>>> Eugen COCA wrote:
>>>>> What is the maximum number of lines that
>>>>>
>>>>> ntpdc -c monlist
>>>>>
>>>>> command could display ?
>>>> #define     MAXMONMEM       600     /* we allocate up to 600 structures */
>>> I have that set to 1920 in ntp-4.2.2, which I calculate is the maximum
>>> number of IPv4 addresses that can be returned to ntpdc without changing
>>> the protocol (max 128 UDP packets).  Note that I need to use an earlier
>>> version of ntpdc, which is not IPv6 aware, to get the full list.  I also
>>> had to increase ntpdc's receive socket buffer size to cope
>>> (rbufsize = INITDATASIZE * 9), but that might be an OS issue.
>>>
>> Can you file a bug report on this?
> 
> Shouldn't this be handled with bug #286:
> "ntpdc -nc monlist output failure when amount of clients is over 512"
> https://ntp.isc.org/bugs/show_bug.cgi?id=286
> 
> Martin

Yes, almost identical. So Ronan please add your comments to that bug
report. I think that the biggest problem is timeouts on the client side
probably due to the size of the packet with possible additional
limitations by firewalls not expecting such large packets.

Danny



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