[Ndn-interest] How to calculate max data bytes per packet?

[ndn ndn]

We should consider data segment,Why NDN protocol to consider it , just like
IP?

Sorry for make this email divided into two parts.

Thank you for Junxiao.

yours,qhsong


2015-08-03 15:44 GMT+08:00 ndn ndn <ndn at sqh.me>:

> Dear Junxiao，
> After seen your email, I test my program again. I found I have something
> wrong in my memory. The problem isn't crash, It just *gives me a
> exception message*. I make a mistake. Sorry for that.
>
> Limit the content payload in half of practical limit can not make
> best efficient in transmission.Why not to set a function  to get the max
> content payload? As a application programmer, We shoul
>
> 2015-08-03 10:34 GMT+08:00 Junxiao Shi <shijunxiao at email.arizona.edu>:
>
>> Hi Qihan
>>
>>
>>
>> face.getMaxNdnPacketSize() gives the practical limit of NDN packet
>> length.
>>
>> For a Data packet, this length not only includes the Content payload, but
>> also includes the Name, MetaInfo, and Signature.
>>
>> There’s no general algorithm to compute the limit of payload size,
>> because Signature is generated after Content is prepared, and theoretically
>> its length can depend on the Content (although all defined signing
>> algorithms don’t do that).
>>
>> In most cases, *it’s safe to limit your Content payload to be half of
>> that practical limit*.
>>
>>
>>
>>
>>
>> On the other hand, I notice a problem in ndn-ccl-api description for
>> getMaxNdnPacketSize:
>>
>> This is a static method to get the practical limit of the size of a
>> network-layer packet. If a packet is larger than this, the library or
>> application MAY drop it.
>>
>> This description permits the library to drop the packet when limit is
>> exceeded instead of crashing, but you are observing a crash.
>>
>> You may file a bug on the Redmine site of the specific library you are
>> using (eg. ndn-cpp).
>>
>>
>>
>> Yours, Junxiao
>>
>>
>>
>>
>> *From: *ndn ndn
>> *Sent: *Sunday, August 2, 2015 06:21
>> *To: *ndn-interest at lists.cs.ucla.edu
>> *Subject: *[Ndn-interest] How to calculate max data bytes per packet?
>>
>>
>>
>>
>>
>> Hello everyone,
>>
>> Recently,I want to send a large packet via NDN.When I using
>> NDN-CCL,face.getMaxNdnPacketSize() can get the max packet size in NDN
>> network.
>>
>> But I use data.setContent() to set face.getMaxNdnPacketSize() bytes
>> data,the program crashed,it tells me the size of data is too large than max
>> NDN packet size.
>>
>>
>>
>> So,How to get the max data size I can send?It make me confuse for a long
>> time.
>>
>>
>>
>>
>>
>>
>>
>
>
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