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plurals

PO
primarykey
Id
13778371
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2012-12-08T14:26:20.130
FavoriteCount
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LastActivityDate
2012-12-08T14:36:05.840
LastEditDate
2012-12-08T14:36:05.840
LastEditorUserId
169895
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169895
ParentId
13778172
PostTypeId
2
Score
1
ViewCount
0
LastEditorDisplayName
text
Body
As you may now 16 bit UDP length field indicates that you can send a total of 65535 bytes. However, the data can be theoretically (sizeof(IP Header) + sizeof(UDP Header)) = 65535-(20+8) = 65507 bytes. But this does not mean that all applications that are using UDP will send this amount of data as an example DNS packets limits to 512 bytes. This is because you don't get any ACK packets from server. This is one reason that packets may get lost in the network (packet transmission problems and loss). Secondly intermediate nodes may encapsulate datagrams inside of another protocol, as an example IPSEC or other protocols do that. For UDP there is no ACK packets, so in your case if underlying application uses UDP you should not see any ACK packets. Secondly, some of the server limit their sizes to the max UDP packets depending on the application, so if you have data transfer from client to server you should see same bytes e.g 512 bytes. going and coming back in wireshark. Mostly, source makes the request and destination sends X bytes UDP datagrams back. These links may be good for your questions: <ol> <li><a href="http://it.iut.ac.ir/sites/fsites/it/files/u4/uploads/Networking%20Class-Wireshar%20Labs-Solutions/04-Wireshark_UDP_Solution_July_22_2007.pdf" rel="nofollow">Wireshark UDP analysis</a></li> <li><a href="http://tools.ietf.org/html/rfc1122" rel="nofollow">RFC 1122</a> (states that 576 is the minimum maximum reassembly buffer size) </li> </ol>
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1. This table or related slice is empty.
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1. POUDP Networking Fundamentals
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1. PTAnswer
UserLastEditorUserId
1. USberkay
UserOwnerUserId
1. USberkay
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1. VO
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CommentsPostId
1. COI think the OP is talking about sending an application-level ACK via UDP.
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 USChrisW
2. COYeah I'm sending ACKs myself as a packet number (uint 16) and a set of ack flags (the previous 32 acks in a int32 bitmask)
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 USChris Bampton

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