This is correct ... Some things may not accept/forward it. Beyond that its common for things to get *added to it* thus you want to be below. Consider a case where its being wrapped (tunneling is a good example).
Over the internet the maximum completely safe size is even smaller around 500-600 bytes :O You can usually get above this but +- 1k is about the limit. On Sun, Jan 12, 2020 at 4:42 PM Stephan Opfer <[email protected]> wrote: > Ah okay. I read some posts about MTU and fragmentation. So in theory > 2^16= 65536 Bytes should be possible, but not all nodes will accept such > large UDP packets and support the fragmentation of it? > > FYI: My use case is that of a local network (IOT + Autonomous Robots) and > increasing the size would help me. :) > On 12.01.20 13:25, Doron Somech wrote: > > We can increase it to around 65,000 bytes, however, large UDP packets > would probably be dropped when traveling outside your local area network. > The safe size for the UDP packet to travel outside of the local area > network is around 500 bytes. > If you do want to use large UDP packets on your local area network you > might want to increase the network MTU (jumbo frames) for better delivery. > > For example, some AWS instances support 9001 bytes MTU for inter-instance > communication. > > > On Fri, Jan 10, 2020 at 3:25 PM Stephan Opfer <[email protected]> > wrote: > >> Hi all, >> >> since 2016 there is this issue >> (https://github.com/zeromq/libzmq/issues/2009) about some limitations of >> the udp_engine in libzmq. >> >> Is it possible that someone at least will increase the "#define >> MAX_UDP_MSG 8192" in libzmq/src/udp_engine.hpp to some reasonable value? >> For example "ZMQ_MAX_MSGSZ" from the zmq context option, which is MAX_INT. >> >> Maybe, someone could spare some time at the Hackathon... ;-) >> >> Greetings, >> >> Stephan >> >> -- >> Distributed Systems Research Group >> Stephan Opfer T. +49 561 804-6279 F. +49 561 804-6277 >> Univ. Kassel, FB 16, Wilhelmshöher Allee 73, D-34121 Kassel >> WWW: http://www.uni-kassel.de/go/vs_stephan-opfer/ >> >> _______________________________________________ >> zeromq-dev mailing list >> [email protected] >> https://lists.zeromq.org/mailman/listinfo/zeromq-dev >> > > _______________________________________________ > zeromq-dev mailing > [email protected]https://lists.zeromq.org/mailman/listinfo/zeromq-dev > > -- > Distributed Systems Research Group > Stephan Opfer T. +49 561 804-6279 F. +49 561 804-6277 > Univ. Kassel, FB 16, Wilhelmshöher Allee 73, D-34121 Kassel > WWW: http://www.uni-kassel.de/go/vs_stephan-opfer/ > > _______________________________________________ > zeromq-dev mailing list > [email protected] > https://lists.zeromq.org/mailman/listinfo/zeromq-dev > -- Studying for the Turing test
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