In packet-switched computer networks, a jumbogram (portmanteau of jumbo and datagram) is an internet-layer packet exceeding the standard maximum transmission unit (MTU) of the underlying network technology.
In contrast, large packets for link-layer technologies are referred to as jumbo frames.
This theoretical limit for the Internet Protocol (IP) MTU, however, is reached only on networks that have a suitable link layer infrastructure.
While IPv4 has no facilities to exceed its theoretical IP MTU limit, the designers of IPv6 have provided a protocol extension to permit packets of larger size.
[1] Since after a number of years IPv6 jumbograms have not been widely deployed, some have proposed their removal from the standards.