An OCaml TCP/IP networking stack

mirage-tcpip provides a networking stack for the Mirage operating system. It provides implementations for the following module types (which correspond with the similarly-named protocols):

  • ARP
  • IP (via the IPv4 and IPv6 modules)
  • ICMP
  • UDP
  • TCP


There are two implementations of the IP, ICMP, UDP, and TCP module types - the socket stack, and the direct stack.

The socket stack

The socket stack uses socket calls to a traditional operating system to provide the functionality described in the module types.

See the src/stack-unix/ directory for the modules used as implementations of the socket stack.

The socket stack is used for testing or other applications which do not expect to run as unikernels.

The direct stack

The direct stack expects to write to a device implementing the NETIF module type defined for MirageOS.

See the src/ directory for the modules used as implementations of the direct stack, which is the expected stack for most MirageOS applications.

The direct stack is the only usable set of implementations for applications which will run as unikernels on a hypervisor target.



mirage-tcpip is distributed under the ISC license.

Tags org:mirage
AuthorsAnil Madhavapeddy, Balraj Singh, Richard Mortier, Nicolas Ojeda Bar, Thomas Gazagnaire, Vincent Bernardoff, Magnus Skjegstad, Mindy Preston, Thomas Leonard, David Scott, Gabor Pali, Hannes Mehnert, Haris Rotsos, Kia, Luke Dunstan, Pablo Polvorin, Tim Cuthbertson, lnmx and pqwy
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