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Implemented ability to change MTU.

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Mark Qvist 2021-09-02 18:00:03 +02:00
parent 40f7a6d359
commit cd8de64201
5 changed files with 40 additions and 24 deletions
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25
RNS/Reticulum.py
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@ -36,15 +36,24 @@ class Reticulum:
other programs to use on demand.
"""
# The default RNS MTU is 500 bytes. This number has been chosen as
# a balance between compatibility with existing hardware devices
# on one hand, and the ability to use sufficiently high cryptographic
# key sizes on the other. In custom RNS network implementations, it
# is possible to raise this value, but doing so will completely break
# compatibility with all other RNS networks. An identical MTU is a
# prerequisite for peers to communicate in the same network.
MTU = 500
HEADER_MAXSIZE = 23
"""
The MTU that Reticulum adheres to, and will expect other peers to
adhere to. By default, the MTU is 500 bytes. In custom RNS network
implementations, it is possible to change this value, but doing so will
completely break compatibility with all other RNS networks. An identical
MTU is a prerequisite for peers to communicate in the same network.
The absolute minimum MTU that Reticulum will function with is 215 bytes,
but bandwidth efficiency will be significantly impacted.
"""
# Length of truncated hashes in bits.
TRUNCATED_HASHLENGTH = 80
HEADER_MINSIZE = 2+1+(TRUNCATED_HASHLENGTH//8)*1
HEADER_MAXSIZE = 2+1+(TRUNCATED_HASHLENGTH//8)*2
MDU = MTU - HEADER_MAXSIZE
router = None