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>=5.0
random - In kernel 5.0 and newer this is the same as fully-random. In earlier
kernels the port mapping will be randomized using a seeded MD5 hash mix using
source and destination address and destination port.
https://git.netfilter.org/nftables/commit/?id=fbe27464dee4588d906492749251454
(cherry picked from commit 7fe568ca1672f1dfbd2b56ee3ef7a6ab48b03070)
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Since introducing the XML <defaultValue> node it was common, but redundant,
practice to also add a help string indicating which value would be used as
default if the node is unset.
This makes no sense b/c it's duplicated code/value/characters and prone to
error. The node.def scripts should be extended to automatically render the
appropriate default value into the CLI help string.
For e.g. SSH the current PoC renders:
$ cat templates-cfg/service/ssh/port/node.def
multi:
type: txt
help: Port for SSH service (default: 22)
val_help: u32:1-65535; Numeric IP port
...
Not all subsystems are already migrated to get_config_dict() and make use of
the defaults() call - those subsystems need to be migrated, first before the new
default is added to the CLI help.
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and port
Tested using:
set destination rule 100 inbound-interface 'eth0'
set destination rule 100 translation address '19.13.23.42'
set destination rule 100 translation options address-mapping 'random'
set destination rule 100 translation options port-mapping 'none'
set source rule 1000 outbound-interface 'eth0'
set source rule 1000 translation address '122.233.231.12'
set source rule 1000 translation options address-mapping 'persistent'
set source rule 1000 translation options port-mapping 'fully-random'
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