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#### Description
When a destination is selected using one of the hash algorithms (over Call-ID, From, etc.)
and destination is not available, then the next is selected. This causes the following problem :
All messages to the unavailable destination will be sent to the same unique destination.
This will cause that one destination will receive double load and the rest will continue with the same.
Solution : To better distribute messages, while also guaranteeing the same distribution of the hash, a re-hash of the hash is made.
As the rehash could select the same or other failed destination, it can rehash several times. The number of rehashes made is controlled by :
modparam("dispatcher", "ds_rehash_max", -1)
Which can take the following values :
-1 : The total count of destinations is used
0 : Disabled. Reverts to original implementation.
Positive number. Maximum number of rehashes.
You can view, comment on, or merge this pull request online at:
https://github.com/kamailio/kamailio/pull/2363
-- Commit Summary --
* dispatcher : better distribution when using hash and destination is not available
-- File Changes --
M src/modules/dispatcher/dispatch.c (49)
M src/modules/dispatcher/dispatcher.c (2)
-- Patch Links --
https://github.com/kamailio/kamailio/pull/2363.patchhttps://github.com/kamailio/kamailio/pull/2363.diff
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Loading nathelper module comes with some overhead (including an extra timer process for nat pinging), but even we can live with that, I think it is better to do symmetric signaling by default, because this is like 99% of what I could spot out there so far. The asymmetric singaling should be done for trusted/known peers only, otherwise it expose the system to become part to sort of "reflection" attack -- e.g., send OPTIONS to SIP server to make it flood a particular target with replies by setting Via to the target address.
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Sorry for a lack of clarity in my response. What I tried to patch is the bug that it did not delete all rows, or as expressed clearly by @miconda and @henningw, a unfiltered delete of all rows.
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Kamailio adds IP addresses in the record route. When one updates the config to use domains from aliases in record route, other changes have to be done. I do not want to have the config an alternative source for documentation.
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