Status: New
Owner: ----
Labels: Type-Defect Priority-Medium Component-SS7 Roadmap-Fix
New issue 331 by [email protected]: Can not define multi-homed peers
http://code.google.com/p/jss7/issues/detail?id=331
Hello,
We are developing a SIGTRAN app using Mobicents Stack and realize that is
not possible to define multi-homed peers. Yes, We know that once SCTP
INIT-ACK is received, all ip´s of the multi-homed peer are received and
registered by Mobicent Stack.
But, what if remote primary IP is not available?, so, response (INIT-ACK)
to INIT message will not be received, and, in consequence, SCTP connection
will not be established.
According to standard SCTP connection initiation protocol should behave in
this way:
Initial Association Establishment.
The first phase is initial association establishment: it is always executed
toward one remote IP address and can be repeated for a specified number of
times . In case of a missing answer to the first attempt, more attempts are
performed by changing the local IP address for each new attempt.
So, considering the above general scenario and assuming that B1 is the
first remote IP address on peer that is going to be attempted, the sequence
is:
1. A1 -> B1
2. A2 -> B1
3. A1 -> B1
4. A2 -> B1 ... and so on, until reach maximum number of times.
At the first successful answer, the association is established.
In the case that B1 is not answering, B2 is attempted, with the same
rotation of source addresses as follows:
1. A1 -> B2
2. A2 -> B2
3. A1 -> B2
4. A2 -> B2 ... and so on, until reach maximum number of times or B2
answers.
If the SCTP association is finally established, a primary SCTP path is
established and the reconfiguration is such that the primary source IP
address is the first IP address defined in the endpoint definition.
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