Hallo,
I have a query related to SCT Mulithoming communication paths.
Host-X: (IPpx IPax): Multihomed Association with Host-Y (IPpy IPay).
Host-X SCTP Client is running with SCTP stack provided by Vendor X
Host-Y SCTP Server is running with SCTP stack provided by Vendor Y.
Notation.
IPpx means IP Address of Primary path on Host-X
IPax means IP Address of Alternate path on Host-X
IPpy means IP Address of Primary path on Host-Y
IPpy means IP Address of Primary path on Host-Y
Host-X is Communicating as follows :-
-------------------------------------------------------
Primary IP to Primary IP
Host-X(IPpx)--------HBEAT---------->Host-Y(IPpy)
Host-X(IPpx)<-------HBEAT-ACK------Host-Y(IPpy)
Alternate IP to Alternate IP
Host-X(IPax)--------HBEAT---------->Host-Y(IPay)
Host-X(IPax)<-------HBEAT-ACK------Host-Y(IPay)
/*
* Host-X installed in Customer network.
* Customer Network not configured/ not capable to deliver to destination
* in the following two paths. I do not know if they have special requirement
* to configure their network only primary talks to primary and alternate talks
* to alternate, but I see disadvantage in their setup.
* Host-X keeps on trying to reach every Destination received in the
* INIT_ACK message from Host-Y
*
*/
Primary to Alternate Address
Host-X(IPpx)--------HBEAT---------->Host-Y(IPay) (DOES N0T REACH IPay)
Host-X(IPax)--------HBEAT---------->Host-Y(IPpy) (DOES NOT REACH IPpy)
Now Host-X was forced to configured Path Max Retransmissions and Max Init
Retransmissions to value of 5, while RTO Initial and RTO MAX value is set to 1
second.
This results
1. to mark the destination endpoint IPay as NETWORK DOWN on Host-X when it
exceeds max retranmission in same path(cross) consecutively and
2. then sends INIT from IPpx to IPpy and also IPpx to IPay and as soon as it
gets the response from any destination(in customer nework only from IPpy) it
is marked as NETWORK UP,
3. but soon or later we receive again NETWORK DOWN and same repeats from step 1.
Now the query is,
Is it right to tell custome Network to re-configure their network to allow
cross communication ?
OR
Is it MUST to change the Host-X stack to stop communicating Cross
i.e., IPpx trying to reach IPay.
Advantage that I see from Host-X Stack :
I also see an advantage with Host-X tranport addresses IPs trying to reach
every destination
of the peer. The advantage is If the path between the Host-Y(IPpy) and its
next hop is broken and
If the path between Host-X(IPax) and its next hop is broken still Multihoming
makes real sense and
could cope up with such breakdown in network while
Host-X(IPpx)------->Host-Y(IPay)
If I overlook any other disadvantage of Host-X stack, please correct me.
Looking forward for your suggestion from your expert knowledge. If something
not clear please feel to ask me.
Thanks in advance.
Thanks,
samba.
Sambasiva Rao Manchili
Software Development Engineer
________________________________
NEXUS TELECOM AG
Network and Service Investigation
Muertschenstrasse 25
P.O. Box 1413
CH-8048 Zurich
Switzerland
Direct/mobile: +41 78 750 6808
Main: +41 44 355 6611
Email: sambasiva(_dot_)manchili(_at_)nexustelecom(_dot_)com
<mailto:sambasiva(_dot_)manchili(_at_)nexustelecom(_dot_)com>
Website: www.nexustelecom.com<http://www.nexustelecom.com/>
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