Re: sctp multihoming query

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Hi,

you really want to be asking this on the TSVWG list. CC and Reply-To set accordingly.

Lars

On 2009-12-4, at 1:57, Sudhanva Mudigere Narayana Gowda wrote:

> Hi,
> I have a query regarding sctp multihoming behavior.
> 
> I have setup a multihomed association and this is my observation
> 
> Host_A (IP a): Local single Homed endpoint
> 
> Host_B (IP b(Primary), IP c(secondary)): Remote multiHomed endpoint
> 
> During Heartbeat I see that even though the Heart beat req is to the secondary ip of Host_B, the Host_B uses its primary ip as source when sending back the Heartbeat Ack.
> Ie  Host_A (IP a) --------HEART_BEAT_REQ-----------> Host_B(IP c)
>     Host_A (IP a)<--------- HEART_BEAT_ACK---------- Host_B(IP b)
> 
> also during data exchange I observed that even when the data is sent to the secondary ip of Host_B, the SACK is being sent back from the primary ip of Host_B.
>  Host_A (IP a) --------DATA_MSG-----------> Host_B(IP c)
>  Host_A (IP a)<--------- SACK------------------- Host_B(IP b)
> 
> Is this the expected behavior, shouldn’t the node use the same ip on which it received the data or Heart_beat_req on while sending back the responses(Heart_beat_ack or SACK).
> Due to this behavior if the primary ip of an endpoint fails the association goes down as the node will not be able to transmit any Heartbeat_Req or Heartbeat_Ack.
> 
> On Host_A I blocked the incoming packets which has Host_B(IP b) as source and I expected Host_B to retry using its secondary ip addr, but I observed that even the retries from Host_B uses its primary ip .
> 
> Does this mean that an endpoint always uses its primary-ip while sending packets, but might receive packets on primary or secondary-ip?
> 
> Thanks
> Sudhanva
> <ATT00001..txt>

<<attachment: smime.p7s>>

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