An extension to add ip draft to send cumulative asconf chunks draft marushin sctp asconfext 01 txt
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An extension to ADD-IP draft to send cumulative ASCONF chunks draft-marushin-sctp-asconfext-01.txt. Shin Maruyama (Kyoto Univ., JAPAN) Masahiro Kozuka (Kyoto Univ., JAPAN). Limitation on ASCONF transmission. Sending new ASCONF chunk is prohibited if outstanding ASCONF chunk exists.

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An extension to ADD-IP draft to send cumulative ASCONF chunks draft-marushin-sctp-asconfext-01.txt

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An extension to ADD-IP draft to send cumulativeASCONF chunksdraft-marushin-sctp-asconfext-01.txt

Shin Maruyama (Kyoto Univ., JAPAN)

Masahiro Kozuka (Kyoto Univ., JAPAN)

draft-marushin-sctp-asconfext-01.txt


Limitation on ASCONF transmission

  • Sending new ASCONF chunk is prohibitedif outstanding ASCONF chunk exists.

  • No modification on queued ASCONFs

draft-marushin-sctp-asconfext-01.txt


A typical scenario to break an association

  • “Node A” supports IPv4 and IPv6 address

  • “Node B” supports only IPv4

  • “Node A” first loses IPv4 address and then get another IPv4 address.

Node A

Node B

IPv4

IPv6

IPv4

1.

Node A loses IPv4 address

Node A only has IPv6 address,

ASCONF cannot be sent out

ASCONF

DEL-IP(IPv4)

2.

Once this happens, following

ASCONFs are also blocked

ASCONF

ADD-IP(IPv4)

3.

draft-marushin-sctp-asconfext-01.txt


Another Typical Scenario

  • Node has a single interface and an IP address, and the interface goes down.

  • The node get another address, but the address is disconnected.

Node loses IP1

1.

IP1

ASCONF

Get unreachable address IP2, ASCONF-ACK never returned

IP1IP2

2.

ASCONF-ACK

3.

Get another reachable address IP3, but ASCONF cannot be sent out

ASCONF

ADD-IP(IP3)

draft-marushin-sctp-asconfext-01.txt


Cumulative ASCONF chunks

  • On sending ASCONF chunks, if there are any outstanding ASCONFs, bind them up!

draft-marushin-sctp-asconfext-01.txt


Some Remarks

  • On bundling ASCONFs, all the outstanding ASCONFs must be bundled in order.

  • ASCONF_ACK must be returned to the source address of bundled ASCONFs

  • Receiver must return ASCONF_ACKs for all ASCONFS bundled even when some of themhave already processed.

    • ASCONF_ACK should be cached until the sender is assumed to have received it.

  • ASCONF_ACK should also be bundled.

draft-marushin-sctp-asconfext-01.txt


Questions?

draft-marushin-sctp-asconfext-01.txt


draft-marushin-sctp-asconfext-01.txt


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