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

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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  1. 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

  2. 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

  3. 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

  4. 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

  5. Cumulative ASCONF chunks • On sending ASCONF chunks, if there are any outstanding ASCONFs, bind them up! draft-marushin-sctp-asconfext-01.txt

  6. 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

  7. Questions? draft-marushin-sctp-asconfext-01.txt

  8. draft-marushin-sctp-asconfext-01.txt

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