IPv6 Reassembly and Fragmentation Support

As it does for IPv4, the Oracle® Enterprise Session Border Controller supports reassembly and fragmentation for large signaling packets when you enable IPV6 on your system.

The Oracle® Enterprise Session Border Controller takes incoming fragments and stores them until it receives the first fragment containing a Layer 4 header. With that header information, the Oracle® Enterprise Session Border Controller performs a look-up so it can forward the packets to its application layer. Then the packets are re-assembled at the applications layer. Media fragments, however, are not reassembled and are instead forwarded to the egress interface.

On the egress side, the Oracle® Enterprise Session Border Controller takes large signaling messages and encodes it into fragment datagrams before it transmits them.

Note that large SIP INVITE messages should be sent over TCP. If you want to modify that behavior, you can use the SIP interface’s option parameter max-udp-length=xx for each SIP interface where you expect to receive large INVITE packets.

Other than enabling IPv6 on your Oracle® Enterprise Session Border Controller, there is no configuration for IPv6 reassembly and fragmentation support. It is enabled automatically.