Avaya 9600 Series - Page 63

supporting IPv6 on page 64. Any additional limitation or bugs discovered within this release
will be considered for resolution in future major releases.
From Release 6.0 onwards, Internet Protocol (IP) operation determination follows this order:
• If NVVPNMODE parameter value is set to 1 (Yes) only IPv4 operation is enabled.
• If NVVPNMODE is set to 0 (No), the IPv6 status IPV6STAT parameter is checked to see if
IPv6 is allowed; if set to 0 (No) then only IPv4 operation is enabled.
• If IPV6STAT is set to 1 (support IPv6), then the DHCPSTAT parameter is checked:
- If DHCPSTAT is set to 1 (use DHCPv4 only) then IPv4 only is enabled. But if an IPv6
address was manually programmed, dual-stack operation is enabled.
- If DHCPSTAT is set to 2 (use DHCPv6 only) then IPv6 only is enabled. But if an IPv4
address was manually programmed, dual-stack operation is enabled.
- If DHCPSTAT is set to 3 (both IPv4 and IPv6 supported), then dual-stack operation is
enabled.
If IPv4-only operation is enabled, the system ignores any IPv6 addresses configured as parameter
values and uses the next IPv4 address in the list. If the parameter value does not contain any IPv4
addresses, the system treats the value as null.
If IPv6-only operation is enabled, any IPv4 addresses configured as parameter values are ignored,
and the next IPv6 address (if any) in a list of addresses is used. If the parameter value does not
contain any IPv6 addresses, the system treats the value as null.
The results of the determination are expressed in the following table.
Table 8: IP Enablement Results
Manually
program-
med IPv4
address?
IPV6STAT Manually
programmed
IPv6 address
DHCPSTAT Result Addressing Mode(s)
IPv4 IPv6
No 0 N/A n/a IPv4 only DHCP n/a
1 No
Yes
1
2
3
1 or 3
2
IPv4 only
IPv6 only
dual-stack
dual-stack
IPv6 only
DHCP
n/a
DHCP
DHCP
n/a
n/a
DHCPv6
DHCPv6
manual
manual
Yes 0 n/a n/a IPv4 only manual n/a
1 No
Yes
1
2 or 3
n/a
IPv4 only
dual-stack
dual-stack
manual
manual
manual
n/a
DHCPv6
manual
In general, if dual-stack operation is enabled, whether IPv4 or IPv6 is to be used to contact a
server is determined by the value of the parameter that contains the server address(es). However,
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