Problems with IPV6 routing table in Red Hat Enterprise Linux 6 - Red Hat Customer Portal

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Issue

IPV6 routing table not updated with many interfaces or ipv6 clients
Why only about 2000 ipv6 alias addresses could be added to a net interface?

By default only about 2000 ipv6 alias addresses could be added to a net interface, then error message like below shows up.
```
[root@wwwx ~]# ip -6 addr add 2001:4860:0:2001::3001  dev lo
RTNETLINK answers: Cannot allocate memory
```
can we add more ipv6 address to a network interface?

Environment

Red Hat Enterprise Linux (RHEL) 6

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