CentOS - Jul 2008 - Kernel is not compiled with IPv6 support?

How did I get this?

I am current on my 5.2 upgrades on this system.  Running kernel: 
2.6.18-92.1.6.el5

I did a service network restart and got:

Shutting down interface eth0:                              [  OK  ]
Shutting down loopback interface:                          [  OK  ]
FATAL: Module off not found.
CRITICAL : [ipv6_test] Kernel is not compiled with IPv6 support
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:  FATAL: Module off not found.
CRITICAL : [ipv6_test] Kernel is not compiled with IPv6 support
                                                           [  OK  ]
FATAL: Module off not found.
CRITICAL : [ipv6_test] Kernel is not compiled with IPv6 support


/etc/sysconfig/network has:

NETWORKING=yes
NETWORKING_IPV6=yes
HOSTNAME=onlo.htt-consult.com


and /etc/sysconfig/network-scripts/ifcfg-eth0 has:

DEVICE=eth0
BOOTPROTO=none
HWADDR=00:50:8B:A1:FE:1C
ONBOOT=yes
DHCP_HOSTNAME=onlo.htt-consult.com
IPADDR=208.83.67.148
NETMASK=255.255.255.248
GATEWAY=208.83.67.145
TYPE=Ethernet
USERCTL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
PEERDNS=no

A system on this subnet is supposedly running radvd.

> CRITICAL : [ipv6_test] Kernel is not compiled with IPv6 support
>                                                          [  OK  ]
> FATAL: Module off not found.
> CRITICAL : [ipv6_test] Kernel is not compiled with IPv6 support
Try looking inside /etc/modprobe.conf for these lines:
alias net-pf-10 off
alias ipv6 off

If those are in there then ipv6 will be disabled at boot.

Sean Carolan wrote:
>> CRITICAL : [ipv6_test] Kernel is not compiled with IPv6 support
>>                                                          [  OK  ]
>> FATAL: Module off not found.
>> CRITICAL : [ipv6_test] Kernel is not compiled with IPv6 support
>>     
>
> Try looking inside /etc/modprobe.conf for these lines:
> alias net-pf-10 off
> alias ipv6 off
>
> If those are in there then ipv6 will be disabled at boot.
Yep. They are there. So what is the 'proper' method to get them out 
(other than using VI and deleteing the lines?)?