Nevermind. I copied my ISP's line verbatim, including the erroneous /112 mask.
On Friday, March 30, 2012 1:27pm, "Steve Snyder" <swsnyder@xxxxxxxxxxxxx> said:
> I can't get IPv6 routing to configure correctly despite everything I've read
> saying it should
>
> This is my network config on a fully-updated CentOS 5.8 system:
>
> # cat /etc/sysconfig/network
> NETWORKING=yes
> NETWORKING_IPV6=yes
> HOSTNAME=my.hostname.com
> GATEWAY=aaa.bbb.ccc.ddd
> IPV6_DEFAULTGW=2a02:aaaa.bbbb::1
> IPV6_DEFAULTDEV=eth0
>
> # cat /etc/sysconfig/network-scripts/ifcfg-eth0
> ONBOOT=yes
> DEVICE=eth0
> BOOTPROTO=static
> HWADDR=52:54:00:68:42:1E
> IPADDR=000.111.222.333
> NETMASK=255.255.255.128
> IPV6INIT=yes
> IPV6ADDR=2a02:aaaa.bbbb:178:209:50:230:0/112
>
> Attempts to use the IPv6 address fail. For example:
>
> # ping6 -c 2 2a00:1450:4016:800::1013
> connect: Network is unreachable
>
> However it works if I manually enter these 2 lines:
>
> # route -A inet6 add ::/0 dev eth0
> # ip -6 route add 2000::/3 via 2a02:aaaa.bbbb::1 metric 1
>
> # ping6 -c 2 2a00:1450:4016:800::1013
> PING 2a00:1450:4016:800::1013(2a00:1450:4016:800::1013) 56 data bytes
> 64 bytes from 2a00:1450:4016:800::1013: icmp_seq=0 ttl=57 time=91.2 ms
> 64 bytes from 2a00:1450:4016:800::1013: icmp_seq=1 ttl=57 time=95.3 ms
>
> These are the routing table entries added by my hand-added configuration:
>
> 2000::/3 via 2a02:418:6a04::1 dev eth0 metric 1 expires 21333054sec mtu 1500
> advmss 1440 hoplimit 4294967295
> default dev eth0 metric 1 expires 21333054sec mtu 1500 advmss 1440 hoplimit
> 4294967295
>
>
> So... given the parameters set in my config files, why are the CentOS v5.8
> initscripts not configuring my IPv6 routing correctly?
>
> One more thing. I get this output on network start up (prior to
> hand-configuration):
>
> Bringing up interface eth0: WARN : [ipv6_add_route] 'No route to host' adding
> route '::/0' via gateway '2a02:aaaa.bbbb::1' through device 'eth0'
>
> Thanks.
>
>
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>
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