[CentOS] IPv6 routing failure on CentOS5

Steve Snyder swsnyder at snydernet.net
Fri Mar 30 14:00:28 EDT 2012


Nevermind.  I copied my ISP's line verbatim, including the erroneous /112 mask.


On Friday, March 30, 2012 1:27pm, "Steve Snyder" <swsnyder at snydernet.net> 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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