Problem with dhcpd6 configuration

scott_stone at trendmicro.com scott_stone at trendmicro.com
Mon Oct 3 20:51:42 UTC 2011


I'm trying to serve DHCPv6 clients on several subnets - but I will settle for getting the server to even start, to begin with.

 

Servers are running CentOS 5.6 with a built-from-source ISC-DHCPD 4.2.2 with standard options.  

 

Here's the interface configuration (the 'fffa' and 'fffb' addresses were added by us, the 'scope link' and 'scope global dynamic' seem to be getting auto-set).

 

6: eth4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

    link/ether 00:26:9e:58:48:30 brd ff:ff:ff:ff:ff:ff

    inet 10.31.55.241/24 brd 10.31.55.255 scope global eth4

    inet 10.31.55.244/24 brd 10.31.55.255 scope global secondary eth4:0

    inet6 2620:101:4037:3b05:226:9eff:fe58:4830/64 scope global dynamic 

       valid_lft 2591861sec preferred_lft 604661sec

    inet6 2620:101:4037:3b05:fffa::1/64 scope global 

       valid_lft forever preferred_lft forever

    inet6 2620:101:4037:3b05:fffb::1/64 scope global 

       valid_lft forever preferred_lft forever

    inet6 fe80::226:9eff:fe58:4830/64 scope link 

       valid_lft forever preferred_lft forever

 

Here's the dhcpd6.conf:

 

ddns-update-style none;

ddns-updates off;

allow booting;

allow bootp;

authoritative;

log-facility local6;

default-lease-time 604800;

max-lease-time 604800;

min-lease-time 604800;

 

# VLAN1055

subnet6 2620:101:4037:3B05::/64 {

               pool {

                              default-lease-time 3600;

                              min-lease-time 60;

                              max-lease-time 3600;

                              range6 2620:101:4037:3B05:FFFF::1 2620:101:4037:3B05:FFFF::FFFF;

               }

}

 

And here's what I get when I try to start dhcpd6:

 

Oct  3 20:31:02 dcs-ipmaster1 dhcpd: No subnet6 declaration for eth4 (2620:101:4037:3b05:226:9eff:fe58:4830).

Oct  3 20:31:02 dcs-ipmaster1 dhcpd: ** Ignoring requests on eth4.  If this is not what

Oct  3 20:31:02 dcs-ipmaster1 dhcpd:    you want, please write a subnet6 declaration

Oct  3 20:31:02 dcs-ipmaster1 dhcpd:    in your dhcpd.conf file for the network segment

Oct  3 20:31:02 dcs-ipmaster1 dhcpd:    to which interface eth4 is attached. **

 

and if I temporarily "ip addr del" that ipv6 address, it gives me the same error but complains about the 'scope local' address as well.  I've tried searching all over the web for a solution to this but I can't seem to figure out what's going wrong.  The now-deprecated dhcp6s seemed to work OK with a similar configuration but I'm at a loss as to what to try next here.  Thanks in advance for your help.

 

====================

Scott Stone <scott_stone at trendmicro.com>

Manager, DCS-RD

Trend Micro, Inc. http://www.trendmicro.com

 


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