dhcpd doesn't answer to DHCPv6 requests

[Nejc Skoberne]

Dear list,

oh wait, there is also ip6tables. Nevermind.

Thanks,
Nejc

-----Original Message-----
From: dhcp-users-bounces+nejc=viris.si at lists.isc.org
[mailto:dhcp-users-bounces+nejc=viris.si at lists.isc.org] On Behalf Of Nejc
Skoberne
Sent: Wednesday, April 21, 2010 2:49 PM
To: dhcp-users at lists.isc.org
Subject: dhcpd doesn't answer to DHCPv6 requests

Dear list,

I have a virtualized test enviroment and I want to establish a IPv6-only
test LAN. The  environment consists of a Linux (Fedora 10) gateway and a
Windows 7 and Ubuntu Linux clients.

My problem is, that dhcpd, which is running on Fedora gateway is not
replying to DHCPv6 requests. My configuration:

dhcpd6.conf:
---------------------------------------------------------------------
default-lease-time 1800;
max-lease-time 7200;
authoritative;

option dhcp.domain-search "domain.local"; option dhcp6.domain-search
"domain.local"; option dhcp6.name-servers 2001:470:1f0b:1002::1;

subnet6 2001:470:1f0b:1002::/64 {
    allow unknown-clients;
    default-lease-time 1800;
    min-lease-time 4000;
    max-lease-time 7200;

    range6 2001:470:1f0b:1002::1:0/112;
}

# I have also tried to toggle this part
host win7 {
    host-identifier option dhcp6.client-id
"00:01:00:01:13:3a:fe:84:00:0c:29:f1:34:dc";
    fixed-address6 2001:470:1f0b:1002::2:1; }
---------------------------------------------------------------------

radvd.conf
---------------------------------------------------------------------
interface eth1
{
        AdvSendAdvert on;
        AdvLinkMTU 1280;
        MinRtrAdvInterval 30;
        MaxRtrAdvInterval 100;
	  # Also tried to toggle AdvOtherConfigFlag
        AdvOtherConfigFlag on;
        AdvManagedFlag on;
        prefix 2001:470:1f0b:1002::/64
        {
                AdvOnLink on;
                AdvAutonomous on;
                AdvRouterAddr off;
        };

};
---------------------------------------------------------------------

# ifconfig eth1
---------------------------------------------------------------------
eth1      Link encap:Ethernet  HWaddr 00:0C:29:1F:7B:C3
          inet6 addr: 2001:470:1f0b:1002::1/64 Scope:Global
          inet6 addr: fe80::20c:29ff:fe1f:7bc3/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:727 errors:0 dropped:0 overruns:0 frame:0
          TX packets:123 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:87138 (85.0 KiB)  TX bytes:17294 (16.8 KiB)
          Interrupt:19 Base address:0x2080
---------------------------------------------------------------------

This is what I see if I do tcpdump on gateway when doing DHCPv6 client
requests on client machines:

---------------------------------------------------------------------
[root at nat64-gw dhcp]# tcpdump -n -i eth1
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
14:28:58.430008 IP6 fe80::20c:29ff:fef8:972f.dhcpv6-client >
ff02::1:2.dhcpv6-server: dhcp6 inf-req
14:29:00.508880 IP6 fe80::20c:29ff:fef8:972f.dhcpv6-client >
ff02::1:2.dhcpv6-server: dhcp6 inf-req
14:29:01.604012 IP6 fe80::20c:29ff:fef8:972f.dhcpv6-client >
ff02::1:2.dhcpv6-server: dhcp6 inf-req
---------------------------------------------------------------------

This is what dhcpd startup looks like:

---------------------------------------------------------------------
Apr 21 14:46:13 gw dhcpd: Internet Systems Consortium DHCP Server 4.1.1 Apr
21 14:46:13 gw dhcpd: Copyright 2004-2010 Internet Systems Consortium.
Apr 21 14:46:13 gw dhcpd: All rights reserved.
Apr 21 14:46:13 gw dhcpd: For info, please visit
https://www.isc.org/software/dhcp/
Apr 21 14:46:13 gw dhcpd: Not searching LDAP since ldap-server, ldap-port
and ldap-base-dn were not specified in the config file Apr 21 14:46:13 gw
dhcpd: Wrote 0 deleted host decls to leases file.
Apr 21 14:46:13 gw dhcpd: Wrote 0 new dynamic host decls to leases file.
Apr 21 14:46:13 gw dhcpd: Wrote 0 leases to leases file.
Apr 21 14:46:13 gw dhcpd: Bound to *:547 Apr 21 14:46:13 gw dhcpd: Listening
on Socket/5/eth1/2001:470:1f0b:1002::/64
Apr 21 14:46:13 gw dhcpd: Sending on   Socket/5/eth1/2001:470:1f0b:1002::/64
Apr 21 14:46:13 gw dhcpd:
Apr 21 14:46:13 gw dhcpd: No subnet6 declaration for eth0
(fe80::20c:29ff:fe1f:7bb9).
Apr 21 14:46:13 gw dhcpd: ** Ignoring requests on eth0.  If this is not what
Apr 21 14:46:13 gw dhcpd:    you want, please write a subnet6 declaration
Apr 21 14:46:13 gw dhcpd:    in your dhcpd.conf file for the network segment
Apr 21 14:46:13 gw dhcpd:    to which interface eth0 is attached. **
Apr 21 14:46:13 gw dhcpd:
---------------------------------------------------------------------

There are no iptables rules and the default policy for all the tables is
ACCEPT. If I configure IPv4 DHCP, everything is OK, the machines get the
addresses and the parameters.

What could be the problem?

Thanks,
Nejc


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