DHCP mit IPv6

Hallo zusammen,

ich hätte da mal gern ein Problem :-)

Ich versuche gerade meinen Verbund von CentOs 7.2 Maschinen auf IPv6 umzustellen und scheitere kläglich am DHCP.
Mein DHCP ist konfiguriert und tut auch seinen Job - nur eben falsch. Die Clients bekommen immer eine IPv6 Adresse mit der SNM /128. Dadurch sind sie im Netzwerk nicht erreichbar. Konfiguriert hatte ich eine /64 Adressen (zumindest glaube ich das)
Verbindungen über IPv4 funktionieren ganz normal.

Meine Konfiguration sieht wie folgt aus:

DHCP-Server:Netzwerk Konfiguration:
2 Netzwerkadapter: enp0s3 (Verbindung nach außen), enp0s8 (internes Lan für die VMs)
IPv6 Adressen sollen nur über enp0s8 verteilt werden

Code:

[root@VMDH01 ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp0s8 TYPE=Ethernet BOOTPROTO=static DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=no IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no NAME=enp0s8 UUID=c91b0d9d-5a8a-49c5-bd95-f668d1a26ff6 DEVICE=enp0s8 ONBOOT=yes IPADDR=10.0.1.1 PREFIX=24 IPV6ADDR=2001:1000:aaaa:100::1/64 IPV6_PRIVACY=no

Die Ausgabe mit

Code:

ip a

sie wie folgt aus:

Code:

[root@VMDH01 ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 08:00:27:cb:27:ec brd ff:ff:ff:ff:ff:ff inet 10.4.10.47/16 brd 10.4.255.255 scope global dynamic enp0s3 valid_lft 863277sec preferred_lft 863277sec inet6 fd00::a00:27ff:fecb:27ec/64 scope global noprefixroute dynamic valid_lft 7043sec preferred_lft 3443sec inet6 fe80::a00:27ff:fecb:27ec/64 scope link valid_lft forever preferred_lft forever 3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 08:00:27:b8:44:d9 brd ff:ff:ff:ff:ff:ff inet 10.0.1.1/24 brd 10.0.1.255 scope global enp0s8 valid_lft forever preferred_lft forever inet6 2001:1000:aaaa:100::1/64 scope global valid_lft forever preferred_lft forever inet6 fe80::a00:27ff:feb8:44d9/64 scope link valid_lft forever preferred_lft forever

Die /etc/dhcp/dhcpd6.conf sie wie folgt aus:

Code:

[root@VMDH01 ~]# cat /etc/dhcp/dhcpd6.conf # # DHCPv6 Server Configuration file. # see /usr/share/doc/dhcp*/dhcpd6.conf.example # see dhcpd.conf(5) man page # # IPv6 address valid lifetime # (at the end the address is no longer usable by the client) # (set to 30 days, the usual IPv6 default) default-lease-time 2592000; # IPv6 address preferred lifetime # (at the end the address is deprecated, i.e., the client should use # other addresses for new connections) # (set to 7 days, the usual IPv6 default) preferred-lifetime 604800; # T1, the delay before Renew # (default is 1/2 preferred lifetime) # (set to 1 hour) option dhcp-renewal-time 3600; # T2, the delay before Rebind (if Renews failed) # (default is 3/4 preferred lifetime) # (set to 2 hours) option dhcp-rebinding-time 7200; # Enable RFC 5007 support (same than for DHCPv4) allow leasequery; # Global definitions for name server address(es) and domain search list option dhcp6.name-servers fd00::a96:d7ff:fe16:3b89; option dhcp6.domain-search "fritz.box"; # Set preference to 255 (maximum) in order to avoid waiting for # additional servers when there is only one option dhcp6.preference 255; # Server side command to enable rapid-commit (2 packet exchange) option dhcp6.rapid-commit; # The delay before information-request refresh # (minimum is 10 minutes, maximum one day, default is to not refresh) # (set to 6 hours) option dhcp6.info-refresh-time 21600; # The path of the lease file dhcpv6-lease-file-name "/var/lib/dhcpd/dhcpd6.leases"; # (i.e., the server has an address in this subnet) subnet6 2001:1000:aaaa:100::/64 { range6 2001:1000:aaaa:100::10 2001:1000:aaaa:100::210; # Use the whole /64 prefix for temporary addresses # (i.e., direct application of RFC 4941) # range6 3ffe:501:ffff:100:: temporary; # Some /64 prefixes available for Prefix Delegation (RFC 3633) prefix6 2001:1000:aaaa:100:: 2001:1000:aaaa:101:: /64; }

Konfiguration auf dem Client:
Netzwerkadapter: enp0s3 (internes lan)

Code:

[root@VMKI01 ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp0s3 TYPE="Ethernet" BOOTPROTO="dhcp" DEFROUTE="yes" IPV4_FAILURE_FATAL="no" IPV6INIT="yes" IPV6_AUTOCONF=no IPV6_DEFROUTE="yes" IPV6_FAILURE_FATAL="no" NAME="enp0s3" UUID="4591512f-da12-4772-89c1-73dc6c816eb1" DEVICE="enp0s3" ONBOOT="yes" PEERDNS=yes PEERROUTES=yes DHCPV6C=yes

Die Ausgabe mit

Code:

ip a

sieht wie folgt aus:

Code:

[root@VMKI01 ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 08:00:27:0c:0d:53 brd ff:ff:ff:ff:ff:ff inet 10.0.1.4/24 brd 10.0.1.255 scope global dynamic enp0s3 valid_lft 436sec preferred_lft 436sec inet6 2001:1000:aaaa:100::210/128 scope global dynamic valid_lft 2591838sec preferred_lft 604638sec inet6 fe80::a00:27ff:fe0c:d53/64 scope link valid_lft forever preferred_lft forever

Auch verstehe ich nicht, das die letzte Adresse aus der IP-Range vergeben wird, statt der ersten.

Ich bin für jede Hilfe Danke.

Viele Güße