ipv6 autoyast, wrong netmask in ifcfg-eth0

Hi,

We are using SLES11 SP2.
We are trying to setup ipv6 and ipv4 address on the same interface (eth0)
using autoyast installation:

using yast2 autoyast gui I've generated this autoyast.xml piece:
    <interface>
         <aliases>
           <alias0>
             <IPADDR>219.1.90.52</IPADDR>
             <NETMASK>255.255.255.128</NETMASK>
           </alias0>
         </aliases>
         <bootproto>static</bootproto>
         <device>eth0</device>
         <ipaddr>2a00:8a00:6000:40::451</ipaddr>
         <prefixlen>119</prefixlen>
         <startmode>auto</startmode>
         <usercontrol>no</usercontrol>
       </interface>


but after autoyast installation the config file (the field IPADDR) looks
crippled :
#/>cat /etc/sysconfig/network/ifcfg-eth0
BOOTPROTO='static'
IPADDR='2a00:8a00:6000:40::451/7'  <--- why is added '/7'
PREFIXLEN='119'
STARTMODE='auto'
USERCONTROL='no'
IPADDR_='219.1.90.52/25'

#/>ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:50:56:3F:AA:BC
           inet addr:219.1.90.52  Bcast:219.1.90.127 Mask:255.255.255.128
           inet6 addr: 2a00:8a00:6000:40::451/7 Scope:Global
           inet6 addr: fe80::250:56ff:fe3f:aabc/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:189 errors:0 dropped:0 overruns:0 frame:0
           TX packets:108 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:18440 (18.0 Kb)  TX bytes:21087 (20.5 Kb)


if we cut the '/7' prefix for IPADDR line, then everything works fine :
ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:50:56:3F:AA:BC
           inet addr:219.1.90.52  Bcast:219.1.90.127 Mask:255.255.255.128
           inet6 addr: 2a00:8a00:6000:40::451/119 Scope:Global


Could you please advice us why ipv6 netmask autoconfiguration is not working?

Best Regards,
Vladimir Ondrus
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