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   <TITLE> [Mageia-dev] eth0 no longer interacts with DHCP at boot ?
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   <H1>[Mageia-dev] eth0 no longer interacts with DHCP at boot ?</H1>
    <B>Frank Griffin</B> 
    <A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20eth0%20no%20longer%20interacts%20with%20DHCP%20at%20boot%20%3F&In-Reply-To=%3C4F1EEC1A.4040708%40roadrunner.com%3E"
       TITLE="[Mageia-dev] eth0 no longer interacts with DHCP at boot ?">ftg at roadrunner.com
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    <I>Tue Jan 24 18:36:26 CET 2012</I>
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<PRE>Yet another recent strangeness that started sometime last week...

My system has a single, wired NIC (eth0) configured to be started at 
boot.  It is also configured to use DHCP and to get its hostname from 
the DHCP server.

For the last few days, when I boot, the interface comes up, but the 
hostname is set to localhost.localdomain, and there are no messages in 
syslog indicating that any DHCP requests are being sent.  I get to the 
network just fine, but ifconfig shows:

eth0      Link encap:Ethernet  HWaddr 00:0C:41:EE:E2:E1
           inet6 addr: fe80::20c:41ff:feee:e2e1/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:25770 errors:0 dropped:0 overruns:0 frame:0
           TX packets:24117 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:8936889 (8.5 MiB)  TX bytes:3339309 (3.1 MiB)
           Interrupt:21 Base address:0xe800

i. e. eth0 has no ipv4 IP address.  However, syslog *does* contain the line:

Jan 24 11:10:55 localhost kernel: eth0: no IPv6 routers present

So to whom is he talking ?  Moreover, looking at ifcfg-eth0:

DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
METRIC=10
MII_NOT_SUPPORTED=no
USERCTL=no
RESOLV_MODS=no
IPV6INIT=no
IPV6TO4INIT=no
ACCOUNTING=no
NM_CONTROLLED=no
DHCP_CLIENT=dhclient
NEEDHOSTNAME=yes
PEERDNS=yes
PEERYP=yes
PEERNTPD=no

IPv6 seems to be disabled completely.

If I ifdown/ifup eth0, things go back to normal:

eth0      Link encap:Ethernet  HWaddr 00:0C:41:EE:E2:E1
           inet addr:192.168.3.102  Bcast:192.168.3.255  Mask:255.255.255.0
           inet6 addr: fe80::20c:41ff:feee:e2e1/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:25979 errors:0 dropped:0 overruns:0 frame:0
           TX packets:24333 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:8971923 (8.5 MiB)  TX bytes:3392939 (3.2 MiB)
           Interrupt:21 Base address:0xe800

So what has changed in the boot-time interface starting procedure ?
</PRE>


































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