Re: [Xen-users] Follow up: eth0 not getting an inet4 addr using DHCP

[Unknown <digvijoy_chatterjee@xxxxxxxxxxx>]

This is what I did and it works although i don't understand:

I commented HWADDR in ifcfg-eth0 and restarted the network ,no go ,it took an inet-6 address and network was unreachable
then i did 
root@XenU# ifconfig eth0 down

root@XenU# ifconfig eth0 172.21.104.201  up     =====(i chose a  purely random Inet-4 addr in my subnet ) 

and lo i was connected to the network ,and my broadcast and netmask is different from Domain-0 
i simply dont understand how this is working and i am not too good in network fundamentals(all services httpd,sshd,etc..are working fine now)

root@XenU# ifconfig 

eth0      Link encap:Ethernet  HWaddr AA:00:00:46:84:E0
          inet addr:172.21.104.201  Bcast:172.21.255.255  Mask:255.255.0.0
          inet6 addr: fe80::a800:ff:fe46:84e0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2453 errors:0 dropped:0 overruns:0 frame:0
          TX packets:122 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:247257 (241.4 KiB)  TX bytes:15740 (15.3 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:560 (560.0 b)  TX bytes:560 (560.0 b)

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

[root@localhost Dom-0 ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0B:DB:55:7C:26
          inet addr:172.21.104.220  Bcast:172.21.104.255  Mask:255.255.255.0
          inet6 addr: fe80::20b:dbff:fe55:7c26/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:20554 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1991 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2123657 (2.0 MiB)  TX bytes:324885 (317.2 KiB)
          Base address:0xecc0 Memory:ff8e0000-ff900000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2500 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2500 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:164727 (160.8 KiB)  TX bytes:164727 (160.8 KiB)

vif1.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:84 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1981 errors:0 dropped:151 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:13496 (13.1 KiB)  TX bytes:189499 (185.0 KiB)

xen-br0   Link encap:Ethernet  HWaddr 00:0B:DB:55:7C:26
          inet addr:172.21.104.220  Bcast:172.21.104.255  Mask:255.255.255.255
          inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5038 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1802 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:379544 (370.6 KiB)  TX bytes:288410 (281.6 KiB)




On Thu, 2005-08-18 at 07:07 -0400, Derrik Pates wrote:
> Digvijoy Chatterjee wrote:
> > network restart doesnt help either :
> > 
> > [root@localhost ~]# service network restart
> > Shutting down interface eth0:  Device eth0 has different MAC address
> > than expected, ignoring.
> > [FAILED]
> > Shutting down loopback interface:  [  OK  ]
> > Bringing up loopback interface:  [  OK  ]
> > Bringing up interface eth0:
> > Determining IP information for eth0... failed.
> > [FAILED]
>
> You've just pointed out your own problem. Fedora/RH/CentOS network init
> scripts associate the original MAC address with the network
> configuration in /etc/sysconfig/network-scripts/ifcfg-eth*, and won't
> touch an interface that doesn't match. Either (a) set a static MAC in
> your domain configs and fix it in the interface config file, or (b)
> comment out or remove the line (which starts with 'HWADDR=', I think),
> and this problem will disappear.

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