[CentOS] unable to add IP address to eth0:0 eth0:1 etc

umair shakil umairshakeel at gmail.com
Fri Sep 7 13:11:34 UTC 2007


Dear Ray,

Please assure me that:

/sbin/ifconfig eth0:0 xx.xx.xx.10 netmask 255.255.255.0

Is this the valid netmask "255.255.255.0" for static IP address for this
machine
you mentioned????

it will be "ifconfig eth0:0 xxxxx netmask 255.255.255.255"

Regards,

Umair Shakil
ETD

On 9/7/07, Ray Leventhal <centos at swhi.net> wrote:
>
> Hi all,
>
> I need to (quickly!grrr) update IP addresses for which a given machine
> will answer.
>
> I did this:
>
> /sbin/ifconfig eth0:0 xx.xx.xx.10 netmask 255.255.255.0
> /sbin/ifconfig eth0:1 xx.xx.xx.11 netmask 255.255.255.0
> /sbin/ifconfig eth0:2 xx.xx.xx.30 netmask 255.255.255.0
> /sbin/ifconfig eth0:3 xx.xx.xx.31 netmask 255.255.255.0
> /sbin/ifconfig eth0:4 xx.xx.xx.13 netmask 255.255.255.0
> /sbin/ifconfig eth0:5 xx.xx.xx.15 netmask 255.255.255.0
> /sbin/ifconfig eth0:6 xx.xx.xx.20 netmask 255.255.255.0
> /sbin/ifconfig eth0:7 xx.xx.xx.21 netmask 255.255.255.0
> /sbin/ifconfig eth0:8 xx.xx.xx.22 netmask 255.255.255.0
>
>
> but on looking at the output of /sbin/ifconfig, I see this:
>
> [root at sunspot ray]# /sbin/ifconfig
> eth0      Link encap:Ethernet  HWaddr 00:00:C5:C2:1B:01
>           inet addr:64.135.16.15  Bcast:64.135.16.255  Mask:255.255.255.0
>           inet6 addr: fe80::200:c5ff:fec2:1b01/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:5491775 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:962501 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:436018277 (415.8 MiB)  TX bytes:156248463 (149.0 MiB)
>           Interrupt:12 Base address:0xcf00
>
> eth0:0    Link encap:Ethernet  HWaddr 00:00:C5:C2:1B:01
>           inet addr:xx.xx.xx.10  Bcast:xx.xx.xx.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           Interrupt:12 Base address:0xcf00
>
> eth0:1    Link encap:Ethernet  HWaddr 00:00:C5:C2:1B:01
>           inet addr:xx.xx.xx.11  Bcast:xx.xx.xx.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           Interrupt:12 Base address:0xcf00
>
> eth0:2    Link encap:Ethernet  HWaddr 00:00:C5:C2:1B:01
>           inet addr:xx.xx.xx.30  Bcast:xx.xx.xx.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           Interrupt:12 Base address:0xcf00
>
> eth0:3    Link encap:Ethernet  HWaddr 00:00:C5:C2:1B:01
>           inet addr:xx.xx.xx.31  Bcast:xx.xx.xx.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           Interrupt:12 Base address:0xcf00
>
> eth0:4    Link encap:Ethernet  HWaddr 00:00:C5:C2:1B:01
>           inet addr:xx.xx.xx.13  Bcast:xx.xx.xx.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           Interrupt:12 Base address:0xcf00
>
> eth0:5    Link encap:Ethernet  HWaddr 00:00:C5:C2:1B:01
>           inet addr:xx.xx.xx.15  Bcast:xx.xx.xx.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           Interrupt:12 Base address:0xcf00
>
> eth0:6    Link encap:Ethernet  HWaddr 00:00:C5:C2:1B:01
>           inet addr:xx.xx.xx.20  Bcast:xx.xx.xx.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           Interrupt:12 Base address:0xcf00
>
> eth0:7    Link encap:Ethernet  HWaddr 00:00:C5:C2:1B:01
>           inet addr:xx.xx.xx.21  Bcast:xx.xx.xx.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           Interrupt:12 Base address:0xcf00
>
> eth0:8    Link encap:Ethernet  HWaddr 00:00:C5:C2:1B:01
>           inet addr:xx.xx.xx.22  Bcast:xx.xx.xx.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           Interrupt:12 Base address:0xcf00
>
> 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:5744 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:5744 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:591811 (577.9 KiB)  TX bytes:591811 (577.9 KiB)
>
>
> And this, in /var/log/messages
> [root at sunspot ray]# tail /var/log/messages
> Sep  7 06:50:31 sunspot avahi-daemon[2203]: Registering new address
> record for xx.xx.xx.15 on eth0.
> Sep  7 06:50:31 sunspot avahi-daemon[2203]: Registering new address
> record for xx.xx.xx.20 on eth0.
> Sep  7 06:50:31 sunspot avahi-daemon[2203]: Withdrawing address record
> for xx.xx.xx.20 on eth0.
> Sep  7 06:50:31 sunspot avahi-daemon[2203]: Registering new address
> record for xx.xx.xx.20 on eth0.
> Sep  7 06:50:31 sunspot avahi-daemon[2203]: Registering new address
> record for xx.xx.xx.21 on eth0.
> Sep  7 06:50:31 sunspot avahi-daemon[2203]: Withdrawing address record
> for xx.xx.xx.21 on eth0.
> Sep  7 06:50:31 sunspot avahi-daemon[2203]: Registering new address
> record for xx.xx.xx.21 on eth0.
> Sep  7 06:50:33 sunspot avahi-daemon[2203]: Registering new address
> record for xx.xx.xx.22 on eth0.
> Sep  7 06:50:33 sunspot avahi-daemon[2203]: Withdrawing address record
> for xx.xx.xx.22 on eth0.
> Sep  7 06:50:33 sunspot avahi-daemon[2203]: Registering new address
> record for xx.xx.xx.22 on eth0.
>
>
> How can I get my NIC to accept traffic for these IPs?
>
> Thanks In Advance,
> ~Ray
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> CentOS at centos.org
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