yesterday I wrote:
Dave> /sbin/arp -i eth0:1 -s 207.168.228.79 00:10:F3:01:11:24 netmask 255.255.255.192
pub
to which Bernd Eckenfels responded:
Bernd> What do u try to do with that?
When host A goes down, I want host B to steal it's IP address. This
is for automatic fail-over of a service that both host A and host B
can provide.
Bernd> But why do u need it, anyway?
The router through which the clients access my service will continue
to send packets to host A even after host A hangs. I want host B to
be able to convince the router to start sending packets destined to
A's IP address to host B.
Bernd> Is the above MAC Address not the Address of your NIC?
It is host B's MAC address, so yes, it is the address of the NIC which
will be sending the arp packet.
Bernd> Alias Devices cant respond to arp, just use "-i eth0".
That doesn't work either! Check this out:
[root@host225 /root]# /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:10:F3:01:11:1F
inet addr:207.168.228.80 Bcast:207.168.228.127 Mask:255.255.255.192
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:49351 errors:0 dropped:0 overruns:0 frame:0
TX packets:21914 errors:0 dropped:0 overruns:0 carrier:4
collisions:15067 txqueuelen:100
Interrupt:11 Base address:0xe000
eth0:1 Link encap:Ethernet HWaddr 00:10:F3:01:11:1F
inet addr:207.168.228.79 Bcast:207.168.228.127 Mask:255.255.255.192
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:11 Base address:0xe000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:3924 Metric:1
RX packets:43314 errors:0 dropped:0 overruns:0 frame:0
TX packets:43314 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
[root@host225 /root]# /sbin/arp -i eth0 -s 207.168.228.80 00:10:F3:01:11:1F netmask
255.255.255.192 pub
SIOCSARP: Invalid argument
[root@host225 /root]#
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