Load the IP Alias module (you can skip this step if you compiled
the module into the kernel): /sbin/insmod /lib/modules/`uname -r`/ipv4/ip_alias.o |
Setup the loopback, eth0, and all the IP addresses beginning with the
main IP address for the eth0 interface: /sbin/ifconfig lo 127.0.0.1
/sbin/ifconfig eth0 up
/sbin/ifconfig eth0 172.16.3.1
/sbin/ifconfig eth0:0 172.16.3.10
/sbin/ifconfig eth0:1 172.16.3.100 |
172.16.3.1 is the main IP address, while .10 and .100 are the aliases. The
magic is the eth0:x where x=0,1,2,...n for the different IP addresses. The
main IP address does not need to be aliased. Setup the routes. First route the loopback, then the net, and
finally, the various IP addresses starting with the default (originally
allocated) one: /sbin/route add -net 127.0.0.0
/sbin/route add -net 172.16.3.0 dev eth0
/sbin/route add -host 172.16.3.1 dev eth0
/sbin/route add -host 172.16.3.10 dev eth0:0
/sbin/route add -host 172.16.3.100 dev eth0:1
/sbin/route add default gw 172.16.3.200 |
That's it.
In the example IP address above, I am using the Private IP addresses (RFC 1918) for
illustrative purposes. Substitute them with your own official or private IP
addresses. The example shows only 3 IP addresses. The max is defined to be 256 in
/usr/include/linux/net_alias.h. 256 IP addresses on ONE card is a lot :-)! Here's what my /sbin/ifconfig looks like: lo Link encap:Local Loopback
inet addr:127.0.0.1 Bcast:127.255.255.255 Mask:255.0.0.0
UP BROADCAST LOOPBACK RUNNING MTU:3584 Metric:1
RX packets:5088 errors:0 dropped:0 overruns:0
TX packets:5088 errors:0 dropped:0 overruns:0
eth0 Link encap:10Mbps Ethernet HWaddr 00:8E:B8:83:19:20
inet addr:172.16.3.1 Bcast:172.16.3.255 Mask:255.255.255.0
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:334036 errors:0 dropped:0 overruns:0
TX packets:11605 errors:0 dropped:0 overruns:0
Interrupt:7 Base address:0x378
eth0:0 Link encap:10Mbps Ethernet HWaddr 00:8E:B8:83:19:20
inet addr:172.16.3.10 Bcast:172.16.3.255 Mask:255.255.255.0
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0
TX packets:0 errors:0 dropped:0 overruns:0
eth0:1 Link encap:10Mbps Ethernet HWaddr 00:8E:B8:83:19:20
inet addr:172.16.3.100 Bcast:172.16.3.255 Mask:255.255.255.0
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:1 errors:0 dropped:0 overruns:0
TX packets:0 errors:0 dropped:0 overruns:0 |
And /proc/net/aliases: device family address
eth0:0 2 172.16.3.10
eth0:1 2 172.16.3.100 |
And /proc/net/alias_types: type name n_attach
2 ip 2 |
Of course, the stuff in /proc/net was created by the ifconfig command and
not by hand! | |
| |
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