關於在一張網卡新增多個ip - Linux

http://linux.vbird.org/linux_server/0140networkcommand.php
參考鳥哥這頁的說明。

基本上大概有兩個方法：
ifconfig eth0:0 192.168.50.50 broadcast 192.168.50.255
ip address add 192.168.50.50/24 broadcast 192.168.50.255 dev eth0 label eth0:0

但是最近在使用某軟體發現，他會在同個interface上bind多個ip，
大概就像這樣加的結果：

ip address add 192.168.50.50/24 broadcast 192.168.50.255 dev eth0
ip address add 192.168.50.51/24 broadcast 192.168.50.255 dev eth0
ip address add 192.168.51.50/24 broadcast 192.168.51.255 dev eth0

就會變成這樣：
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc...........
link/ether ..:..:..:..:..:.. brd ff:ff:ff:ff:ff:ff
inet 10.1.30.4/24 brd 10.1.30.255 scope global eth0
inet 192.168.50.50/24 brd 192.168.50.255 scope global eth0
inet 192.168.51.50/24 brd 192.168.51.255 scope global eth0
inet 192.168.50.51/24 brd 192.168.50.255 scope global secondary eth0

也就是說不使用label參數，就不會建出eth0:0, eth0:1 ...
而ifconfig也看不到這些inet
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.1.30.4 netmask 255.255.255.0 broadcast 10.1.30.255
inet6 .... prefixlen 64 scopeid 0x20<link>
...

我主要的問題是在，這麼做有沒有甚麼差別，或是有沒有甚麼優劣呢？

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