Interesting FreeBSD rc.conf network option
Posted Mon, 19 Mar 2007
In rc.conf, I can put:
ipv4_addrs_bge0="192.168.0.1-254/24 192.168.5.50-100/24"And do
/etc/rc.d/netif restart bge0
and we get:
% ifconfig bge0
bge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=1b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING>
inet 192.168.0.1 netmask 0xffffff00 broadcast 192.168.0.255
inet6 fe80::20a:e4ff:fe3f:92ee%bge0 prefixlen 64 scopeid 0x1
inet 192.168.0.2 netmask 0xffffffff broadcast 192.168.0.2
inet 192.168.0.3 netmask 0xffffffff broadcast 192.168.0.3
...
inet 192.168.0.253 netmask 0xffffffff broadcast 192.168.0.253
inet 192.168.0.254 netmask 0xffffffff broadcast 192.168.0.254
inet 192.168.5.50 netmask 0xffffff00 broadcast 192.168.5.255
inet 192.168.5.51 netmask 0xffffffff broadcast 192.168.5.51
...
inet 192.168.5.99 netmask 0xffffffff broadcast 192.168.5.99
inet 192.168.5.100 netmask 0xffffffff broadcast 192.168.5.100
ether 00:0a:e4:3f:92:ee
media: Ethernet autoselect (none)
status: no carrier
Neat. That's one way to take an entire subnet.