On 02.08.2012 15:00, Birta Levente wrote:
Hi all
Can someone explain me this:
ifcfg-eth0-range1: ONBOOT="yes" IPADDR_START="192.168.1.48" IPADDR_END="192.168.1.55" CLONENUM_START="1"
Why Bcast is 192.168.1.51 and why Mask is 255.255.255.252 ?
OS: Centos 6.3/64bit
Thanks
Levi
# ifconfig
eth0:1 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.48 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee0000-fbf00000
eth0:2 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.49 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee0000-fbf00000
eth0:3 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.50 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee0000-fbf00000
eth0:4 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.51 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee0000-fbf00000
eth0:5 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.52 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee0000-fbf00000
eth0:6 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.53 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee0000-fbf00000
eth0:7 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.54 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee0000-fbf00000
eth0:8 Link encap:Ethernet HWaddr 00:9C:02:99:FA:00 inet addr:192.168.1.55 Bcast:192.168.1.51 Mask:255.255.255.252 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:16 Memory:fbee0000-fbf00000
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You can (and are encouraged) to specify the NETMASK as well in that range file. I don't know why it uses that mask and broadcast; maybe it inherits them from other already configures interface?