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 > > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos 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? -- Sent from the Delta quadrant using Borg technology! Nux! www.nux.ro