Hi JothirLatha, Clearly it's possible to do this: 4500_3#conf t Enter configuration commands, one per line. End with CNTL/Z. 4500_3(config)#int lo1 4500_3(config-if)#no ip addr 4500_3(config-if)#ip addr 10.1.1.0 255.255.255.255 4500_3(config-if)#int lo2 4500_3(config-if)#ip addr 10.1.1.255 255.255.255.255 4500_3(config-if)#^Z Given that this is the group for network operators, why didn't you just try it? -David Barak "Quis custodes ipsos custodiet?" - Juvenal Date: Mon, 1 Jul 2002 07:53:32 -0700 (PDT) From: JothirLatha Jaganathan <jyothi_j@yahoo.com> To: nanog@merit.edu Subject: Valid ip address ? Can any one tell me if the last byte of a point to point or loopback ipaddress with 32 bit mask can be 0 or 255? For e.g.: Is 10.1.1.0/32 a valid interace address? __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com