how to run relay with same interfaces?

[ameen.shajahan at wipro.com]

Hi all,
Consider the test setup below.

Server--------------Cisco switch--------------Relay
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Windows PC


For server the interface is eth0
For relay it needs two interfaces so I have two interfaces like eth0 and eth0:1(virtual interface)

ifconfig in server side:
---------------------------
# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:60:43:60:A6:4A
          inet addr:44.44.4.1  Bcast:44.255.255.255  Mask:255.0.0.0
          inet6 addr: 3ffe:501:ffff:117::/64 Scope:Global

ifconfig in relay side
----------------------------
eth0      Link encap:Ethernet  HWaddr 00:60:43:80:41:7E
          inet addr:55.55.5.1  Bcast:55.255.255.255  Mask:255.0.0.0
          inet6 addr: fe80::260:43ff:fe80:417e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:108977 errors:0 dropped:0 overruns:0 frame:0
          TX packets:44065 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:256
          RX bytes:80418517 (76.6 MiB)  TX bytes:3267555 (3.1 MiB)

eth0:1    Link encap:Ethernet  HWaddr 00:60:43:80:41:7E
          inet addr:44.44.4.10  Bcast:44.255.255.255  Mask:255.0.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

Server running fine and waiting for packets.
But while running relay it throw error below.

./dhcrelay -4 -d -i eth0:1 -I eth0 44.44.4.1
Internet Systems Consortium DHCP Relay Agent 4.2.3
Copyright 2004-2011 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Bind socket to interface: No such device


I would like to know whether ISC code allow to run relay with same interfaces????
Eventhough I created two interfaces like eth0 ans eth0:1(virtual interfaces),its throwing error.
Please let me know.


Ameen




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