Apache on second ip address?

[Rory Campbell-Lange]

I'm moving our intranet onto a new box with address x.x.x.23 from an old
box with a x.x.x.247 address.

I know very little about networking (I'm afraid everyone is accessing
the intranet via the full ip address rather than name), and I would like
to ask if it is possible to get the new box to run off both .23 and .247
although it only has one NIC. Do I need to set up a Virtual Host in
apache?

I've tried:

ifconfig eth0:1 add x.x.x.247, and this shows up in the routing table
as:

eth0      Link encap:Ethernet  HWaddr 00:03:47:06:D0:95  
          inet addr:x.x.x.23  Bcast:x.x.x.255       
                                                Mask:255.255.255.0
          EtherTalk Phase 2 addr:6/224
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:69790530 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7724204 errors:0 dropped:0 overruns:2942 carrier:0
          collisions:0 

eth0:1    Link encap:Ethernet  HWaddr 00:03:47:06:D0:95  
          inet addr:x.x.x.249  Bcast:x.x.x.255  
                                                Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

In apache (1.3 version) I have set the following directives:

    BindAddress x.x.x.23
    BindAddress x.x.x.249
    
    ServerName  x.x.x.23
    Listen      x.x.x.249
    
Thanks for ANY help!
Rory