verizon router dhcp getting a fixed IP address

I am currently using Verizon DSL to connect to the internet. So, I have

laptop -> router -> internet

A minor irritation with this set up is that the router can potentially assign different IP addresses whenever I do a reboot or something akin to /etc/init.d/networking restart. For example today it can be 192.168.1.58, tomorrow it could be 192.168.1.68 etc.,

I currently have

$ifconfig                                                                                                                             
eth0      Link encap:Ethernet  HWaddr 00:15:c5:19:9c:1a  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:17 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:6790 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6790 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:773105 (754.9 KiB)  TX bytes:773105 (754.9 KiB)

wlan0     Link encap:Ethernet  HWaddr 00:13:02:9e:cc:1b  
          inet addr:192.168.1.21  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::213:2ff:fe9e:cc1b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:7486622 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4833561 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2650697959 (2.4 GiB)  TX bytes:608573891 (580.3 MiB)

To have the same IP address, say 192.168.1.78, every time the computer is booted

1) Add the following lines to /etc/dhcp/dhclient.conf

alias {
  interface "wlan0";
  fixed-address 192.168.1.78;
  option subnet-mask 255.255.255.255;
}

2) restart the network

sudo /etc/init.d/networking restart

Now you should see

$ifconfig                                                                                                                             
eth0      Link encap:Ethernet  HWaddr 00:15:c5:19:9c:1a  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:17 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:6790 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6790 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:773105 (754.9 KiB)  TX bytes:773105 (754.9 KiB)

wlan0     Link encap:Ethernet  HWaddr 00:13:02:9e:cc:1b  
          inet addr:192.168.1.21  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::213:2ff:fe9e:cc1b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:7486678 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4833604 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2650705479 (2.4 GiB)  TX bytes:608589238 (580.3 MiB)

wlan0:0   Link encap:Ethernet  HWaddr 00:13:02:9e:cc:1b  
          inet addr:192.168.1.78  Bcast:0.0.0.0  Mask:255.255.255.255
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

Note the new wlan:0 interface which is always assigned to 192.168.1.78.