To enable wake on lan (WOL) magic packets with an O2 wireless router you need to change the routing table entry from dynamic to static, this means the entry is always present so the router recognises the IP even when the target machine is switched off. This is true for pretty much all consumer DSL routers.
Login using SuperUser and password printed on the O2 router
telnet 192.168.1.254 Trying 192.168.1.254... Connected to o2wirelessbox.lan. Escape character is '^]'. Username : SuperUser Password : < password from label on router >
Now use the IP tool to delete and re-add the routing table entry
{SuperUser}=>ip
{SuperUser}[ip]=>arplist
{SuperUser}[ip]=>:ip arplist
Interface IP-address HW-address Type
2 LocalNetwork 192.168.1.51 12:34:56:78:9a:bc DYNAMIC < this is one we want to make static
2 LocalNetwork 192.168.1.60 12:34:56:78:9a:bd DYNAMIC
Now physically disconnect the machine you wish to make static, otherwise it will keep getting added as dynamic.
{SuperUser}[ip]=>arpdelete
intf = LocalNetwork
ip = 192.168.1.51
[hwaddr] = 12:34:56:78:9a:bc
:ip arpdelete intf=LocalNetwork ip=192.168.1.51 hwaddr=12:34:56:78:9a:bc
{SuperUser}[ip]=>arplist
Interface IP-address HW-address Type
2 LocalNetwork 192.168.1.60 12:34:56:78:9a:bd DYNAMIC
Now add again using same details
{SuperUser}[ip]=>arpadd
intf = LocalNetwork
ip = 192.168.1.51
[hwaddr] = 12:34:56:78:9a:bc
:ip arpadd intf=LocalNetwork ip=192.168.1.51 hwaddr=12:34:56:78:9a:bc
{SuperUser}[ip]=>arplist
Interface IP-address HW-address Type
2 LocalNetwork 192.168.1.51 12:34:56:78:9a:bc STATIC < now static 
2 LocalNetwork 192.168.1.60 12:34:56:78:9a:bd DYNAMIC
