You need to change the ILO IP on an HP blade. You don’t have access to blade except via SSH to the HP C7000 Chassis.
Here is how:
1. Connect to the C7000 chassis:
HP BladeSystem Onboard Administrator
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Type ‘HELP’ to display a list of valid commands.
Type ‘HELP 
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2.  Connect to the blade via the C7000 chassis CLI:
c7000-1> connect server 8
Connecting to bay 8 …
User:OAtmp-administrator logged-in to c7000-1(10.10.10.101)
iLO 2 Standard Blade Edition 1.80 at 10:12:14 Oct 30 2009
Server Name: host is unamed
Server Power: On
>hpiLO->
3. Show the existing IP and Gateway:
    >hpiLO-> show /map1/enetport1/lanendpt1/ipendpt1
    status=0
    status_tag=COMMAND COMPLETED
    /map1/enetport1/lanendpt1/ipendpt1
      Targets
      Properties
        IPv4Address=10.81.0.160
        SubnetMask=255.255.255.0
        AddressOrigin=Static
      Verbs
        cd version exit show set
    >hpiLO->show gateway1
    status=0
    status_tag=COMMAND COMPLETED
    /map1/gateway1
      Targets
      Properties
        AccessInfo=10.150.240.1
        AccessContext=Default Gateway
      Verbs
        cd version exit show set
4.  Change the IP (requires reboot):
>hpiLO->set /map1/enetport1/lanendpt1/ipendpt1 IPv4Address=10.13.247.222 SubnetMask=255.255.240.0
status=0
status_tag=COMMAND COMPLETED
Network settings change applied, iLO needs to be reset.
CLI session stopped
Connection terminated by server.
5.  After the reboot, follow steps 1-3, and now change the Gateway (requires reboot):
>hpiLO->set /map1/gateway1 AccessInfo=10.13.240.1
status=0
status_tag=COMMAND COMPLETED
Network settings change applied, iLO needs to be reset.
CLI session stopped