My client will be changing Internet provider so I need to change the server's 
ip. The weird thing is, the netmask the telco provide is 255.255.255.255 and 
also provide a gateway. I doubt that 255.255.255.255 will work but its the one 
provided so I give it a try. So I configure firewall and create a virtual ip 
ifcfg-eth0:2 and put the ff:

DEVICE=eth0:2
ONBOOT=yes
BOOTPROTO=static
IPADDR=310.4.20.224    
GATEWAY=310.4.20.1
NETMASK=255.255.255.255

When I restart the network, it says "SIOCADDRT: Network is unreachable". See 
below:

Shutting down interface eth0:                              [  OK  ]
Shutting down loopback interface:                          [  OK  ]
SIOCADDRT: Network is unreachable
Setting network parameters:                                [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:                                [  OK  ]
SIOCADDRT: Network is unreachable
SIOCADDRT: Network is unreachable

I also change NETMASK to 255.255.255.0 but error still appears. Please note 
that I can ping 310.4.20.1. I have Google that 255.255.255.255 is not usable 
except as loopback. 

What might cause the problem? Is it the subnet or the config in the ifcfg? 





      
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