Server answers only on one IP. Why?

ifconfig -a

eth0      Link encap:Ethernet  HWaddr 00:25:90:60:1B:FC  
          inet addr:10.0.47.42  Bcast:10.255.255.255  Mask:255.255.255.248
          inet6 addr: fe80::225:90ff:fe60:1bfc/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4300 errors:0 dropped:0 overruns:0 frame:0
          TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:416886 (407.1 KiB)  TX bytes:812 (812.0 b)
          Memory:fbce0000-fbd00000 

eth1      Link encap:Ethernet  HWaddr 00:25:90:60:1B:FD  
          inet addr:72.9.239.194  Bcast:72.255.255.255  Mask:255.255.255.248
          inet6 addr: fe80::225:90ff:fe60:1bfd/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:82334 errors:0 dropped:0 overruns:0 frame:0
          TX packets:53868 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:85116034 (81.1 MiB)  TX bytes:22357038 (21.3 MiB)
          Memory:fbde0000-fbe00000 

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:5356 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5356 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:674981 (659.1 KiB)  TX bytes:674981 (659.1 KiB)

Adresses assigned to server should be 5 usable:

72.9.239.194
72.9.239.195
72.9.239.196
72.9.239.197
72.9.239.198

Unfortunately when I do ping server answers only on: 72.9.239.194

OS=centOS 6/64bit

What could be wrong ?

You need to configure those IPs on that interface.

ip addr add 72.9.239.195/29 dev eth1
ip addr add 72.9.239.196/29 dev eth1
ip addr add 72.9.239.197/29 dev eth1
ip addr add 72.9.239.198/29 dev eth1

You can also use the ifcfg-eth1:n files in /etc/sysconfig/network-scripts to make this configuration last across reboots.

See Red Hat's documentation for more information.

From that output.. you only have 1 IP on the interface. You have been assigned that block but you have to alias the other IPs to that interface.

You can see if you have them aliased via

ip address show

quick and old way is using ifconfig to add aliases

ifconfig eth1:1 72.9.239.195 netmask 255.255.255.0

Same command for the other IPs.

Server answers only on one IP. Why?

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