Working config on Linux -bash-4.1$ ifconfig eth0 Link encap:Ethernet HWaddr 00:01:02:03:3F:69 inet addr:111.222.245.188 Bcast:111.222.245.188 Mask:255.255.255.255 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:8337758 errors:0 dropped:0 overruns:0 frame:0 TX packets:2505096 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:754583206 (719.6 MiB) TX bytes:348167661 (332.0 MiB) eth0:0 Link encap:Ethernet HWaddr 00:01:02:03:3F:69 inet addr:111.222.245.189 Bcast:111.222.245.189 Mask:255.255.255.255 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 eth0:200 Link encap:Ethernet HWaddr 00:01:02:03:3F:69 inet addr:111.222.245.188 Bcast:111.222.245.188 Mask:255.255.255.255 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 eth1 Link encap:Ethernet HWaddr 00:01:02:03:3F:73 inet addr:10.49.0.1 Bcast:10.49.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3099456 errors:0 dropped:0 overruns:0 frame:0 TX packets:1991661 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:396554641 (378.1 MiB) TX bytes:372711959 (355.4 MiB) eth2 Link encap:Ethernet HWaddr 00:01:02:03:3F:7D inet addr:10.49.1.1 Bcast:10.49.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:5711 errors:0 dropped:0 overruns:0 frame:0 TX packets:97904 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:349710 (341.5 KiB) TX bytes:7109613 (6.7 MiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:537 errors:0 dropped:0 overruns:0 frame:0 TX packets:537 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:399475 (390.1 KiB) TX bytes:399475 (390.1 KiB) -bash-4.1$ route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 111.222.235.129 * 255.255.255.255 UH 0 0 0 eth0 10.49.0.0 * 255.255.255.0 U 0 0 0 eth1 10.49.1.0 * 255.255.255.0 U 0 0 0 eth2 10.1.0.0 10.49.0.4 255.255.252.0 UG 0 0 0 eth1 10.31.0.0 10.49.0.4 255.255.252.0 UG 0 0 0 eth1 default * 0.0.0.0 U 0 0 0 eth0 -bash-4.1$ cat /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 TYPE="Ethernet" ONBOOT="yes" USERCTL="no" NM_CONTROLLED="no" BOOTPROTO="static" IPADDR="111.222.245.188" NETMASK="255.255.255.255" GATEWAY="111.222.235.129" SCOPE="peer 111.222.235.129"