Director

ifconfig eth0:0 172.16.0.1 netmask 255.255.255.255 broadcast 172.16.0.1 up
		

ifconfig eth0:0 <VIP> netmask 255.255.255.255 broadcast <VIP> up

ipvsadm -A -t 172.16.0.1:80 -s wlc
ipvsadm -a -t 172.16.0.1:80 -r 172.16.0.10 -i
ipvsadm -a -t 172.16.0.1:80 -r 172.16.0.20 -i
ipvsadm -a -t 172.16.0.1:80 -r 172.16.0.30 -i
		

ifconfig

[root@centos etc]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:15:2B:CF
          inet addr:172.16.0.40  Bcast:172.16.255.255  Mask:255.255.0.0
          inet6 addr: fe80::20c:29ff:fe15:2bcf/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2340 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2524 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:995068 (971.7 KiB)  TX bytes:327201 (319.5 KiB)
          Interrupt:177 Base address:0x1400

eth0:0    Link encap:Ethernet  HWaddr 00:0C:29:15:2B:CF
          inet addr:172.16.0.1  Bcast:172.16.0.1  Mask:255.255.255.255
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Interrupt:177 Base address:0x1400

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:27 errors:0 dropped:0 overruns:0 frame:0
          TX packets:27 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2460 (2.4 KiB)  TX bytes:2460 (2.4 KiB)

[root@centos etc]#

		

route

[root@centos etc]# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
169.254.0.0     *               255.255.0.0     U     0      0        0 eth0
172.16.0.0      *               255.255.0.0     U     0      0        0 eth0
default         172.16.0.254    0.0.0.0         UG    0      0        0 eth0
[root@centos etc]#

		

ipvsadm

[root@centos etc]# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  172.16.0.1:http wlc
  -> 172.16.0.30:http             Tunnel  1      0          0
  -> 172.16.0.20:http             Tunnel  1      0          0
  -> 172.16.0.10:http             Tunnel  1      0          0
[root@centos etc]#

		

realserver

echo 1 > /proc/sys/net/ipv4/ip_forward
modprobe ipip
ifconfig tunl0 0.0.0.0 up
echo 1 > /proc/sys/net/ipv4/conf/all/hidden
echo 1 > /proc/sys/net/ipv4/conf/tunl0/hidden
ifconfig tunl0 172.16.0.1 netmask 255.255.255.255 broadcast 172.16.0.1 up
route add -host 172.16.0.1 dev tunl0
		

ubuntu real server

neo@backup:~$ sudo sysctl -w net.ipv4.ip_forward=1
net.ipv4.ip_forward = 1
neo@backup:~$ sudo modprobe ipip
neo@backup:~$ sudo ifconfig tunl0 0.0.0.0 up

neo@backup:~$ sudo ifconfig tunl0 172.16.0.1 netmask 255.255.255.255 broadcast 172.16.0.1 up
neo@backup:~$ sudo route add -host 172.16.0.1 dev tunl0
neo@backup:~$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
172.16.0.1      *               255.255.255.255 UH    0      0        0 tunl0
localnet        *               255.255.0.0     U     0      0        0 eth0
default         172.16.0.254    0.0.0.0         UG    0      0        0 eth0
neo@backup:~$

		

script

sudo sysctl -w net.ipv4.ip_forward=1
sudo modprobe ipip
sudo ifconfig tunl0 0.0.0.0 up
sudo ifconfig tunl0 172.16.0.1 netmask 255.255.255.255 broadcast 172.16.0.1 up
		

ifconfig

neo@master:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:CC:CF:A2
          inet addr:172.16.0.10  Bcast:172.16.255.255  Mask:255.255.0.0
          inet6 addr: fe80::20c:29ff:fecc:cfa2/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5006 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4692 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2866792 (2.7 MiB)  TX bytes:639042 (624.0 KiB)
          Interrupt:177 Base address:0x1400

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:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

tunl0     Link encap:IPIP Tunnel  HWaddr
          inet addr:172.16.0.1  Mask:255.255.255.255
          UP RUNNING NOARP  MTU:1480  Metric:1
          RX packets:98 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:19511 (19.0 KiB)  TX bytes:0 (0.0 b)

neo@master:~$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
172.16.0.0      *               255.255.0.0     U     0      0        0 eth0
default         172.16.0.254    0.0.0.0         UG    0      0        0 eth0
neo@master:~$