环境：    director：192.168.232.18:80(centos7)    realserver1：192.168.232.30:80(centos7)    realserver2：192.168.232.31:80(centos7)    client：192.168.232.101        VIP：192.168.232.20:80director配置[root@director~]# echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf [root@director~]# ifconfig eth0:2 192.168.232.21/24 up[root@director~]# vim /etc/sysconfig/ipvsadm -A -t 192.168.232.20:80 -s wrr-a -t 192.168.232.20:80 -r 192.168.232.30:80 -i -w 2-a -t 192.168.232.20:80 -r 192.168.232.31:80 -i -w 2[root@director~]# /etc/init.d/ipvsadm restart[root@director~]# ipvsadm -L -nIP Virtual Server version 1.2.1 (size=4096)Prot LocalAddress:Port Scheduler Flags  -> RemoteAddress:Port           Forward Weight ActiveConn InActConnTCP  192.168.232.20:80 wrr  -> 192.168.232.30:80            Tunnel  2      0          0           -> 192.168.232.31:80            Tunnel  2      0          0  realserver配置(两台所做配置相同)[root@realserver1~]# modprobe ipip[root@realserver1~]# lsmod | grep ipipipip                   13472  0 tunnel4                13252  1 ipipip_tunnel              23760  1 ipip[root@realserver1~]# vim /etc/sysconfig/network-scripts/ifcfg-tunl0DEVICE=tunl0IPADDR=192.168.232.20NETMASK=255.255.255.255ONBOOT=yesNAME=tunl0[root@realserver1~]# systemctl restart network.service[root@realserver1~]# vim /etc/sysctl.confnet.ipv4.ip_forward = 0net.ipv4.conf.tunl0.arp_ignore = 1net.ipv4.conf.tunl0.arp_announce = 2net.ipv4.conf.all.arp_ignore = 1net.ipv4.conf.all.arp_announce = 2net.ipv4.conf.tunl0.rp_filter = 0net.ipv4.conf.all.rp_filter = 0[root@realserver1~]# sysctl -p