Dear all, I am trying to setup LVS-NAT load-balancer. I am using three ubuntu instances. Here are the instance details... Load-balancer Private IP: 192.168.20.44 Public IP: 10.10.10.167 Real Server Private IP: 192.168.16.10 Public IP: 10.10.10.221 Real Server Private IP: 192.168.16.11 Public IP: 10.10.10.225 Now, I have configured ipvsadm in following manner... root@ubuntutcs:~# root@ubuntutcs:~# ipvsadm -A -u 192.168.20.44:4679 -s rr root@ubuntutcs:~# ipvsadm -a -u 192.168.20.44:4679 -r 192.168.16.10:4679 -m root@ubuntutcs:~# ipvsadm -a -u 192.168.20.44:4679 -r 192.168.16.11:4679 -m Set "net.ipv4.ip_forward" to 1 in /etc/sysctl.conf file. Then I have configured iptables for NAT. root@ubuntutcs:~# iptables -t nat -A PREROUTING -p udp --dport 4679 -m ipvs --vproto udp --vaddr 192.168.20.82 --vport 5683 --vmethod MASQ --vportctl 5683 root@ubuntutcs:~# iptables -t nat -A POSTROUTING -j MASQUERADE With this configuration, I am not able to connect real servers. I have used "tcpdump" to track packets. Here are snippet of tcpdump output on load-balancer.. root@ubuntutcs:~# !tcp tcpdump -n -i any port 5683 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on any, link-type LINUX_SLL (Linux cooked), capture size 65535 bytes 14:40:09.113514 IP 10.10.10.226.45048 > 192.168.20.82.5683: UDP, length 39 14:40:09.113685 IP 10.10.10.226.45048 > 192.168.16.10.5683: UDP, length 39 14:40:23.556608 IP 10.10.10.226.47732 > 192.168.20.82.5683: UDP, length 39 14:40:23.556790 IP 10.10.10.226.47732 > 192.168.16.11.5683: UDP, length 39 It seems that packets are forwarded to the real servers, but they are not received by real servers. I have executed "tcpdump" on real servers too, but did not get any packets. Please advice, do I need to configure real server? Thanks, Prasun _______________________________________________ Please read the documentation before posting - it's available at: http://www.linuxvirtualserver.org/
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