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Hello Everyone,
I have so far been able to configure LVS-DR and LVS-NAT and trying to
complete the trilogy. Here is the setup I am using:
2 realservers, 1 director and 1 client
*Director interfaces and other info*:
$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:0c:29:07:96:cf
inet addr:192.168.25.135 Bcast:192.168.25.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe07:96cf/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3571 errors:0 dropped:0 overruns:0 frame:0
TX packets:2861 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1776401 (1.7 MB) TX bytes:292263 (292.2 KB)
Interrupt:19 Base address:0x2000
eth0:110 Link encap:Ethernet HWaddr 00:0c:29:07:96:cf
inet addr:192.168.25.110 Bcast:192.168.25.110
Mask:255.255.255.255
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:19 Base address:0x2000
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)
$ sudo /sbin/ipvsadm -l -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.25.110:8080 rr
-> 192.168.25.131:8080 Tunnel 1 0 1
-> 192.168.25.140:8080 Tunnel 1 0 0
$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
0.0.0.0 192.168.25.2 0.0.0.0 UG 0 0 0 eth0
192.168.25.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0
192.168.25.110 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
*One of the servers*
$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:0c:29:ae:54:3c
inet addr:192.168.25.140 Bcast:192.168.25.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:feae:543c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2892 errors:0 dropped:0 overruns:0 frame:0
TX packets:1892 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1628504 (1.6 MB) TX bytes:184065 (184.0 KB)
Interrupt:19 Base address:0x2024
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:192.168.25.110 Mask:255.255.255.255
UP RUNNING NOARP MTU:1480 Metric:1
RX packets:36 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:2160 (2.1 KB) TX bytes:0 (0.0 B)
$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
0.0.0.0 192.168.25.2 0.0.0.0 UG 0 0 0 eth0
192.168.25.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0
192.168.25.110 0.0.0.0 255.255.255.255 UH 0 0 0
tunl0
I use arptables to solve the ARP problem. I have confirmed using wireshark
traces that only the director sends ARP replies for the VIP. I start
servers on the client using the following command:
$while true ; do nc -l 8080 < index.html ; done
>From the client I execute:
$ lynx -dump http://192.168.25.140:8080/
This is fake WWW server 1
$ lynx -dump http://192.168.25.131:8080/
This is fake WWW server 2
$ lynx -dump http://192.168.25.110:8080/
Looking up 192.168.25.110:8080
Making HTTP connection to 192.168.25.110:8080
Alert!: Unable to connect to remote host.
lynx: Can't access startfile http://192.168.25.110:8080/
So, I ran a wireshark trace on tunl0 on one of the realservers. I see a
bunch of TCP SYNs with scr IP 192.168.25.128 and dst IP 192.168.25.110 but
the server never sends back a SYN ACK. I have been trying to search online
to find a solution for this but no luck so far. Can someone please tell me
what I might be missing?
Thanks,
Dushyant
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