[lvs-users] Struggling for a long time on this

[XUFENG]

Hi Don Steiny,
Try to use the tool "tcpdump" on your linux boxes(both the lvs director and the real server) to catch and analysize the packets that are seen by your lvs director and your real server.
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XUFENG
2009-05-21

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发件人：Don Steiny
发送日期：2009-05-21 13:45:53
收件人：LinuxVirtualServer.org users mailing list.
抄送：
主题：[lvs-users] Struggling for a long time on this

Hi,

    There are countless "how tos" on setting up LVS and I have tried all 
of them with no success.  Here's my situation. The boxes live in a data 
center.  I have a Linux box with Debian 2.6.26.  It has two ports, eth0 
and eth1.  The two cards talk to two networks, one starting with 66. and 
going to the outside and the other 172. and going to the inside.  Here 
is the result of ifconfig:

eth0      Link encap:Ethernet  HWaddr 00:30:48:d2:1d:52
          inet addr:66.135.63.60  Bcast:66.135.63.127  Mask:255.255.255.128
          inet6 addr: fe80::230:48ff:fed2:1d52/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:12324 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9740 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:10
          RX bytes:1163587 (1.1 MiB)  TX bytes:991344 (968.1 KiB)
          Memory:d8000000-d8020000

eth1      Link encap:Ethernet  HWaddr 00:30:48:d2:1d:53
          inet addr:172.20.4.37  Bcast:172.20.4.63  Mask:255.255.255.224
          inet6 addr: fe80::230:48ff:fed2:1d53/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:42 errors:0 dropped:0 overruns:0 frame:0
          TX packets:94 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:7241 (7.0 KiB)  TX bytes:15327 (14.9 KiB)
          Memory:d8200000-d8220000

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:22 errors:0 dropped:0 overruns:0 frame:0
          TX packets:22 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1190 (1.1 KiB)  TX bytes:1190 (1.1 KiB)

    The documentation talks of a VIP and a RIP and sometimes a DIP.  I 
arranged for there to be MKS telnet on the Windows machine and I can get 
to it through either the internal or external address.  I think that NAT 
will be the simplest and from what I can see, I should be able to enable 
ip_forwarding and then use ipvsadm to create a route from the linux 
machine to the windows machine.  I used these commands:

ipvsadm -A -t 66.135.63.60:telnet -s rr
ipvsadm -a -t 66.135.63.60:telnet -r 172.20.4.38:telnet -m -w 1

and the resulting output of ipvsadm is (60 is server60 and 38 is windows1)

IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  server060.byteadmin.com:teln rr
  -> windows1:telnet              Masq    1      0          0

I can ping and telenet from the linux box (60) to the windows box (38) 
but if I telnet to 60 from a client (my PC at home) it just hangs.  Why 
is it not passing the packets through to the Windows machine?  How can I 
debug this? 

-Don




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