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Hi List,
I am new to LVS and as expected I am having a bit of problems with the
setup.
I am trying to setup a simple one network LVS NAT, at first one Load
balancer and two real servers running IIS 6, my setup consists of the
following:
Load balancer: Fedora Core 6 with ipvsadm v1.24 and IP forwarding enabled.
Real Servers: 2x windows 2003 running IIS6 that can be pinged and access
from the LB
The LB has two Ethernets (planning on getting it to work on two
Ethernets on two different networks later) I am using only one with the
following configuration:
eth1 Link encap:Ethernet HWaddr 00:0C:29:2F:81:F7
inet addr:172.16.5.126 Bcast:172.16.5.255 Mask:255.255.255.0
eth1:0 Link encap:Ethernet HWaddr 00:0C:29:2F:81:F7
inet addr:172.16.5.131 Bcast:172.16.5.255 Mask:255.255.255.0
I'm using eth1:0 and that IP is the default gateway on the two web servers.
the configuration with ipvsadm is:
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 172.16.5.131:http wlc
-> RS2:http Masq 1 0 0
-> RS1:http Masq 1 0 0
where RS1 = 172.16.5.48, and RS2 = 172.16.5.215
when I try and access the VIP of the LB I get the following (using tcpdump):
16:39:24.754213 IP 172.16.5.17.28654 > 172.16.5.131.http: S
3384466648:3384466648(0) win 65535 <mss 1260,nop,nop,sackOK>
16:39:24.754366 IP 172.16.5.17.28654 > 172.16.5.48.http: S
3384466648:3384466648(0) win 65535 <mss 1260,nop,nop,sackOK>
16:39:24.758253 IP 172.16.5.48.http > 172.16.5.17.28654: S
3834528569:3834528569(0) ack 3384466649 win 16384 <mss 1460,nop,nop,sackOK>
16:39:26.363340 IP 172.16.5.48.http > 172.16.5.17.28654: S
3834528569:3834528569(0) ack 3384466649 win 16384 <mss 1460,nop,nop,sackOK>
16:39:26.676958 IP 172.16.5.17.28654 > 172.16.5.131.http: S
3384466648:3384466648(0) win 65535 <mss 1260,nop,nop,sackOK>
16:39:26.677004 IP 172.16.5.17.28654 > 172.16.5.48.http: S
3384466648:3384466648(0) win 65535 <mss 1260,nop,nop,sackOK>
16:39:31.249205 IP 172.16.5.48.http > 172.16.5.17.28654: S
3834528569:3834528569(0) ack 3384466649 win 16384 <mss 1460,nop,nop,sackOK>
16:39:31.321221 IP 172.16.5.17.28654 > 172.16.5.131.http: S
3384466648:3384466648(0) win 65535 <mss 1260,nop,nop,sackOK>
16:39:31.321289 IP 172.16.5.17.28654 > 172.16.5.48.http: S
3384466648:3384466648(0) win 65535 <mss 1260,nop,nop,sackOK>
My IP being 172.16.5.17
Now My understanding is that traffic will go My IP > LB > RS in the
forward path and RS > LB > MY IP in the reply path, but that is not
happening and I dont know why? Its a rather simple setup, most probably
I am doing something wrong or haven't read enough, I hope you can help
me out with this.
Thanks in advance.
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