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Thanks for your help, Julian.
I followed your instruction. But it still did not work. Here is what I
did (VIP=x.y.z.180, RIP=x.y.z.230) on the real server:
$ifconfig tunl0 up
$ifconfig dummy0 0.0.0.0 up
$echo 1 > /proc/sys/net/ipv4/conf/all/hidden
$echo 1 > /proc/sys/net/ipv4/conf/dummy0/hidden
$ip addr add x.y.z.180 dev dummy0
But I still cannot ping the real server (with RIP=x.y.z.230) from
director (with VIP=x.y.z.180). Of course, RIP and VIP are on the same
subnet (mask 255.255.255.128).
What shows from "tcpdump -ln arp" on host x.y.z.230:
15:28:43.945249 eth0 < arp who-has x.y.z.230 tell x.y.z.180
15:28:44.945246 eth0 < arp who-has x.y.z.230 tell x.y.z.180
15:28:45.945246 eth0 < arp who-has x.y.z.230 tell x.y.z.180
15:28:46.945248 eth0 B arp who-has x.y.z.230 tell x.y.z.180
15:28:47.945247 eth0 B arp who-has x.y.z.230 tell x.y.z.180
...
arp -an | grep 230 on the redirector (x.y.z.180) gives me:
? (x.y.z.230) at <incomplete> on eth0
ifconfig on the real server:
dummy0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet addr:x.y.z.180 Bcast:0.0.0.0 Mask:255.255.255.255
UP BROADCAST RUNNING NOARP MTU:1500 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
eth0 Link encap:Ethernet HWaddr 00:01:03:BB:D4:38
inet addr:x.y.z.230 Bcast:x.y.z.255 Mask:255.255.255.128
UP BROADCAST RUNNING MTU:1500 Metric:1
RX packets:4441 errors:0 dropped:0 overruns:78 frame:0
TX packets:2014 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
Interrupt:11 Base address:0xdc00
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:14 errors:0 dropped:0 overruns:0 frame:0
TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
tunl0 Link encap:IPIP Tunnel HWaddr
UP RUNNING NOARP MTU:1480 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
$route on the real server:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
x.y.z.128 * 255.255.255.128 U 0 0 0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default x.y.z.129 0.0.0.0 UG 0 0 0 eth0
$route on the director has exactly the same output as above.
When I ping x.y.z.230 at the redirector I got:
Destination Host Unreachable.
I'm a little bit frustrated here. Any help would be greatly appreciated.
-Tao
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