Windows 2008 R2 - Question About Loopback Adapter

Hello,
I have the following situation:
I have two Windows Server 2008 R2 Enterprise with Service Pack 1.
I use a load balancer (Radware Alteon) in DSR mode, to load balance traffic for between these servers.
To use DSR, I have to configure a loopback adapter on each of the, with the IP address of the VIP that is configured on the load balancer.
Everything is working ok, the adapter is recognizing the network and traffic is being loadbalanced perfectly.
The issue starts here:
I also configure a health check on the load balancer, so it can check the health of the server, and stop forwarding traffic to a server when it fails.
One of the failure conditions, is when the loopback adapter fails.
When the physical adapter fails, it is easy to recognize, because the health check, on its basic, is sent to the IP address and MAC address of the physical NIC of the server.
When it is not responding, the server is considered as failed.
However, to recognize a failure of the loopback adapter, the health check is being sent to the IP address of the loopback adapter (that is the VIP) and to the MAC address of the physical NIC.
The load balancer is doing that perfectly and the health checks are passed when the loopback is up.
However, when we simulate a loopback failure, by disabling it, the load balancer does not recognize the failure.
Instead, we just see, in the load balancer statistics, that the server response time is very high (more than 3500000 ms) but the server is up.
The check that we use is a simple ICMP ping request, and we are expecting an ICMP reply withing the specified configured period of time (that is, the timeout).
We started a sniffer catpure on the switch connected to the server.
We saw the following behavior:
When the loopback is disabled, the server still replies to the ICMP requests, but with ICMP redirect (redirect for network)
The ICMP redirect message is sent fromt the source IP address and MAC of the physical NIC.
Then, another ICMP request is sent, and here is also a weird behavior:
The request is sent from the source IP address of the load balancer and source MAC of the server, destination IP address of the loopback adapter (that is the VIP) and destination MAC of the load balancer.
It is clear that this ICMP request is from the same "ICMP session" that was just sent, because it is being sent milliseconds after the first request and ICMP redirect reply. It is not a new health check, because a new health check will be sent after
the interval configured (5 seconds after the first ICMP request).
I don't know if this request is being sent from the server, which means that it spoofs a request from the load balancer by using its IP address as the source, or is it a request being sent from the load balancer, which means it spoofs a request from the server
by using its MAC address as the source.
My question is, if anyone saw such behavior of:
1.) ICMP redirect from the server on Windows 2008 R2 when the loopback is disabled.
2.) A seconds request within the same timeframe of the first request, not a part of a second health check.
I configued the loopback adapter properly, with the weakhostsend and weakhostreceive enabled, and with forwarding enabled (using netsh).
I tested the same topology with Windows Server 2003 Enterprise Edition Service Pack 2.
On this OS, when the loopback is disabled, it just not sending an ICMP reply at all.
Thanking in advance, Udi Dahan.

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