[f-nsp] LB fails when source-nat is disabled

[Gaurav Sabharwal]

Some time ago, we had to enable source-nat on the LB. Now we are
trying to disable source-nat on the LB. When we disable the source-nat
on the load balancer, the VIP does not responds to the HTTP
connections.

tcpdump on the server confirms that the packets are reaching the
server and are being sent back. However nothing reaches the web
browser.

show version output:

 SW: Version 07.3.05T12 Copyright (c) 1996-2002 Foundry Networks, Inc.
     Compiled on Jul 18 2002 at 17:20:18 labeled as SLB07305
 HW: ServerIron Switch, serial number 157b24
 400 MHz Power PC processor 740 (revision 8) with 32756K bytes of DRAM
   8 100BaseT interfaces with Level 1 Transceiver LXT975
   0  uplink interfaces
 256 KB PRAM and 8*2048 CAM entries for DMA 2, version 0807
 128 KB boot flash memory
4096 KB code flash memory
2048 KB BRAM, BM version 02
 128 KB QRAM
 512 KB SRAM
Octal System, Maximum Code Image Size Supported: 1965568 (0x001dfe00)
The system uptime is 2 days 21 hours 28 minutes 32 seconds
The system : started=warm start   reloaded=by "reload"

The configuration is attached. Any help is highly appreciated.

Thanks,
Gaurav
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