How to configure IPv6 tunnel to accept Direct Server Return traffic?

Solution Verified - Updated -

Issue

  • How to configure IPv6 tunnel to accept Direct Server Return traffic?
  • Citrix NetScreen is configured in DSR mode with IP6IP6 tunnel to real server:
 (1) Request from client goes via LB and tunnel
,--------,     ,---------------,              ,--------,
| Client |---->| Load Balancer |=== tunnel ==>| Server |
'--------'     '---------------'              '--------'
  ^                                                   |
  |                                                   |
   \-------------------------------------------------/
 (2) Reply from server is routed directly to client

Environment

  • Red Hat Enterprise Linux
  • IPv6 tunnel
  • Citrix NetScreen or other load balancer or firewall in DSR (Direct Server Return) mode

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