I have a couple of issues with ISP Load Balancing on NGX.  We have a VPN with 
an externally managed gateway and this suffers a partial failure when we enable 
the load balancing, they can connect to us be we cannot connect to them.  I 
have identified that this is down to the automatic NAT rules that are required 
for the ISP LB.
 
We have a NAT rule that allows all the internal networks to travel over the VPN 
without being NAT's (original-original-original) and all other traffic towards 
the internet be NAT'd behind the Gateway Address.  When we apply an Auto NAT on 
the Network Object as per Checkpoints instructions for ISP LB this places 2 
rules at the top of the NAT Rulebase one of which supersede the rule described 
above, therefore the traffic across the VPN is NAT'd behind the gateway address 
to.  This causes the VPN to fail.
 
If anyone has had a similar experience with this or has any ideas I'd 
appreciate the assistance.
 
Thanks
Mark

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