We are currently in a scenario where a Server (located on the server side) needs to access the VIP on the client side network. The VIP loadbalances to adjacent LDAP rservers and the regarding server needs to access this loadbalanced service. Is it correct that i need NAT (SNAT) the traffic from the accessing server to a dedicated IP in the client side vlan?
I made quick drawing which hopefully explains my question better.
Your assumption is correct. You need snat for servers to access the vip.
But the nat address can be anything. It does not have to be from the client side. Easiest solution is to use an ip address for the server subnet so that the servers can simply access it with an arp request.
i am not really sure if i understood it correctly regarding the above scenario. Would following config snippet make sure that traffic originating from 192.168.10.0/24 gets translated to 10.20.30.230 when accessing any resource within 10.20.30.0/24?
Is it correct that the nat pool defined in vlan 10 could be anything eg. (nat-pool 69 188.8.131.52 184.108.40.206 netmask 255.255.255.0 pat) as long as that address does not need to be routed?
i think i get it now. Because the NAT'ed IP stays local to the ACE it can be anything and the initial issue is with the returning traffic from the Real Server not flowing back through the ACE but directly being send to the requesting host.
Is that and the according config snippet correct?
access-list NAT-Definition line 10 extended permit tcp 192.168.10.0 255.255.255.0 10.20.30.0 255.255.255.0 ! class-map match-any NAT_CLASS match access-list NAT-Definition ! policy-map multi-match NAT-Policy description NAT-Policy´ class NAT_CLASS nat dynaymic 1 vlan 192 ! interface vlan 192 description Server Side VLAN ip address 192.168.10.254 255.255.255.0 nat-pool 1 172.16.32.1 172.16.32.1 netmask 255.255.255.0 pat service-policy input NAT-Policy no shut
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