newbie asks for a bit of advice about netflow and src interface

[snoopy78]

hi at all,

i'm new to opnsense but got my private setup working like this:

opnesense 19.7 on an A2SDI-H + I350 qad nic
LAN (incl. vlan) on the 10G
wan1 (pppoe) on I350 port
wan2 (lte) on I350 port

now i want to use netflow.

my netflow server is 192.168.10.60/24 which is behind an ipsec tunnel.
my opnsense has vlan1 192.168.0.1/24.

since i haven't recieved any data on my prtg i checked by console and saw, that the firewall can't reach the server, since it's using it's wan IP. So i created a outbound nat telling WAN1 target Server use VLAN1 Interface ip, since then i use "ping -S 192.168.0.1 192.168.10.60" i can reach the server via the tunnel.

can you advice me please, where are my thoughts incorrect..

thank you

br
snoopy78