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* ipn/ipnlocal: warn incompatibility between no-snat-routes and exitnode This commit adds a warning to health check when the --snat-subnet-routes=false flag for subnet router is set alone side --advertise-exit-node=true. These two would conflict with each other and result internet-bound traffic from peers using this exit node no masqueraded to the node's source IP and fail to route return packets back. The described combination is not valid until we figure out a way to separate exitnode masquerade rule and skip it for subnet routes. Updates #18725 Signed-off-by: KevinLiang10 <37811973+KevinLiang10@users.noreply.github.com> * use date instead of for now to clarify effectivness Signed-off-by: KevinLiang10 <37811973+KevinLiang10@users.noreply.github.com> --------- Signed-off-by: KevinLiang10 <37811973+KevinLiang10@users.noreply.github.com>