How to separate arriving syslog messages

Logstash instance is listening on a single port.

I tried to separate incoming syslog messages as follows:
Two ways with "IN" and "==" operator but logstash doesn't catch one of the IFs.

input {
    syslog {
        port => 5040

output {
    if "10.1.x.x" in [host] {
        pipeline { send_to => "subpipeline-02" }

    else if "host" == "10.1.x.y" {
        pipeline { send_to => "subpipeline-01" }

    else {
        pipeline { send_to => fallback }

Warning in logstash-plain.log

[2019-11-04T11:49:43,681][WARN ][org.logstash.plugins.pipeline.PipelineBus] Attempted to send event to 'fallback' but that address was unavailable. Maybe the destination pipeline is down or stopping? Will Retry.

Has anybody an idea how to solve this issue?


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