Try to setup an rsyslog server on an ubuntu server. Than see if that receive syslog data from your router data.
For me Kiwi is just an equivalent to rsyslog server.
What other write about Splunk/Kiwi
The SolarWinds Kiwi Syslog Server does what it’s supposed to do. It’s a bare-bones Syslog Server. If your company is just trying to fulfill security requirements or doesn’t need all the advanced features of a product such as Splunk, then Kiwi will work well and not break the bank. Using the tool is very straightforward as there aren’t a lot of options outside of just viewing logs.