You can setup a port-forward using iptables, for example:
*nat
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
Redirect syslog to port above 1024
-A PREROUTING -p udp -m udp --dport 514 -j REDIRECT --to-ports 5514
COMMIT
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:FIREWALL - [0:0]
-A INPUT -j FIREWALL
-A FORWARD -j FIREWALL
-A FIREWALL -i lo -j ACCEPT
Allow return traffic
-A FIREWALL -m state --state ESTABLISHED,RELATED -j ACCEPT
Allow redirected syslog messages
-A FIREWALL -p udp -m udp --dport 5514 -j ACCEPT
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