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Can i send syslogdata trough a ipsectunnel with pfsense in both ends?
Sure, just follow the suggestion on this page:
http://doc.pfsense.org/index.php/Why_can%27t_I_query_SNMP,_use_syslog,_NTP,_or_other_services_initiated_by_the_firewall_itself_over_IPsec_VPN%3F