alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Dyndns Client IP Check"; flow:established,to_server; content:"User-Agent|3a| DynDNS?-Client"; http_header; content:" checkip.dyndns."; http_header; classtype:not-suspicious; sid:2014091; rev:2; metadata:created_at 2012_01_03, updated_at 2012_01_03;)

Added 2017-08-07 21:07:25 UTC

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET POLICY Dyndns Client IP Check"; flow:established,to_server; content:"User-Agent|3a| DynDNS?-Client"; http_header; content:" checkip.dyndns."; http_header; classtype:not-suspicious; sid:2014091; rev:1;)

Added 2012-01-03 16:39:19 UTC