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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In an effort to mitigate DDOS attack’s I am trying to deny all traffic based on the request-uri host domain. The reason being from what I see is “most” attacks are sent to the SBC’s IP address and does use the domain name. When the proper domain is supplied I would like to allow that packet. All other I will not respond to period.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Example of hacker Requet URI<o:p></o:p></p><p class=MsoNormal>Ex. <span class=sipmethod><b><span style='font-size:8.5pt;font-family:"Courier New";color:#1E508A'>INVITE</span></b></span><span class=apple-converted-space><span style='font-size:8.5pt;font-family:"Courier New";color:#444444'> </span></span><span class=sipscheme><span style='font-size:8.5pt;font-family:"Courier New";color:gray'>sip100:</span></span><span class=sipruri><b><span style='font-size:8.5pt;font-family:"Courier New";color:#1E508A'>199.44.55.22</span></b></span><span class=apple-converted-space><span style='font-size:8.5pt;font-family:"Courier New";color:#444444'> </span></span><span class=sipversion><span style='font-size:8.5pt;font-family:"Courier New";color:gray'>SIP/2.0<o:p></o:p></span></span></p><p class=MsoNormal><span class=sipversion><span style='font-size:8.5pt;font-family:"Courier New";color:gray'><o:p> </o:p></span></span></p><p class=MsoNormal>Legit Request URI<o:p></o:p></p><p class=MsoNormal>Ex. <span class=sipmethod><b><span style='font-size:8.5pt;font-family:"Courier New";color:#1E508A'>INVITE</span></b></span><span class=apple-converted-space><span style='font-size:8.5pt;font-family:"Courier New";color:#444444'> </span></span><span class=sipscheme><span style='font-size:8.5pt;font-family:"Courier New";color:gray'>sip:7724558787@<span style='background:yellow;mso-highlight:yellow'>voip.</span></span></span><span class=sipruri><b><span style='font-size:8.5pt;font-family:"Courier New";color:#1E508A;background:yellow;mso-highlight:yellow'>myvoice.net</span></b></span><span class=apple-converted-space><span style='font-size:8.5pt;font-family:"Courier New";color:#444444'> </span></span><span class=sipversion><span style='font-size:8.5pt;font-family:"Courier New";color:gray'>SIP/2.0<o:p></o:p></span></span></p><p class=MsoNormal><span class=sipversion><span style='font-size:8.5pt;font-family:"Courier New";color:gray'><o:p> </o:p></span></span></p><p class=MsoNormal><span class=sipversion><span style='font-size:8.5pt;font-family:"Courier New";color:gray'><o:p> </o:p></span></span></p><p class=MsoNormal><span class=sipversion><span style='font-size:8.5pt;font-family:"Courier New";color:gray'><o:p> </o:p></span></span></p><p class=MsoNormal>I have tried to create an HMR on ACME with little success. I can get the registers to not respond yet only if <a href="sip:199.44.55.22">sip:199.44.55.22</a> is use. If the attacker uses <a href="sip:100@199.44.55.22">sip:100@199.44.55.22</a> the SBC still will respond with a 403. <o:p></o:p></p><p class=MsoNormal>Besides that All invites are always responded to regardless even though the HMR(Header Manipulation) should be using Invite and registration meathods.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have tried to get ACME to come up with a solution yet have been unsuccessful. They will not even take my request for a feature enhancement. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Has anyone had any successful experience at implementing this on any other SBC platform? I know there are many ways to protect yourself from DDOS attacks yet to me this is a simple first line of defense.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><img border=0 width=624 height=499 id="Picture_x0020_1" src="cid:image001.png@01CC2C46.97470A90" alt="Description: signature2"><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>