[SIPForum-discussion] SBC's that drop traffic based on domain

[Zuñiga, Guillermo]

Did you try defining a Local Policy just for the Legit Domain?




Guillermo Zuniga
Especialista de Soporte Técnico
Gerencia de Soporte Técnico

Tel:    +507 263-6671
Cel:    +507 6670-0481
Fax:    +507 265-3295
Email:  Guillermo.Zuniga at cwpanama.com<mailto:Guillermo.Zuniga at cwpanama.com>
Web:    www.cwpanama.com<http://www.cwpanama.com>

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De: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] En nombre de Chet Curry
Enviado el: jueves, 16 de junio de 2011 03:55 p.m.
Para: discussion at sipforum.org
Asunto: [SIPForum-discussion] SBC's that drop traffic based on domain

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.

Example of hacker Requet URI
Ex. INVITE sip100:199.44.55.22 SIP/2.0

Legit Request URI
Ex. INVITE sip:7724558787 at voip.hacker.net SIP/2.0



I have tried to create an HMR on ACME with little success.  I can get the registers to not respond yet only if sip:199.44.55.22 is use.  If the attacker uses sip:100 at 199.44.55.22 the SBC still will respond with a 403.
Besides that All invites are never dropped.

I have tried to get ACME to come up with a solution yet have been unsuccessful.

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.



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