[OpenSIPS-Users] How to protect OpenSIPS from undesidered requests (DoS attack?)

[Nick Altmann]

        if ($ua =~ "friendly-scanner") {
                xlog("L_ERR", "Attack attempt - Request dropped");
                drop();
        }

--
Nick

2013/3/6 leo <uzcudunl at yahoo.it>

> Hello:
>
> I'm receiving on my OpenSIPS server a lot of register request. I believe
> that is someone trying to attack the sip service because the source IP is
> not one that i know. Here is the request:
>
> 10:03:54.191249 00:08:e3:20:fb:b6 > 00:0c:29:fc:95:e1, ethertype IPv4
> (0x0800), length 384: (tos 0x0, ttl 52, id 0, offset 0, flags [DF], proto
> UDP (17), length 370)
>     199.217.115.214.5981 > X.X.X.X.5060: [udp sum ok] SIP, length: 342
>         REGISTER sip:X.X.X.X SIP/2.0
>         Via: SIP/2.0/UDP 199.217.115.214:5981
> ;branch=z9hG4bK-2684304106;rport
>         Content-Length: 0
>         From: "5988" <sip:5988 at X.X.X.X>
>         Accept: application/sdp
>         User-Agent: friendly-scanner
>         To: "5988" <sip:5988 at X.X.X.X>
>         Contact: sip:123 at 1.1.1.1
>         CSeq: 1 REGISTER
>         Call-ID: 3943182463
>         Max-Forwards: 70
>
> How could i prevent this kind of requests?
> Thanks a lot.
>
> Leo.
>
>
>
> --
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>
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