On May 11, 2012, at 4:08 PM, Chuck Swiger wrote:
> On May 11, 2012, at 2:09 PM, Chad Leigh Shire.Net LLC wrote:
>> it is my understanding that SYN_SENT is when MY SIDE sends out a request and
>> is awaiting a reply?
>
> That's right.
>
>> One of the jails we run for a customer had hundreds (if not thousands) of
>> attempts to connect from the 147. address you see below. It was exhausting
>> resources so that new tcp connections could not be made until some closed.
>
> You have/had your jail opening connections to the webserver at IP
> 147.237.76.155, not that IP trying to connect to you.
>
>> I added that address to a "pf" block statement to stop it but now we get a
>> rolling connections in a "netstat -a" as show below (host. being a generic
>> name used in place of actual host on our side). I am wondering if this
>> shows something on our side trying to connect out? That is what it appears
>> to me to be, which does not make sense.
>>
>>
>> tcp4 0 0 host.52562 147.237.76.155.http SYN_SENT
>> tcp4 0 0 host.52561 147.237.76.155.http SYN_SENT
>
> Yes, your side is trying to connect out.
> Unless you know better, it seems reasonable to gather that it's doing a DoS
> attack against:
Hi Chuck!
Thanks. I am investigating as this side should not be going out at all, but
the SYN_SENT made me think it was.
Thanks
Chad
>
> % whois 147.237.76.155
> [ ... ]
> inetnum: 147.237.0.0 - 147.237.255.255
> netname: IL-GOVT-NET
> descr: Israeli Government Network
> country: IL
> admin-c: AT979-RIPE
> tech-c: TT441-RIPE
> status: ASSIGNED PI
> mnt-by: GOV-IL-DNS
> mnt-lower: GOV-IL-DNS
> mnt-routes: AS8867-MNT { ANY }
> mnt-routes: AS9116-MNT { 147.237.232.0/24^24-24 }
> source: RIPE # Filtered
>
> person: Admin Tehila
> address: Israel Ministry Of Finance
> address: 1 Netanel Lorech st
> address: Jerusalem Israel
> phone: +972 2 6664666
> fax-no: +972 2 6664650
> remarks: For ABUSE and security issues please contact
> remarks: email: [email protected]
> remarks: or contact CERT.gov.il at [email protected]
> nic-hdl: AT979-RIPE
> source: RIPE # Filtered
>
> Regards,
> --
> -Chuck
>
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