Re: Is this possible SYN Proxy bug?

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Hi Ibrahim,

On 6/24/19 9:55 AM, İbrahim Ercan wrote:
> On Fri, Jun 21, 2019 at 2:10 PM Florian Westphal <fw@xxxxxxxxx> wrote:
>>
>> Yes, something like this is needed, i.e. we need to pass two
>> mss values -- one from info->mss ("server") that we need to
>> place in the tcp options sent to client and one containing
>> the clients mss that we should encode into the cookie.
>>
>> I think you can pass "u16 client_mssinfo" instead of u16* pointer.
> 
> Hi Florian.
> 
> We tested fixed code on real environment and we are still getting some
> errors. We have a customer using syn proxy in front of a point of sale
> (POS) application and they reported that about %0.4 of connections are
> erroneous.
> When I examine traffic from pcap file, I saw connections opens
> successfully but somehow something goes wrong after then.
> If we deactivates syn proxy, problem goes away. So we are sure it is
> caused by syn proxy.
> How can I debug syn proxy further? Do you have any suggestion?
> 
> Regards.
> 

I am working on synproxy right now, I am going to test it in different
environments and debug it. Please let me know if you have any
recommended environment on mind.

Thanks,
Fernando.



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