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Tcp: responding to a server's acknowledgment

D

deostroll

#1
Hi,

I am not that experienced with tcp programming. Lately I am trying to
understand how I can respond to server acknowledgements. I guess they come
into picture only if you send some IAC DO instructions to the server. I am
not sure though. I have posted a full account of my problem over @ msdn
forums. Not got a response so far. Below is the link to it:
http://social.msdn.microsoft.com/Fo...m/thread/1693020a-0e17-40b5-8868-53df02228eae

Hoping I can find some advice. Thanx in advance.

--deostroll
 

My Computer

G

Goran Sliskovic

#2
Re: responding to a server's acknowledgment

"deostroll" <deostroll@newsgroup> wrote in message
news:0FC80D24-DC75-4E8A-9476-891FA26E5B74@newsgroup

> Hi,
>
> I am not that experienced with tcp programming. Lately I am trying to
> understand how I can respond to server acknowledgements. I guess they come
> into picture only if you send some IAC DO instructions to the server. I am
> not sure though. I have posted a full account of my problem over @ msdn
> forums. Not got a response so far. Below is the link to it:
> http://social.msdn.microsoft.com/Fo...m/thread/1693020a-0e17-40b5-8868-53df02228eae
>
> Hoping I can find some advice. Thanx in advance.
>
> --deostroll
The acknowledgment you are talking about is internal to TCP protocol. It's
not passed to an application and the application does not need to respond to
it (it can't). OS will handle that. Your problem is somwhere in the
implementation of telnet protocol.

Regards,
Goran
 

My Computer

D

deostroll

#3
Re: responding to a server's acknowledgment

> Your problem is somwhere in the

> implementation of telnet protocol.
> Goran
So how do I implement it? I hope u see there is a challenge here. I
don't exactly understand what I have to send to the remote machine via
telnet. I have to keep discovering that using the wireshark tool...

--deostroll
 

My Computer

G

Goran Sliskovic

#4
Re: responding to a server's acknowledgment

"deostroll" <deostroll@newsgroup> wrote in message
news:0012f052-5e15-47b6-a736-f0dbdd90787b@newsgroup

>> Your problem is somwhere in the
>> implementation of telnet protocol.
>> Goran
>
> So how do I implement it? I hope u see there is a challenge here. I
> don't exactly understand what I have to send to the remote machine via
> telnet. I have to keep discovering that using the wireshark tool...
>
> --deostroll
Telnet protocol is specified in:
http://www.faqs.org/rfcs/rfc854.html

There are probably lot resources on the internet about telnet protocol.
Reverse engineering using wireshark is a bit tricky and unnecessary IMHO.

Regards,
Goran
 

My Computer

G

Goran Sliskovic

#6
Re: responding to a server's acknowledgment

"deostroll" <deostroll@newsgroup> wrote in message
news:08d31853-51f2-4067-99a7-5df6cc340f72@newsgroup

>> Telnet protocol is specified in:http://www.faqs.org/rfcs/rfc854.html
>> Goran
>
> I still can't develop a NVT just by reading that...are there any texts/
> books which explain how to go about implementing it...?
>
> --deostroll
Shouldn't be so difficult, you probably could implement only few options and
refuse most... Anyway, there are lot of free telnet clients with source code
available on the internet:

http://www.google.hr/search?q=telnet+client+source

Regards,
Goran
 

My Computer

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