Re: disable TCP from NetBSD

Hi,

I though the kernel does not pass any TCP fragment to an application using
raw sockets in any cases... So, I thought I cannot use raw socket in case I
point IPPROTO_TCP for socket call. Very interesting situation how the kernel
controls such cases...

Ok, I will try to write a simple example. Thanks you very much for
clarification.

2009/3/23 Nikos Balkanas <[email protected]>

>  Hi,
>
> You can still work with raw sockets, therefore rewriting your IP packets -
> useful and advanced network programming, without bypassing your kernel. If
> you do (bypass it) there is a whole lot of userspace applications that
> depend on it, and I am afraid you may end up with a useless system.
>
> Good luck,
> Nikos
>
> ----- Original Message -----
> *From:* Alexander Bubnov <[email protected]>
> *To:* Nikos Balkanas <[email protected]>
> *Cc:* [email protected]
> *Sent:* Monday, March 23, 2009 9:11 AM
> *Subject:* Re: disable TCP from NetBSD
>
> Thanks you for replay, Nikos!
>
> Most probably you are right that I am not in right direction... I just
> would like to write a simple implementation of TCP layer of TCP/IP stack.
> For this purpose I need IP layer to get IP PDU (packets) with help of raw
> socket. Now, I cannot use socket interface as the kernel caught all TCP
> fragments. even I cannot receive TCP PDU using bpf from other peers because
> the kernel sends RST as it thinks there are not listeners.
>
> I though TCP layer can be easily separated off from the kernel. But, as far
> as I understand only whole TCP/IP stack can be turned off because all the
> layers have strong dependencies from each other beginning at NIC drivers.
>
> 2009/3/23 Nikos Balkanas <[email protected]>
>
>>  Hi,
>>
>> What are you trying to do? It doesn't seem you are in the right direction.
>> All IP traffic should and will go through the kernel. I presume you are not
>> redeveloping your NIC drivers.
>>
>> BR,
>> Nikos
>>
>>  ----- Original Message -----
>> *From:* Alexander Bubnov <[email protected]>
>> *To:* [email protected]
>> *Sent:* Sunday, March 22, 2009 7:05 PM
>> *Subject:* disable TCP from NetBSD
>>
>> Hello, all! I am going to practice in net programming by writing TCP
>> protocol. Can you please let me know how to disable TCP from NetBSD because
>> as I guess all tcp packets will be catched by kernel? Unfortunately, I have
>> not found the way in manual about sysctl and GENERIC conf file for kernel,
>> just "options INET" which turn off IP + ICMP + TCP.
>>
>> Thanks in advance.
>>
>> --
>> /BR, Alexander
>>
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>
>
> --
> /BR, Alexander
>
>


-- 
/BR, Alexander

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easily build your RIAs with Flex Builder, the Eclipse(TM)based development
software that enables intelligent coding and step-through debugging.
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