Alwyn Goodloe wrote:
>
> Guys still having problems with divert sockets and fragmentation.
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the "defrag all" feature of Linux solves the discussed problem, but can be
improved. We do not need to defrag the packets. We just need to queue them.
and, when the first frag has been received, we only need to save the
informations necessary for filtering (ip header stuff + ports for TCP/UDP and
On Fri, Jan 26, 2001 at 09:00:54PM +0100, mouss wrote:
> "IP filtering engines" that do something to packet based on rule
> matching have a problem when fragmentation comes to play.
>
> In the case of a "packet redirector' such as divert, the problem is that
> only the first fragment will match t
"IP filtering engines" that do something to packet based on rule
matching have a problem when fragmentation comes to play.
In the case of a "packet redirector' such as divert, the problem is that
only the first fragment will match the rule, if the rule uses ports or
whatever info contained in the
Alwyn Goodloe writes:
> Guys still having problems with divert sockets and fragmentation.
>
> As I said in a previous post the divert operations and corresponding program
> work fine when the datagram sent have size < MTU (1500) but when the
> datagram has size > MTU and hence get fragmented
Having run lsof I can verify that the program IS reading on that port
number.
Has anyone else on the hacker list had problems with diverting
fragmented datagrams??
Alwyn Goodloe
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On Fri, 26 Jan 2001, Patrick Bihan-Faou wrote:
> Hi,
>
> Sorry to state something that is
Thanks for the suggestion I will give lsof a shot to see.
I think the port binding is correct, otherwise I don't think it would
work when datagrams aren't fragmented. Like I said the code works fine
for datagrams < MTU ==> not fragmented but fails when they are. That being
said it NEVER HUR
Hi,
Sorry to state something that is obvious, but when you bind your socket to
the port, you have the port in the correct (network) order ?
i.e. do you use htons(DIVERTPort) ?
If you have lsof installed, run it and look at the port number that your
program listens on.
Patrick.
> Here is th
Guys still having problems with divert sockets and fragmentation.
As I said in a previous post the divert operations and corresponding program
work fine when the datagram sent have size < MTU (1500) but when the
datagram has size > MTU and hence get fragmented the recfrom just
waits never rec
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