Dear Bram
You may need to describe your intention more clearly.
If you detach the network cable, the hardware will detect the disconnect
and reset the hardware, which will provide an indicate to the higher
layers to reset also. Reconnecting the cable will be seen as a new
connection and it will perform initialisation (eg DHCP, etc). All TCP
connections will be closed, etc.
If it is the case that you are trying to test behaviour of an
application to the effects of loss of packets then you will need a
different approach.
We use the IPFW firewall and set up pipes that can be configured to
artificially lose packets, restrict BW or even close (hence my question
to the group). Alternatively you must arrange to break the connection
elsewhere, say on the otherside of a switch, taking care not to break
the physical connetion to the far end to create a disconnect that does
not reset the hardware..
Regards
Malcolm
Nikos Vassiliadis wrote:
On Wednesday 07 November 2007 18:02:44 Bram wrote:
Hi all,
Can you change the timeout for a tcp connection ?
I need to do the following: start a tcp connection , unplug the network
cable (it's actually wifi but the effect is the same),send some data
over the connection,wait 20 seconds , reinsert the network cable and
just keep working.
When you normally do this the connection will be dead.
Is there a way in freebsd to change this ? are there parameters wich you
can set so that the above would work (20 seconds without network can
happen) ?
TCP using the default FreeBSD settings, can survive
20 secs of inactivity. It can be an application forced
timeout. What application/protocol are talking about?
Nikos
_______________________________________________
freebsd-questions@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-questions
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
--
---------------------------------------------------
Dr Malcolm Clarke
Senior Lecturer in Data Communication Systems and Telemedicine
Department of Information Systems and Computing
Brunel University
Uxbridge
Middlesex
UB8 3PH
UK
Tel: +44 1895 265053
Fax: +44 1895 251686
http://www.brunel.ac.uk/about/acad/siscm/research/themes/is/groups/bright/people
----------------------------------------------------
_______________________________________________
freebsd-questions@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-questions
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
