05-14-2009
Hi everyone,
I have the exact same problem with two of my servers running on SCO 5.0.5.
The first one is part of a tiny network (about 6 or 7 'clients') so I don't think the number of TCP connections is the reason. Thanks to your previous posts, we are about to install a packet sniffer on the network.
The problem is that I'm not really a network expert (and my native language is french) so I'm a bit lost in all the information the sniffer will give to me. What am I supposed to search for ? Gratuitous ARP Requests ? I've read that those requests are sent to check for double IP, is it true ?
Thanks in advance
edit : I'm trying to install tcpdump on my server. When I try to launch it, I have en error message : "no cards available to use in /dev/mdi". And when I try to give him the interface I want, it says "Can't open device - Device busy". Do I need to install a second card on the server ?
Last edited by ajacques; 05-14-2009 at 06:49 AM..
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SET_NET_DEFAULT(8) System Manager's Manual SET_NET_DEFAULT(8)
NAME
s_n_d, set_net_default - select the default TCP/IP network
SYNOPSIS
set_net_default: not found
DESCRIPTION
This manual page is here because so many others refer to it. The set_net_default command does not exist under standard Minix, because the
TCP/IP server only supports one network. The server under Minix-vmd supports four different networks, that can each be chosen as the
default network.
The TCP/IP library and commands do have a notion about a "default network" however, because the code is shared between the Minix versions.
So if you want to venture into network programming then you should know about the devices and environment variables mentioned below to make
your program compatible. (Especially since there is a plan to upgrade the TCP/IP server for standard Minix.)
Options and environment to change the default
Many TCP/IP programs implement the following options and environment variables to change the default devices set by set_net_default. The
options are only implemented for low level programs where it makes sense to name a network device. The environment variables are used in
all code. You can run a process and all its children connected to a different network by setting four environment variables.
ETH_DEVICE=device
-E device
Device to use as raw ethernet device instead of the default /dev/eth.
PSIP_DEVICE=device
-P device
Pseudo IP device to use instead of /dev/psip.
IP_DEVICE=device
-I device
IP device to use instead of /dev/ip.
TCP_DEVICE=device
-T device
TCP device to use.
UDP_DEVICE=device
-U device
UDP device to use.
FILES
/dev/eth[01] First and second raw ethernet.
/dev/psip[01] First and second Pseudo IP network.
/dev/ip[0123] IP devices for two ethernets and two Pseudo IP networks.
/dev/tcp[0123] TCP devices for same four networks.
/dev/udp[0123] UDP devices.
/dev/eth, /dev/psip, /dev/ip, /dev/tcp, /dev/udp
Devices for the default network, links to the devices above. Eth is only present if ethernet is the default, psip only
for pseudo IP.
SEE ALSO
ip(4), boot(8).
AUTHOR
Kees J. Bot (kjb@cs.vu.nl)
SET_NET_DEFAULT(8)