On Tue, May 19, 2009 at 01:03:40PM -0700, Philip Guenther wrote:
> On Tue, May 19, 2009 at 11:51 AM, Fortunato
> <[email protected]> wrote:
> ...
> > Is there a way to set the flags to PROMISC for an interface?
>
> What problem are you trying to solve?
Although not the original poster, and this is not his problem, I had a
need to set an interface to PROMISC and I used tcpdump fxp0 host 1.1.1.1
to accomplish it which seemed a kludge.
I was testing some point to mulit-point wireless bridges. We ended up
being able to load test 7 clients from one laptop, and could scale it
further but ran out of places to mount the client equipment.
Setup is like this:
Iperf endpoint & DHCP server
Switch
AP
Wireless Links
Multiple Clients
Switch (with vlans)
OpenBSD Laptop to Trunk port on switch
So, I did something like this to create vlans for the number of clients I
want to test:
local _count=3
local _start=1
for _v in `jot $_count $(( $_start + 100 ))`; do
echo Start vlan$_v
_lladdr="lladdr 00:11:22`echo $_v | sed -e 's/\(.\)/:0\1/g'`"
ifconfig vlan$_v vlandev $_vlandev $_lladdr
dhclient vlan$_v &
done
The lladdr change is because the DHCP server will not hand out multiple
addresses if the vlans have the same MAC.
The switch with vlans is configured as such:
interface FastEthernet0/1
switchport access vlan 101
!
interface FastEthernet0/2
switchport access vlan 102
!
...
!
interface GigabitEthernet0/1
switchport mode trunk
!
The laptop is plugged into the gigabit port on the switch, the different
pieces of client equipment are plugged into the different FastEthernet
ports.
Then I run iperf simultaneously, bound to each vlan with an IP.
#!/bin/sh
local _host=iperf.server
for _int in `ifconfig vlan 2>/dev/null |
awk '/^vlan/ { sub(":","",$1); print $1 }' |
sort`; do
local _ip=`ifconfig $_int | awk '/inet / { print $2 }'`
local _last=`echo $_int | sed -e 's/^.*\(..\)$/\1/'`
local _port=$(( $_last + 5000 ))
if [ ! -z $_ip ]; then
iperf -B $_ip -p $_port -c $_host $@ | {
local _line
while read _line; do
echo $_int: $_line
done
} &
fi
done
wait
l8rZ,
--
andrew - ICQ# 253198 - Jabber: [email protected]
BOFH excuse of the day: A plumber is needed, the network drain is
clogged
