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On Thu, Apr 22, 2004 at 05:50:57PM -0700, David Yeske wrote:
I'm in a situation where I need to emulate multiple ethernet devices with
different mac addresses. I have gotten far enough to have this.
I ran ngctl and then ran
mkpeer . eiface hook ether
I then ran
ifconfig ngeth0 link '00:bd:03:11:21:11'
ifconfig ngeth0 192.168.20.5
ifconfig sis0 192.168.23.45
So basically I want to be able to ping / connect to
192.168.20.5 from another box on the 192.168.23.0/24 network, and have it see
the mac address that I have set rather than the mac address of my sis0 device.
I know I can do this with vmware, but I am trying to avoid that.
Anyone know if this is possible? Is there a way to do this with the tap device
and or arpd?
Using Netgraph, you can emulate any number of Ethernet interfaces
on one physical interface. Here's my recipe for you:
1. Load the ng_ether(4) module.
2. Create the required number of ng_eiface(4) nodes.
3. Connect lower and upper of sis0: and all ngethX:
ng_ether(4) nodes to one ng_bridge(4).
4. Make sure to ngctl msg if: setautosrc 0 to all
ng_ether(4) nodes.
5. Optionally set net.link.ether.inet.log_arp_wrong_iface=0.
Here's my test (I've omitted obvious configuration steps):
# ifconfig dc0 ether
dc0: flags=8843UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST mtu 1500
options=48VLAN_MTU,POLLING
ether 00:10:a4:c0:c0:45
# ifconfig ngeth0
ngeth0: flags=8843UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST mtu 1500
ether 00:00:00:01:02:03
# ngctl show bridge:
Name: bridge Type: bridge ID: 000b Num hooks: 4
Local hook Peer name Peer typePeer ID Peer hook
-- - ---- -
link4 ngeth0 ether0007lower
link3 ngeth0 ether0007upper
link2 dc0 ether0002lower
link1 dc0 ether0002upper
# ifconfig ngeth0 1.2.3.4
# tcpdump -lenx -i dc0 ether host 0:0:0:1:2:3
tcpdump: listening on dc0
20:29:05.571179 0:0:0:1:2:3 ff:ff:ff:ff:ff:ff 0806 42: arp who-has 1.2.3.4 tell 1.2.3.4
0001 0800 0604 0001 0001 0203 0102
0304 0102 0304
Cheers,
--
Ruslan Ermilov
[EMAIL PROTECTED]
FreeBSD committer
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