interface bonding
Richard Bejtlich
richard_bejtlich at yahoo.com
Wed Jan 21 13:38:35 PST 2004
Hello,
On 9 Jan 04 I posted a method for bonding interfaces
using netgraph for purposes of sniffing tap outputs as
a single virtual interface. Unfortunately, the method
I posted creates two copies of every packet.
I have used the following to successfully collect only
one copy of packets sent from the two TX streams of a
network tap:
#!/bin/sh
# sf2 and sf3 are real interfaces which receive tap
# outputs; ngeth0 is created by ngctl
# ng_ether must be loaded so netgraph can "see" the
# real interfaces sf2 and sf3
kldload ng_ether
# bring up the real interfaces
ifconfig sf2 promisc -arp up
ifconfig sf3 promisc -arp up
# create ngeth0 and bind sf2 and sf3 to it
ngctl mkpeer . eiface hook ether
ngctl mkpeer ngeth0: one2many lower one
ngctl connect sf2: ngeth0:lower lower many0
ngctl connect sf3: ngeth0:lower lower many1
# bring up ngeth0 for sniffing duties
ifconfig ngeth0 -arp up
--
Sorry for the confusion earlier. I appreciate any
comments on how to improve this method. Please check
my 9 Jan post to see the setup which created the dual
packets.
Sincerely,
Richard Bejtlich
http://www.taosecurity.com
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