ifconfig: SIOCIFCREATE2: Invalid argument

9.0-RELEASE-p1 # Custom kernel

/usr/src/sys/i386/conf/CUSTOM
Code:
include GENERIC
ident CUSTOM
cpu I686_CPU
nooptions SCTP
options VIMAGE
device epair
options NULLFS
device pf
device pflog
device pfsync
options ALTQ
options ALTQ_CBQ
options ALTQ_RED
options ALTQ_RIO
options ALTQ_HFSC
options ALTQ_PRIQ
options ALTQ_NOPCC

At times when I try to create a bridge or epair device I get
Code:
# ifconfig epair create
ifconfig: SIOCIFCREATE2: Invalid argument

When I reboot I can create them and later it fails for either or both bridge and epair devices.

I found an article on http://lifanov.com/doc/vimage.html that allowed me to set up networking using epair devices. When I got to the hierarchical steps, the ifconfig created bridge0, but when trying to create epair it failed with the SIOCFCREATE2.
 
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