<s>
Bit-Twist	B-Protocol
is	O
a	O
libpcap-based	O
packet	B-Protocol
generator	I-Protocol
and	O
packet	B-Protocol
capture	I-Protocol
file	O
modifier	O
and	O
replayer	O
.	O
</s>
<s>
It	O
complements	O
tcpdump	B-Protocol
,	O
a	O
packet	B-Protocol
capturing	I-Protocol
tool	O
also	O
built	O
upon	O
the	O
packet	B-Protocol
capturing	I-Protocol
engine	O
libpcap	B-Language
.	O
</s>
<s>
Bit-Twist	B-Protocol
allows	O
you	O
to	O
regenerate	O
packets	O
from	O
one	O
or	O
more	O
pcap	B-Language
files	O
.	O
</s>
<s>
It	O
also	O
comes	O
with	O
a	O
comprehensive	O
pcap	B-Language
file	O
editor	O
to	O
allow	O
advance	O
manipulation	O
of	O
packet	O
information	O
,	O
e.g.	O
</s>
<s>
fields	O
in	O
Ethernet	O
,	O
ARP	O
,	O
IP	B-Protocol
,	O
ICMP	B-Protocol
,	O
TCP	B-Protocol
,	O
and	O
UDP	B-Protocol
headers	O
,	O
prior	O
to	O
regenerating	O
the	O
packets	O
onto	O
the	O
network	O
.	O
</s>
<s>
Bit-Twist	B-Protocol
is	O
commonly	O
used	O
to	O
simulate	O
network	O
traffic	O
to	O
test	O
firewall	B-Application
rules	O
,	O
IDS	O
,	O
and	O
IPS	O
.	O
</s>
<s>
Bit-Twist	B-Protocol
runs	O
on	O
FreeBSD	B-Operating_System
,	O
NetBSD	B-Device
,	O
OpenBSD	B-Operating_System
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
Linux	B-Application
,	O
and	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
