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 is a simple test program for the library. It can be  used  to  compose  and
 transmit  network  datagrams  as  a Unix-style filter (e.g. reading from or
 writing  to  files  and  pipes)  or  modify  the   local   system   network
 configuration   (including   the   ARP  cache,  firewall  ruleset,  network
 interfaces, and routing table).  Convert the (specified as a  hostname,  IP
 address, or MAC address) into its binary representation on standard output.
 Convert the C-style escaped  (shellcode,  for  instance)  into  its  binary
 representation  on  standard output. Write random bytes to standard output.
 Prepend the data read from  standard  input  with  an  Ethernet  header  on
 standard  output.  The  Ethernet may be specified as or as a hex, octal, or
 decimal number.  Prepend the data read from  standard  input  with  an  ARP
 header  on standard output. The ARP may be specified as or as a hex, octal,
 or decimal number.  Prepend the data read from standard input  with  an  IP
 header  on standard output. The fragmentation may be specified as a decimal
 number (optionally concatenated with to indicate more fragments)  or  as  a
 hex  number.  The  may be specified by name, or as a hex, octal, or decimal
 number.  Prepend the data read from standard input with an ICMP  header  on
 standard  output.   Prepend  the  data  read from standard input with a TCP
 header on standard output. A may be specified by name  or  hex,  octal,  or
 decimal  number.  The  TCP  may  be  specified  as  some combination of the
 characters in the set or as a hex  number.   Prepend  the  data  read  from
 standard  input with a UDP header on standard output. A may be specified by
 name or hex, octal, or decimal number.  Read a packet from  standard  input
 and  send it over the network. If no is specified, the packet is assumed to
 be an IP datagram and routed to its destination. Otherwise, the  packet  is
 assumed  to  be  an  Ethernet  frame  and  is  transmitted on the specified
 interface.  Display the kernel ARP cache.  Display the kernel ARP entry for
 Add  an  ARP entry mapping the address for Delete the ARP entry for Display
 the kernel firewall ruleset.  Add a rule to  or  delete  a  rule  from  the
 active firewall ruleset. The must be either or The direction must be either
 or The may specify an interface name, or The may be specified by  name,  or
 as  a  decimal number. For TCP and UDP protocols, a (or range, if specified
 with a value) may be specified in decimal and appended to the source and/or
 destination address. For ICMP, a (and optional may be specified in decimal.
 Display  the  configuration  of  all  network  interfaces.    Display   the
 configuration  for  the  interface  specified  by  Configure  the interface
 specified by Display the kernel routing table.  Display the route  for  the
 destination  specified as a hostname, IP address, or network prefix in CIDR
 notation.  Add a route for the destination through the gateway  Delete  the
 route  for the destination Send a UDP datagram containing random shellcode:
 dnet     hex      "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89"      \
 "\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80"                \
 "\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff/bin/sh"  |  \  dnet   udp
 sport  555  dport  666 | \ dnet ip proto udp src 1.2.3.4 dst 5.6.7.8 | dnet
 send Save an ARP request in a file and send it twice: dnet arp op  req  sha
 0:d:e:a:d:0 spa 10.0.0.3 tpa 10.0.0.4 | \ dnet eth type arp src 0:d:e:a:d:0
 dst ff:ff:ff:ff:ff:ff > arp.pkt dnet send fxp0 < arp.pkt dnet send  fxp0  <
 arp.pkt Send a fragmented ping packet: # Create ping packet with IP header,
 to set ICMP checksum echo "monkey monkey monkey monkey" | dnet icmp type  8
 code 0 | \ dnet ip proto icmp src 1.2.3.4 dst 5.6.7.8 > ping.pkt

 # Chop off IP header dd if=ping.pkt of=ping.data bs=20 skip=1

 # Fragment IP payload split -b 24 ping.data p.

 # Send fragments dnet ip id 1 off 0+ proto icmp src 1.2.3.4 dst  5.6.7.8  <
 p.aa | \ dnet send dnet ip id 1 off 24 proto icmp src 1.2.3.4 dst 5.6.7.8 <
 p.ab | \ dnet send Dug Song