flag = {
    name        = enet-dmac;
    arg-type    = string;
    max         = 1;
    descrip     = "Override destination ethernet MAC addresses";
    doc         = <<- EOText
Takes a pair of comma deliminated ethernet MAC addresses which
will replace the destination MAC address of outbound packets.
The first MAC address will be used for the server to client traffic
and the optional second MAC address will be used for the client
to server traffic.

Example:
@example
--enet-dmac=00:12:13:14:15:16,00:22:33:44:55:66
@end example
EOText;
};


flag = {
    name        = enet-smac;
    arg-type    = string;
    max         = 1;
    descrip     = "Override source ethernet MAC addresses";
    doc         = <<- EOText
Takes a pair of comma deliminated ethernet MAC addresses which
will replace the source MAC address of outbound packets.
The first MAC address will be used for the server to client traffic
and the optional second MAC address will be used for the client 
to server traffic.

Example:
@example
--enet-smac=00:12:13:14:15:16,00:22:33:44:55:66
@end example
EOText;
};

flag = {
  name     = enet-subsmac;
  arg-type = string;
  max      = 9999;
  stack-arg;
  descrip  = "Substitute MAC addresses";
  doc      = <<- EOText
Allows you to rewrite ethernet MAC addresses of packets. It takes
comma delimited pair or MACs address and rewrites all occurrences of
the first MAC with the value of the second MAC.
Example:
@example
--enet-subsmac=00:12:13:14:15:16,00:22:33:44:55:66
@end example
EOText;
};

flag = {
  name        = enet-mac-seed;
  arg-type    = number;
  max         = 1;
  flags-cant  = enet-smac;
  flags-cant  = enet-dmac;
  flags-cant  = enet-subsmac;
  descrip     = "Randomize MAC addresses";
  doc         = <<- EOText
Allows you to randomize ethernet MAC addresses of packets, mostly
like what @var{--seed} option does for IPv4/IPv6 addresses.
EOText;
};

flag = {
  name         = enet-mac-seed-keep-bytes;
  arg-type     = number;
  arg-range    = "1->6";
  flags-must   = enet-mac-seed;
  max       = 1;
  descrip   = "Randomize MAC addresses";
  doc       = <<- EOText
Keep some bytes untouched when usinging @var{--enet-mac-seed} option.
EOText;
};

/* rewrite 802.1q vlan tags */
flag = {
    name        = enet-vlan;
    max         = 1;
    descrip     = "Specify ethernet 802.1q VLAN tag mode";
    arg-type    = string;
    doc         = <<- EOText
Allows you to rewrite ethernet frames to add a 802.1q header to standard 802.3
ethernet headers or remove the 802.1q VLAN tag information.
@table @bullet
@item
@var{add}
Adds an 802.1q VLAN header to the existing 802.3 ethernet header. If
a VLAN header already exists, a new VLAN header is added outside of the
existing header.

Note that you will be allowed to run this option multiple times to create
more than 2 VLAN headers, however those packets will be valid. At most
you should have 2 X 802.1q VLAN tags, or outer an 802.1ad and an inner 802.1q
VLAN tag.
@item
@var{del}
Rewrites the existing 802.1q VLAN header as an 802.3 ethernet header
EOText;
};

flag = {
    name        = enet-vlan-tag;
    max         = 1;
    descrip     = "Specify the new ethernet 802.1q VLAN tag value";
    arg-type    = number;
    flags-must  = enet-vlan;
    arg-range   = "0->4095"; /* VID's are 12bit unsigned int's */
    doc         = "";
};

flag = {
    name        = enet-vlan-cfi;
    max         = 1;
    descrip     = "Specify the ethernet 802.1q VLAN CFI value";
    arg-type    = number;
    flags-must  = enet-vlan;
    arg-range   = "0->1"; /* one bit */
    doc         = "";
};

flag = {
    name        = enet-vlan-pri;
    max         = 1;
    descrip     = "Specify the ethernet 802.1q VLAN priority";
    flags-must  = enet-vlan;
    arg-type    = number;
    arg-range   = "0->7"; /* one byte */
    doc         = "";
};

flag = {
    name        = enet-vlan-proto;
    max         = 1;
    flag-must   = enet-vlan;
    descrip     = "Specify VLAN tag protocol 802.1q or 802.1ad";
    arg-type    = string;
    doc         = <<- EOText
Allows you to specify the protocol of the added VLAN tags.
@table @bullet
@item
@var{802.1q}
Specifies that 802.1q VLAN headers are to be added. This is the default.
@item
@var{802.1ad}
Specifies that 802.1ad Q-in-Q VLAN headers are to be added. To make valid packets,
input packets must already have 802.1q VLAN headers.
EOText;
};