GIF_NOCLAMP
DEF_CMD("noclamp", GIF_NOCLAMP, setgifopts),
DEF_CMD("-noclamp", -GIF_NOCLAMP, setgifopts),
#define GIF_OPTMASK (GIF_NOCLAMP|GIF_IGNORE_SOURCE)
if ((options & GIF_NOCLAMP) !=
(sc->gif_options & GIF_NOCLAMP)) {
mtu = ((sc->gif_options & GIF_NOCLAMP) == 0) ? IPV6_MINMTU : 0;