IPPF_HOPLIMIT
ipp->ipp_fields &= ~IPPF_HOPLIMIT;
ipp->ipp_fields |= IPPF_HOPLIMIT;
ipp->ipp_fields |= IPPF_HOPLIMIT | IPPF_TCLASS | IPPF_ADDR;
ipp->ipp_fields |= IPPF_HOPLIMIT | IPPF_TCLASS | IPPF_ADDR;
if (ipp->ipp_fields & IPPF_HOPLIMIT)