IGMP header

The following fields are defined for the IGMP header, as described in [RFC2236]:

$$\begin{tabular}{l\vert cccccccccccccccccccccccccccccccc\vert... ...{32}{c\vert}{{\tt igmp\_group}} \\ \cline{2-33} \end{tabular}$$

Because field names generally follow the corresponding naming conventions used in BSD /usr/include/netinet/ include files, the ``Max Response Time'' field is called igmp_code (for ``routing code'').

Note that igmp_group is of type ``IPv4 address''.

All fields listed above are based on igmp_hdr, which in turn is defined as follows:

field igmp_hdr = ip_nexthdr if ip_proto == IPPROTO_IGMP;