/// If the source route is incomplete, then the Strict Source Route bit is checked.
/// If the source route is a strict source route and the next IP destination or autonomous system is NOT an adjacent system, the packet MUST be dropped.
/// The offset field indicates the octet offset from the start of the Routing field to the first octet of the active Source Route Entry to be examined.
/// This field is present if the Routing Present or the Checksum Present bit is set to 1, and contains valid information only if the Routing Present bit is set to 1.