} else if proto == 0x60 {
    dstIP = net.IP(packet[24:40])
    if node.cfg.BuiltinAddr6.Equal(dstIP) {
        continue
    } else if serviceNet.NetworkRange.Contains(dstIP) {
        // Are you TCP because your protocol is 6, or is your
        // protocol 6 because you are TCP?
        if packet[6] == 0x06 {
            port := uint16(packet[42])*256 + uint16(packet[43])
            if serviceNet.EnsureListener([16]byte(packet[24:40]), port) {
                count, err := (*serviceNet.Tun).Write([][]byte{packet}, 0)
                if count == 0 || err != nil {
                    logger.With(err).Error("Error writing to service-network tunnel")
                }
            }
        }
        continue
    }
}
...
// Check route table for destination address.
route, found := node.cfg.FindRouteForIP(dstIP)
if found {
    dst = route.Target.ID
    go node.sendPacket(dst, packet, plen)
}